QuestionI have a 2000 Yamaha TTR90 on saturday the bike was removed from storage from the fall of 2002. After some fresh gas and plug the bike started and ran fine. My nephew rode the bike for about an hour shut it off and then his brother rode it for another 10 min and shut it off.
About an hour later they attempted to start the bike and it would not even fire.
1. I checked the plug and there is good spark.
2. The cylinder is getting fuel.
3. Checked the kill switch for a short it appears to work.
4. Verified and cleaned all electrical plugs and connections.
Still the bike will not even begin to fire or sound like it will. There are 2 electrical plugs on the carburator (what do they do)?
There is a black box under the seat, what is it?
There is a silver diod or cap under the tank, again what is it?
I assume there is more to the ignition system than just the plug, coil & points.
Could it be one of those other components in the electrical system that is inhibiting it from starting.
Any input or suggestions would be greatly apprecitate, they want to ride and we don't have a lot of disposable cash right now.
Thank You in advance.
Bob Ward.
AnswerHi Bob,
Q: There are 2 electrical plugs on the carburator (what do they do)?
A: One is a heater the other may be a sensor. My microfiche shows only one component on the carburetor.
Q: There is a black box under the seat, what is it?
A: This is the C.D.I. (ignition module).
Q: There is a silver diod or cap under the tank, again what is it?
A: I think you're referring to the regulator/rectifier.
I assume there is more to the ignition system than just the plug, coil & points.
A: CDI, ignition coil, pick-up coil, spark plug, no points...all electronic ignition.
Q: Could it be one of those other components in the electrical system that is inhibiting it from starting.
A: I think the electrics are working properly. I suspect the carb needs attention from the long storage. Gas in carb may have varnished during storage and finally interrupted engine performance. I'm surprised to hear that it started and ran after 2 years. It's difficult to diagnose without being present.
An engine needs three elements to run: adequate cylinder compression, spark at the right time, and proper air-fuel mixture.
Carefully remove the carb's float bowl. Avoid spilling fuel, you'll want to examine it for sediment, water, and varnishing (gummed gas). If you see anything in the fuel, thoroughly clean the carb. Clean every passageway and removable jet (brass parts).
Send me an email address as requested. I'll return repair info files that may assist you with home repairs. My email addy is: mshively1@woh.rr.com
Respectfully,
Mark Shively
