70cc lost of power (help!!!)

[kjparker]

I think i might have found the problem.

I took the carby apart completely and got some dirt out of it and now its running better.

I checked spark plug and it was a browny/black colour and so i have read this means it was not running lean and that the problem must have been the dirt in the carby.

You **are** using a fuel filter right?

 

[Mountainman]

I've been having the exact same problem the last couple days, so I finally took my carb apart. The whole thing was nice and clean inside, not a speck of dirt anywhere...BUT...

...my float was half full of gasoline

It had a tiny little hairline crack in the wall of the "donut hole". The crack was so small I couldn't even get the fuel back out, so I had to drill a little hole, drain the float, clean it up really good, then patch the holes with JB weld...still waiting for it to cure right now.

I like that JB weld -- just wondering how well it holds up while sitting in gas ? Mountainman

 

[arielatom300heps]

no i am not using a fuel filter.

 

[lildeezul]

there could be your problem..

if dirt gets into your fuel sytem, it can clogg up the carb, or worse, damage the piston and cylinder walls...

put a fuel filter on there

 

[pilotpeat]

RE the JB weld and gas-I had a weedeater gas tank that had several small cracks in it that I repaired with JB weld, and they held for a year or two before the JB weld eventually fell off. I then re-repaired it and it held for a few more years. This was on a plastic fuel tank. What I've been able to figure out is the plastic has to be SUPER clean and if possible scuffed up with some coarse sand paper. (like 50 grit) I don't know about using it on the inside of the carb-if the weight of it will make the float to heavy or if it will stay on with all of the vibration.

Pete

 

[Jakylpops]

Yeah, I scuffed it up good first.
I put about 30 miles on it today and it ran great, but I'm not expecting it to last very long, I've used JB weld to repair pinholes in motorcycle tanks before and they've lasted for many years. Anybody know where to get a new float? or got idea for material to used in fabricating another one?

 

[Mountainman]

I like that JB weld -- just wondering how well it holds up while sitting in gas ? Mountainman

Any chance you can solder the float ?? That would make for a real repair.. Don't see many - ever leak -- not wearing - rubbing any where is it ? Happy Riding from - Mountainman