I have a YS 63 that's recently been playing up.

It's about 8 months old and has seen fair use. Up until about last week it has been great, pickup was a little slow but reliable at least.

Last week it saw a slight loss of power, I thought no more of it, the last few days it's been losing RPMs during snaps and knife edges. Pickup is very slow and quite unreliable. Had 3 deadsticks tonight, these are the first 3 ever on my Yss.

Noticing that there was no pressure in the tank, I soon found a hole in the feed line,. fairly big. Definate cause of problem I thought. Fixed that and ran it again, no luck, ran exactly the same, and very little pressure in the tank.

There appear to be no more leakages anywhere, but I noticed that fuel pours from the carb, especially at idle.


I'm guessing the problem is to do with a regulator blockage?

Do these symptoms mean anything to you ??

If you think you know the solution, can you describe it to me please.



Many thanks in advance.