Question about 1993 BMW R 100 R

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Surging while riding, terrible fuel mileage. Am going to remove carbs, clean them and check all the jets, tears in diaphrams, slides. Just ordered new floats. Any other advice for me? This is a model directly from Germany and has 40 mm bings. Thanks for any help you can offer.

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Springs for the diaghrams are crucial items too!
but usually its the diaghrams leaking ! & dont forget to rebalance the carbs
Cheers rob

Posted on Jan 05, 2010


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1 Answer

Suzuki lt50 manual

have you tried starting with the air intake pipe/hose removed from the carb ? if still wont start i'd strip carb down and clean out the jets , not forgetting the idle jet at bottom of bowl , also check the diaphram pump is in working order , rubber diaphram still flexable not holed etckeep me posted if you wish

May 26, 2014 | Cars & Trucks


Cleaning the fuel float bowl

Note: this procedure will often cure no start issues and or surging issues, or once done a little running after the fact will clear up surging issues as well.

Often gas with ethanol will cause gunk build up in the float bowl making your mower run badly and have a 'surging' behavior especially at low idle speeds, or cause it to not run at all (almost all gas has ethanol as an additive now for 'emission' reasons so assume you have it unless you KNOW you don't). This can take as little as a few weeks or a month or two of not running to happen. Frequently a simple float bowl and carb cleaning will resolve these issues completely or at least to get you back to a running point.

To clean the float bowl area, it's best to remove the carb. (make sure you pinch off gas lines with a vice grip or similar to keep it from spilling out and remove things carefully to avoid breaking seals on the intake)

Tip the carb over a catch basin or oil drip pan and turn it this way and that to pour as much excess fuel as you can. If your carb has a electric solenoid or an overflow screw on the bottom, removing this will let you pour fuel out of the bowl area.

To begin cleaning, Turn the carb upside down. Typically there are 2 or 3 screws that hold the bowl to the bottom of the carb. Do ALL of this over a nice metal tray that will catch any falling parts like small screws, carb jets, springs, plungers, etc.

Very carefully undo these screws and work the bowl until it breaks free of the seal

gently pull the bowl off the bottom of the carb. and you should see the float mechanism and main jet sticking out toward you. This visible area, all the orifices, and the bowl you removed are what you want to clean.

ANY orangish discoloration, sediment, or other gunk that is not obvious parts of the carb is bad news.. or good news because you're about to remove it and you found a problem that was worth fixing. If everything is clean, shiny, and aluminum and plastic looking, all is well in there, put it back together and move on to other DIY projects. :)

To clean it out assuming you saw at least a little orangish discoloration, a good pressurized can of carb cleaning spray is GREAT... HOWEVER, do not let carb cleaning spray get on ANY gaskets or rubber seals. The chemicals in carb cleaner will expand the rubber and make the seals not fit properly anymore and ruin them. (beware there is a TINY, impossible to see rubber seal on the plunger for the float so you MUST REMOVE THE FLOAT if you want to use carb spray to spray the metal on the carb or the jets while they are still on the carb. It may be better to just use a little gas in a metal tray and a soft toothbrush to scrub things off and clean them out. Typically it's just a pin you have to slide out in order to remove the float and plunger, it's sometimes a little tricky getting it back in just right.

You can also use your air compressor spray tool to blow out passages and dry out parts you are cleaning and it's great to blow out all the orifices you see in both directions ... BUT ... watch out because it is easy to accidentally blow out the jets and lose them! Also, wear eye protection ... seriously, do it, even if you're not using compressed air.

Once you have cleaned everything, make sure no little parts are in that handy metal tray you worked over the whole time. If there are any, find where they belong and put them back. Nothing in there is unnecessary... nothing!

Once you put it all back together, the carb will naturally refill with fuel and you should be able to start right up after a few seconds of cranking.

