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In need of brain storming from everyone

  • Thread starter Thread starter Anonymous
  • Start date Start date
Ok, I read some other post on how to do the compression check. Took out all four plugs, put my tester in plug #1 opened thottle all the way and hit the start button. Did the same on the other three. Here are my results going left to right (if sitting on the bike).

#1 = 91; #2 = 90; #3 = 92; #4 = 90

So if they should all be around 120, then I got problems then, right?

Is it just fouled valves or is it bad induction tubes/gaskets?
 
Gary McLellan said:
What condition is the battery in? How new are the spark plugs? Electrical problems are often diagnosed as carb problems. IMHO, Yamahas are designed by engineers from hell.
Click to expand...

Battery and plugs are brand new.
 
All you compression readings are close to the same, so my inclination is that is is not valves because if you had a burned or open valve, there would be no compression. I think you have worn rings. How many miles are there on the bike? To confirm that it is a ring problem. repeat the compression test but this time just before you screw the compression fitting, put about 1/2 teaspoon of oil into the cylinder through the spark plug hole. Your compression should increase because the oil will seal the rings. If it makes no difference, then it isnt a ring problem. Let me know.

Earl



quote="JGonier"]Ok, I read some other post on how to do the compression check. Took out all four plugs, put my tester in plug #1 opened thottle all the way and hit the start button. Did the same on the other three. Here are my results going left to right (if sitting on the bike).

#1 = 91; #2 = 90; #3 = 92; #4 = 90

So if they should all be around 120, then I got problems then, right?

Is it just fouled valves or is it bad induction tubes/gaskets?[/quote]
 
The bike only has 20,xxx miles on it. I will do a wet compression test next (tomorrow most likely) and post the results of that test. I will also try spraying some started fluid around the induction tubes while the bike is running to see if there are leaks there or not. Will let you know what happens.
 
My Clymer manual says:

Make sure the engine is warm

Remove all the spark plugs.

Make sure the choke is off.

Connect the guage to one cylinder.

Hold trottle completely open.

Crank until guage does not increase anymore.
 
Ok, I have done the wet compression test and my numbers stayed about the same (i.e. +/- 2 psi). I have also moved the fouled number 1 plug and switched it with the number 4. The results of this confusses me. The number 1 plug that was fouling real bad in cylinder #1 is now burning just fine in cylinder #4 and the good plug from #4 put into #1 is also burning just fine. So what makes the one plug foul in #1 but does not do the same when different plug put in #1?

Anyhow, the bike runs good now. Still a little sluggish when first getting on the throttle, but my bike has the same problem which has been contributed to my induction tubes/gaskets, I am assuming this bike is suffering from the same issue (stored nine years).

Anyhow, this guy who owns the bike is a cheap S.O.B who ain't paying my nothing to get this running and complains when I tell him I needs parts to do it, so I think I am done working on this bike. It runs/drives good and and thats all he wanted anyhow.

Thanks for everyones help. Especially Earl. I wish I had someone like this that lives close to me to not only help me out, but that I can watch and learn first hand from. While this forum is the best, having someone by your side is even better.
 
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