Recent content by darins

So after allot of help here I was able to track down the problem to air leaking on the right side.Thanks (surfjag) There is a bushing between the crank and the seal on the right side and it is leaking between the crank and bushing. What do I use to fix it? I have silicone gasket and 1194 on hand or?

Ahhh, you know I forgot the right side seal is in there. I will check it first. It was a new seal but I will check anyway. Thanks I:I

Well after a 5 min conversation with Ken at http://kenoconnorracing.com He convinced me my problem was a air leak somewhere, didn't take long to convince me as he is the man in the know. I set off to check the leak down and voila. It starts at 10 psi and drops to 4 psi in about 10 seconds and...

The piston is new, cylinder fresh bore with .003 clearance so perfect there. If it was piston slap would it over heat and continue to run when the ignition was turned off? I made it ping intentionally just to do a plug chop. The plug looked perfect but when I turned the ignition off it still...

I have done all the jetting, ran a fat main, fat pilot and came with a jjh needle and even tried a JJE and still pinging is there

uni foam fillter, 125 psi compression, running super 92 octane with maxima oil 32-1,stock stator with stock timing key.

I bought the motor second hand from a local salvage cycle. I rebuilt the bottom end with hot rod con rod and rebuilt the top end with fresh bore and new piston. the local shop did all the metal work and crank. I spared no expense in doing this, so I am a little disappointed with the results. Has...

yes it does I measured the smallest part at the outside

So I have a blaster motor that was giving me some problems. It would ping at high RPM when you let off the throttle. Figuring it was a lean condition I proceeded to change the main jets, pilot and jet needles to the ridiculous and the problem was still there. I had the jetting perfect at one...

It has a TC exhaust, 93 octane, leak down fine, compression at 125. BTW has a new keihin pwk28 this was measured using a piece of solder between the piston and cylinder in the up position. here are the actual measurements 10mm from bottom of piston 2.655 top of cylinder 2.657 bottom cylinder...

but could this be the problem with the knock (ping) at around 6k at cruise?

Yes I bought a pro x piston and the machine shop was supposed to bore it to match. .060 over

Ok so here is the deal I transplanted a blaster motor to a ysr50 and the thing screams. Idles great, accelerates perfect. The only problem I have is when I let of the gas to 1/4 throttle (cruise) at around 5-6k it pings or knocks like crazy I messed with jetting going extreme from one end to the...