Any residual surging will often clear up after some run time, I like to use a little mix in gas carb cleaner after doing a carb cleaning. If my tractor has sat more than 2 months not running, I often check this before even trying to start to make sure I don't pull any gunk that did build up into the jets and clog them. Cleaning the bowl is easier than cleaning the orifices!

on Nov 15, 2013 | Garden


Carb. cleaning

gas goes bad after 30 days and after 6 months, Boy does it gum things up. i know this because, i do this for pleasure and my living. 99.9% of the time its the low idle jet thats going to be the problem. its the smaller of the two jets. the larger one is the main jet. remove the float bowl and with a very good screwdriver, remove the jets. those would be the little brass things with the hole in them. you must be able to see through these hole. so hold them up to the light and take a look. use a little carb cleaner and a air compressor to blow them out. if your carb has an accel. pump fill the float bowl with a little carb cleaner and make sure it works and that the diafram has'nt any holes or tears in it. you can check by holding the diafram up to the light you'll need to remove the air mixture screw and clean it as well. turn the screw inward and count the turns before you turn it outward. be careful there will be a small spring ,washer and o-ring. in that order. clean the rest of your carb with cleaner and she'll run like new. one other thing. the needle and seat of the fuel inlet.with the float in the up or full position, you should not be able to blow through the fuel inlet. you may need to adjust the float and or replace the needle and seat. otherwise fuel will continue to run causing it to overflow or worse fill your crankcase with fuel. i hope this helps alot of you. have fun and ride safe!


on Mar 02, 2009 | 1987 Yamaha FZ 600

1 Answer

Chainsaw will not crank

this is classic fuel starvation, start, if you have not already done by replacing the fuel filter in the tank, if no better replace the fuel hose in the tank up to the carb, if no better remove the carb, under the pump side carb cover ( normally alluminium ) here you will find the an internal filter, clean or replace, if the pump diaphram curls up then replace, remove the metering side cover of the carb, check the metring lever here moves freely and lifts the needle, when re assembling on the metering side the gasket is used as a spacer so must go on first then the diaphram and cover, on the pump side the diaphram must go against the carb body followed by the gasket and cover, re set the jet screws to one and a quarter turns out from closed, if the saw is still not starting it is most likley a massive air leak, check the manifold between the cylinder and the carb for cracks, splits or loose, replace the crank seals, replace the cylinder base gasket

Feb 11, 2012 | Poulan Garden

3 Answers

Lawnmower won't start

I am not having any luck with crossing the number you passed. I really need just the number off the engine air shroud just above the spark plug. Having said that. I understand you have a fixed speed automatic choke Briggs and Stratton engine without a primer bulb.

To gain access to the carb diaphram it is not that hard. The carb and gas tank are removable with just 2 bolts after the air-cleaner is removed. One bolt with spacer is near the gas filler opening and takes a 1/2 inch socket to remove. The other bolt is on the front bracket and is a 3/8 head. Once you have the bolts out, pull gently and carb will slide off of the intake tube.
Then tip the bottom of the carb toward you (STOP note the linkage position) and then remove the linkage.

Tank and carb off....

NOTE: The diaphram may stick to either the tank or the base of the carb so be careful when separating carb from the gas tank. Remove the 5 screws holding the carb to the tank and lift straight up making sure the diaphrm is not stuck.
The diaphram is under the carb and will have a spring on it if yours has an automatic choke. Note which side of the diaphram the spring is on. On the side of the carb there will be a rectangular plate with ONE 1/4" head on it. Remove the plate. This is where the choke attaches to the diaphram. Before removing the diaphram inspect it for holes in places where is not supposed to
have holes. If there are no holes visible on the bottom of the diaphram remove the diaphram by disonnecting the linkage inside the side plate. Again inspect the top of the diaphram for holes. If you find any tears or holes take the diaphram to your nearest lawnmower parts supply and get a replacement. They
usually cost around $6.00
If your carb has a single fuel adjustment screw turn it closed until it just starts to snug up counting exact number of turns from the original position.
Remove the fuel adjustment screw. If you loosen it until it is almost removed the whole assy will pull out with pliers while screw is still installed.
(O-ring type mating area) Clean the hole and reinstall the fuel adjustment jet.
Turn it closed until snug then adjust to original position.

