Question about Yamaha YZF-R1 Motorcycles
Hi, Tom and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
18. Check for engine trouble codes
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OEM parts for Yamaha
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Posted on Aug 29, 2016
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Posted on Jan 02, 2017
I have a tw200 and when I have this problem its from the cam chain slipping back a notch when I unload it from my truck. I leave it in gear so when I let off the cluch it acts as a brake. I ride by my self so thats why I load it that way. I am guessing you load and unload your tw the same way. So remove the timing cover and make sure you are tdc on both the upper and lower timing marks. The bike will run if the timming is off a bit. It's really easy to set the timing on these bikes. It's easier to look for how to on the xt 200 if you need more help.
Posted on Jan 07, 2010
SOURCE: yamaha 2001 r1
id check the exup valve first! Clean and lube it up with copper grease or the like. if your lucky thats all it is if not the gears inside the servo motor are stripped but just changing the servo motor could strip the internal gears if the exup valve is still seized
Posted on May 31, 2011
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