Have a 125 yamaha breeze. Sat for a few years. Put a new carb on started ran good. Put a new starter clutch on and now I get crank and no start. It has spark. The cab is getting fuel. I pulled it and cleaned it just incase. What am I missing? There was nothing electrical in the belt drive case. Thank you in advance for your help.

 

We took in a Breeze part exchange for a bigger quad, seemed fine except it dribbled fuel. On a close look it had a suspiciously new looking carb with that W mark which the Chinese copies have. I spent hours setting up the float level, and the choke kept sticking, seemingly due to the (new) outer cable popping out of the carb when you pushed the choke in. We got it running right and sold it at Christmas, it came back within a couple of weeks, wouldn't start, fresh plug and it was away again. Then back as a non starter after another couple of weeks. I tried gluing the outer cable in place, assuming it was sooting the plug when the cable stuck. Still it would suddenly refuse to start until you gave it a fresh plug. We gave the owner a tidy Honda 300 and put the Breeze back in stock. I'm convinced it has something to do with the Chinese carb, but it seems to run fine once you do get it going. Try a fresh plug is my advice.

 

Thank you for the information. Sounds like that could be the issue. Because I did put a cheap carb on it. I'll have to look at that.

 

Well it's still a challenge. Bike had low compression. Took to a repair guy to check. Pulled cylinder head and replaced cylinder put it back together. It now has 90 psi in the cylinder and still won't start and the repair guy has basically given up on it. Don't know where to go from here.

 

If you still have the old carb I would be cleaning it out and putting it back on, only wish I could have done that with the one we have. Another possibility is the ignition system slightly out, giving a spark but maybe not quite a good enough one. However substituting ignition parts in the hope of finding one that fixes it, can work out expensive and may not make any difference. I forgot to mention the Yamaha problem of cracks in the inlet manifold, that is another possibility, ours now has insulation tape wrapped around it, that didn't do any good either.

 

I gave the mechanic the old carb. It wouldn't start with either carb. The manifold has been replaced when I got the bike years ago. But I'll look at it again. I'm to deep into the bike now to just scrap it.

 

If it won't run at all now, it is worth doing the ignition tests, exciter and pulse coil resistances, etc. Check flywheel TDC mark is actually TDC by the piston. If it isn't, the key must have sheared, the mechanic would also time the cam by this mark, so it would throw cam timing out, as well as spark.

 

Up date the bike is Running. After replacing the cylinder and piston. The first mechanic gave up said he can't fix it. Took it to second mechanic. It had 2 bent valves likely from previous mechanic timing it wrong that he admitted to initially. So now with all new top end it runs great.