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Engine overheating my bike's engine is overheating or is it normal? i have a 150cc bike with 10.6:1 compression ratio. what option do i have to prevent my bike from overheating. thx in advance.

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What model/type is your bike?
Is it water or air cooled?
Does it have a cooling fan?
Does it overheat when in motion or only in very slow traffic?
What indication do you have that it's overheating?

The solution will depend on the answer to these questions.

Posted on Nov 09, 2013

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I have a pulsar 220f recently my engine is seeze coz of overheating... I give that for mechanic and he done overhaul.... But still I face the overheating problem... Plz help me...,

Posted on May 24, 2015

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Yamaha VMAX 1200 how to do a compression test


Hi, Daniel to perform a proper compression test you need a pressure gauge either threaded or push in. You will get a higher more accurate reading when the engine is at normal operating temperature along with burnt fingers if you are not protected or careful, cold testing works just fine and it's the method I use 99% of the time. If your bike has cams and valves you need to make sure your valve clearance is within book specs. Always blow forced air around the spark plug before you remove it to eliminate any uninvited contamination from getting inside the cylinder. Install the compression gauge, twist the throttle grip to the wide open position and kick or hit the starter button long enough for the engine to turn over 5-6 times. Record the reading and repeat the process 3 times to get the average reading. Single cylinder engines must have a minimum of 100 PSI anything less call a Priest for Last Rites, it's time for a top end overhaul. Multi-cylinder engines must have no more than a 10% difference between each cylinder, for you high- performance ******* no more than 10 lbs. per cylinder. To run on today's fuel most bikes have pistons with compression ratio's designed to give acceptable performance using an 87 octane graded fuel, this means the average compression readings on most bikes will be 125-150 PSI. I have gotten readings of 200+ on some big inch V-Twins and Thumpers but these numbers are rare and require high octane fuel to eliminate cylinder ringing or pinging.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Cylinder Compression Test VMaxForum net
Yamaha Max 600 Engine Running and Compression test
Yamaha VMX12H Supplementary Service Manual
https://www.partsfish.com/page/oem-parts-for-yamaha
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Apr 11, 2018 | Yamaha Motorcycles

1 Answer

2001 pontiac bonneville sse super charge engian what typ of gas to put in


the higher the compression ratio the higher the octane rating required
normal compression ratio 10 or 11:1 will run on 91 or 95 octane rating
higher will require 100-110 octane rating or aircraft engine gas
superchargers only increase the amount of air available for combustion
it is the compression ratio that determines the octane rating required

Nov 13, 2017 | 2001 Pontiac Bonneville

1 Answer

Hi, I have a 2009 Husqvarna TE 250, spec states the engine as 12.9:1 compression ratio. The question I have, is what octane fuel rating is recommended for this bike? Thanks, Rob


91 or 95 octane is suitable for 9.5-10.5 ratios ( most engines)
for 12.9 you will find that it runs best on 98 octane
it may be good on 95 octane but generally the higher the compression ratio the higher octane rating
discuss the octane rating required with the bike service agent/service center

Apr 02, 2017 | Cars & Trucks

1 Answer

I've a Pulsar 150cc bike bought in may 2009, roamed around 70k kms. Problem is it is exhausting white smoke only when it is started, mechanic at a Bajaj showroom says it has come to bore and had to be...


Hi, if the smoke really is white smoke and is only present when you start then it COULD be just water vapour which once exhausted (after warming up) would result in normal exhaust gas colour from then on.

If it is burning white smoke all the time then it could be piston ring failure. As this is a single cylinder engine you would need to find out what the normal compression reading should be and then check your reading with a compression tester. You probably don't have one but most motorcycle garages should be able to test it for you for a reasonably small fee.

From what I can find out online your compression ratio should be 9.4:1 which means your psi reading on the gauge should be around 124 psi - this may be a little lower due to engine wear.

If you can get hold of a compression tester, make sure you have the bike sized fitting on it (same thread size as your spark plug) and then warm up the engine for a few minutes then turn it off and remove the spark plug. Then fit the compression tester into the cylinder head in place of the spark plug.

Turn the engine over using the electric starter if you have one or the kick start if you don't (it wont run without the spark plug but it will turn over) and note the reading on the gauge of the compression tester. If you have a friend with a similar bike then you can check his and compare it with yours.

Regardless of the reading, now remove the tester and then put about a couple of squirts (teaspoon full max) of engine oil into the cylinder head and then repeat the compression test.