NO HOLES in Diaphram or before installing NEW diaphram.
Check the fuel pick up tube for obstructions especially on the bottom screen.
You should be able to pass air though the tube orally. Noting the tube is free of obstructions install the diaphram by connecting the choke link on the side of the carb and install the side plate. Install the carb onto the gas tank and evenly tighten the mating screws. Then take the tank and carb assy to the engine and connect the carb linkage. Slide the carb onto the intake tube and make
sure the O-ring on the intake tube is inside the carb intake throat. Install the 2 mounting bolts for the tank and carb assy.

Test engine.
Install the air cleaner screw. Fill the gas tank all the way to the lip of the tank where the gas cap screws on. (This will ensure that the diaphram has gas in it) It should start within 2 or 3 pulls.
If it runs... your almost done.
Take the air cleaner foam and wash it with gas until clean. Then oil the filter with oil gently squeezing it to make sure oil is evenly distributed.
Once oil is evenly distributed SQUEEZE out all excess oil by squeezing the foam as tightly as you can. Then install the foam and air cleaner.

Task complete.
Thanks for using FixYa


Apr 10, 2010 | Yard Machines 24a 021h700 4.5 Horsepower...

2 Answers


Air filter needs to be installed and clean. Check the seal at the carb,for tears or loose clamps.Also make sure fuel filter is cleaned out or replaced(dirt trash or water will stop fuel flow). If fuel pump is electric fuses may need replacement. If you still dont get better results you may need carbs cleaned.Not just add cleaner to gas,but removed and debris removed from jets float valve seat or filters inside.

Apr 07, 2010 | 2000 kawasaki KDX 125

1 Answer

I have a Snapper yard cruiser with a 15HP Kohler and Nikki Carb. THis Carb has no way to adjust Idle or High Speed fuel mixture. Since this engine repeatedly stalls with any load on it ecold or hot, I...

Correct that there are no adjustments, but try cleaning the carb jets first, as many times a small amount of debris in the fuel can cause a performance problem. A replacement carb will be close to $200, and NO carbs will be adjustable. A gasket kit is available if you need. Contact your local Briggs dealer to procure the part.

Try cleaning the jets first.
Fuel Starvation - Float Bowl Carburetor
1) remove air filter assembly
*be cautious of tearing the mounting gasket. If it does tear, you HAVE to replace it. It is part of the priming system
2) remove the float bowl fastener. This is the main jet
3) carefully remove the float bowl, the rubber o-ring/gasket will not be able to be used if it is removed, you WILL have to replace it
4) using a spray 'carb cleaner'
spray up thru the center of the carburetor
spray and clean the main jet with cleaner and 'tag' wire
(tag wire is very thin, and can be used to clean the hole in the center of the main jet)
5) clean any debris from inside the bowl or carb body
6) re-install bowl and center bolt, air filter assembly

*if you need gaskets, your Briggs dealer can supply. The kit is cheaper than individual gaskets, and all the parts needed to finish the above repair are in the kit.

I’m happy to assist further over the phone at

Nov 21, 2009 | Garden

1 Answer

Idles but won`t accelerate

Change fuel filter.
fuel pump sounds fine.
Check for kinked or blocked lines.
If it has a fuel recovery cannister service it.

Jun 11, 2009 | 2001 Yamaha V Star 1100 Classic

2 Answers

Surging tecumseh engine on snow blower

Hi, You have gum or old gas in the main jet on the carb, turn your fuel off, stand the snowblower on the front blower housing with handles in the air, remove main jet from the bottom of the carb and clean. Jim

Jan 30, 2009 | Garden

2 Answers

New model ut08580 backpack will not start

check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. check the primer bulb for pin holes and seating/sealed properly. if that doesn't work have the carb repaired at a service center or replaced.

Nov 11, 2008 | Homelite Consumer Products Backpack...

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