Author Topic: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak  (Read 477 times)

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Offline robinkwmack

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #20 on: November 10, 2019, 11:43:24 AM »
Hey there, sorry for the delay! I did not get any notifications about responses to this thread and I am still stuck with this issue and as one of you said, it really does defy logic. I have gone through the carb multiple times with carb cleaner and I am still having the same issue. I even adjusted the float to allow a little more fuel to see if that was the issue but nope, and ran like it was getting too much fuel.

I will start using 91 octane and change the ratio as you recommended. I have been using only yamalube as my mix oil. Going to tear into it all one more time and see if one of the vents is clogged, but I am PRETTY dang sure I have sprayed out every last crevice in that damn carb. I doubt it is the float valve sticking since when I remove the float bowl fuel will gush from the tank as normal (through the fuel line into the carb). So it seems to be refusing to let more fuel in once the float bowl is filled for the first time, when running or not. It is a true anomaly. Last thing I need to iron out before I can truly ride it more than 3 miles. Runs great except for this issue and maybe needing some new clutch plates, but that's for a later date.

Thank you all again for chipping in, hopefully I can get at least one solid ride in before it's far too cold here in Western Massachusetts.

I'll be checking back here more frequently than I have before now that I know responses don't always send notification emails.

Offline rwgibbon

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Re: Need Help: 1969 RS200 MkII, Melting Hole In Piston & Crank Seal Leak
« Reply #21 on: November 10, 2019, 02:53:20 PM »
I just finished getting a 350 GTR running and no matter how many times
I cleaned and adjusted the right carb I could not get it to run properly.

The right carb did not appear to be letting fuel get through to the right
cylinder. Even though it always had fuel in its bowl.

I finally put a different carb on it and it now is running like it should. It idols and
responds to the throttle.

No matter how good you think you have cleaned the carb sometimes there is
something in one of the galleys you just can't clean.

Have you tried swapping the carb's?

That could help identify if it is a carb problem.

Good luck and don't give up.

Regards

Randy



 


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