If there is a noticeable increase say 20-30 psi then I am afraid its your piston rings or valve guides which are leaking pressure, the oil temporarily sealed the leak and gave a higher reading.

BUT if the pressure is about the same then its probably not your rings and like I said earlier it could be steam caused by water vapour in the engine burning off at start up. If you smell the smoke what does it smell of?

Hope this helps,

Steve B
UK

Feb 17, 2014 | 2007 Bajaj Pulsar 150

1 Answer

2004 Honda CRF 230 F 130 psi compression cold@


Hi, Michaelhare to perform a proper compression test you need a pressure gauge either threaded or push in. You will get a higher more accurate reading when the engine is at normal operating temperature along with burnt fingers if you are not protected or careful, cold testing works just fine and it the method I use 99% of the time. If your bike has cams and valves you need to make sure your valve clearance is within book specs Always blow forced air around the spark plug before you remove it to eliminate any uninvited contamination from getting inside the cylinder. Install the compression gauge, twist the throttle grip to the wide open position and kick or hit the starter button long enough for the engine to turn over 5-6 times. Record the reading and repeat the process 3 times to get the average reading. Single cylinder engines must have a minimum of 100 PSI anything less call a Priest for Last Rites, it's time for a top end overhaul. Multi-cylinder engines must have no more than a 10% difference between each cylinder, for you high- performance ******* no more than 10 lbs. per cylinder. To run on today's fuel most bikes have pistons with compression ratio's designed to give acceptable performance using an 87 octane graded fuel, this means the average compression readings on most bikes will be 125-150 PSI. I have gotten readings of 200+ on some big inch V-Twins and Thumpers but these are rare #'s and require high octane fuel to eliminate cylinder ringing or "PING" For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
230f compression test psi
https://crfsonly.com/forum/viewtopic.php?t=29718
CRF230F service manual repair 2003 2015 CRF230 Download Manuals Technical $15
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jan 26, 2013 | 2004 Honda CRF 230 F

1 Answer

What is low compression on a 2005 kx85


Hi, David to perform a proper compression test you need a pressure gauge either threaded or push in. You will get a higher more accurate reading when the engine is at normal operating temperature along with burnt fingers if you are not protected or careful, cold testing works just fine and it's the method I use 99% of the time. If your bike has cams and valves you need to make sure your valve clearance is within book specs. Always blow forced air around the spark plug before you remove it to eliminate any uninvited contamination from getting inside the cylinder. Install the compression gauge, twist the throttle grip to the wide open position and kick or hit the starter button long enough for the engine to turn over 5-6 times. Record the reading and repeat the process 3 times to get the average reading. Single cylinder engines must have a minimum of 100 PSI anything less call a Priest for Last Rites, it's time for a top end overhaul. Multi-cylinder engines must have no more than a 10% difference between each cylinder, for you high- performance ******* no more than 10 lbs. per cylinder. To run on today's fuel most bikes have pistons with compression ratio's designed to give acceptable performance using an 87 octane graded fuel, this means the average compression readings on most bikes will be 125-150 PSI. I have gotten readings of 200+ on some big inch V-Twins and Thumpers but these numbers are rare and require high octane fuel to eliminate cylinder ringing or pinging.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://dirtrider.net/forums3/threads/compression-reading-for-kx85.155753
https://www.kawasakimotorcycle.org/forum/mechanics-corner/106903-what-compression-01-kx85-compression-test.html Kawasaki KX85 Service Manual
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Kawasaki KX85 Owner Manual

Sep 11, 2012 | 2005 kawasaki KX 85

1 Answer

1992 Yamaha XJ600 Diversion head compression number


Hi, Anonymous your bike runs a piston with a 10:1 compression ratio so your compression test should be around 160 PSI to perform a proper compression test you need a pressure gauge either threaded or push in. You will get a higher more accurate reading when the engine is at normal operating temperature along with burnt fingers if you are not protected or careful, cold testing works just fine and it the method I use 99% of the time. If your bike has cams and valves you need to make sure your valve clearance is within book specs Always blow forced air around the spark plug before you remove it to eliminate any uninvited contamination from getting inside the cylinder. Install the compression gauge, twist the throttle grip to the wide open position and kick or hit the starter button long enough for the engine to turn over 5-6 times. Record the reading and repeat the process 3 times to get the average reading. Single cylinder engines must have a minimum of 100 PSI anything less call a Priest for Last Rites, it's time for a top end overhaul. Multi-cylinder engines must have no more than a 10% difference between each cylinder, for you high- performance ******* no more than 10 lbs. per cylinder. To run on today's fuel most bikes have pistons with compression ratio's designed to give acceptable performance using 87 octane graded fuel, this means the average compression readings on most bikes will be 125-150 PSI. I have gotten readings of 200+ on some big inch V-Twins and Thumpers but these are rare #'s and require high octane fuel to eliminate cylinder ringing or "PING" For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
xj600 1992 problems
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Sep 08, 2012 | 1992 Yamaha XJ 600 Diversion S

