no power By 1nfidel (Read 983 times)

[1nfidel]

Here's my problem. Scooter (Yamaha Jog 1996 - 50cc) starts fine, idles and starts off ok. When you really twist the throttle to go, it stalls. If you lift the rear wheel off the ground it screams, no sputters, no stall. If you hold the rear brake, with the wheel off the ground it does the stall. I have just put everything back together after a paint job. No pinched vent or vacuum lines, already checked. I did have the rear wheel off to paint, the nut was so tight I had to use an impact to remove it. Is it possible I spun something in the drive? And could a drive problem cause this condition? Here's the really bad news, I have no manual and I'm a Harley tech by profession, can anybody help me?

[lonnie6890]

I had a problem that sounds like that on a 50 myself. I found the problem in the fuel filter. The filter let enough fuel through to run flat out with no load but not under load. A water logged filter. A new filter fixed the problem for me. May or may not be the problem you have. Hope this helps. Also you might want to drain the float bowl any way.

[docmackinnon]

Hmm...have you checked your exhaust pipe?

I just put a new exhaust pipe & muffler on my R7E a few weeks ago, and noticed great improvement in performance as well as sound...fewer cops glaring at me at 3am.

But...last weekend, I was on a country road and suddenly fund myself with some weird vibration and sudden loss of forward speed. And sure enough, the exhaust bolt had loosened.

On a DiBlasi, there is a copper ring that fits into the cylinder exhaust port, and you then tighten the nut that encircles the pipe
and I used some Blue Loc-Tite. And that nut was loose!

Luckily I carry a crescent wrench in my backpack tool pouch as well as a pair of pliers- once snugged down the power returned and the vibration dissapated.

Doc