1 Answer

2007 Honda CRF 80 F what is normal compression


Hi, Anonymous to perform a proper compression test you need a pressure gauge either threaded or push in. You will get a higher more accurate reading when the engine is at normal operating temperature along with burnt fingers if you are not protected or careful, cold testing works just fine and it's the method I use 99% of the time. If your bike has cams and valves you need to make sure your valve clearance is within book specs. Always blow forced air around the spark plug before you remove it to eliminate any uninvited contamination from getting inside the cylinder. Install the compression gauge, twist the throttle grip to the wide open position and kick or hit the starter button long enough for the engine to turn over 5-6 times. Record the reading and repeat the process 3 times to get the average reading. Single cylinder engines must have a minimum of 100 PSI anything less call a Priest for Last Rites, it's time for a top end overhaul. Multi-cylinder engines must have no more than a 10% difference between each cylinder, for you high- performance ******* no more than 10 lbs. per cylinder. To run on today's fuel most bikes have pistons with compression ratio's designed to give acceptable performance using an 87 octane graded fuel, this means the average compression readings on most bikes will be 125-150 PSI. I have gotten readings of 200+ on some big inch V-Twins and Thumpers but these numbers are rare and require high octane fuel to eliminate cylinder ringing or pinging.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
What should the compression be on xr100
https://crfsonly.com/forum/viewtopic.php?t=29718
CRF80F CRF100F service manual repair 2004 2013 CRF80 CRF100 Download... $15
https://www.partsfish.com/page/oem-parts-for-honda
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 27, 2012 | 2007 Honda CRF 80 F

1 Answer

2005 Suzuki Boulevard C90 normal cylinder compression


Hi, Anonymous to perform a proper compression test you need a pressure gauge either threaded or push in. You will get a higher more accurate reading when the engine is at normal operating temperature along with burnt fingers if you are not protected or careful, cold testing works just fine and it's the method I use 99% of the time. If your bike has cams and valves you need to make sure your valve clearance is within book specs. Always blow forced air around the spark plug before you remove it to eliminate any uninvited contamination from getting inside the cylinder. Install the compression gauge, twist the throttle grip to the wide open position and kick or hit the starter button long enough for the engine to turn over 5-6 times. Record the reading and repeat the process 3 times to get the average reading. Single cylinder engines must have a minimum of 100 PSI anything less call a Priest for Last Rites, it's time for a top end overhaul. Multi-cylinder engines must have no more than a 10% difference between each cylinder, for you high- performance ******* no more than 10 lbs. per cylinder. To run on today's fuel most bikes have pistons with compression ratio's designed to give acceptable performance using an 87 octane graded fuel, this means the average compression readings on most bikes will be 125-150 PSI. I have gotten readings of 200+ on some big inch V-Twins and Thumpers but these numbers are rare and require high octane fuel to eliminate cylinder ringing or pinging.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Suzuki Intruder VZ1500 Service Manual
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Jun 10, 2011 | 2005 Suzuki Boulevard C90

1 Answer

What should the compression be for a 1983 GS650GT, I have readings of 160 psi on three cylinders and 180 psi the other, I'm going to redo the check again with a different compression tester.


Taking compression test:- the bike's engine should be at normal running temperature and also tht the throttle should be in fully open position.
Your bike's engine has a compression ratio of 9:4:1
here is a guide frm compression ratio to psi :-
8>1 = 102.9 psi
8.5>1= 102.9 - 110.25 psi
9>1= 110.25 - 117.6 psi
9.5>1= 117.6 - 124.95 psi
10>1= 124.95 - 132.65 psi
10.5>1= 132.3 - 139.65 psi
11>1= 139.65 - 147 psi
11.5>1= 147 - 154.35 psi
12>1= 154.35 - 161.7 psi
Hope this helps!

Dec 27, 2009 | 1982 Suzuki GS 650 GT

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