Web moped2.org




Date: Sat, 08 Apr 2000 11:08:58
Subject: Re: HELP! My Puch Is Dying
From: Kiroja
Reply to author   Post followup (list members only)   Back to index   Subscribe to the mailing list   Unsubscribe from the list  

> scbnet@jps.net wrote:
> > Today I was riding my Puch (1980 Maxi, I think). I went to the
north part of town to my friends house and back. I travelled a
total of 40 miles in about two hours of time. > > On the way
back, it gradually began losing power. Where my usual cruising
speed is about 30 mph, after about a half of an hour of this
gradual loss of power I was topping at 12 mph. > > Finally I got
home. I did some diagnostics. Nothing in the carbuerator was
clogged. No fuel lines or filters were clogged. It was getting
a spark. It had gas. I messed with the mixture screw. I can't
figure out what is wrong. > > My suspects are, > - Improper fuel
mixture (this has never been a problem, but who knows?)

If you mean by that the oil/gas mixture, can't be it. If you
mean the gas/air mixture, could be. Like Thomas noted it can
very well be a clogged jet.

> - Timing, (It was getting a spark for sure, but I did a little
bit of off road and something might have gotten shaken up.)

I think you have a winner here. Most likely the problem lies in
the ignition. It's eitherbad timing or the ignition coil
starting to die. Probably not the condensor, cos that usualy
results in an abrupt engine malfunction. If the spark is too
late it'll result in less power and low RPM's and usualy the
engine will only run with the throttle open at max. A simple
check can be done as follows. Take the sparkplug out and put a
screwdriver in till it touches the piston. (it goes without
saying that one shouldn't scratch the cilinder wall doing this)
When you trun the flywheel you can feel with the screwdriver when
it reaches the highest point. 2 mm befor you see the piston
reaches it highest point your ignition points should start
opening. If they start opening after the piston reaches the
highest point the igntion is set too late. You can adjust the
timing by loosening the screws holding the ignitionplatform and
turning it till the points start opening at the right time. You
don't need to take the flywheel off for this.

Robbert

Reply to author   Post followup (list members only)   Back to index   Subscribe to the mailing list   Unsubscribe from the list  



Forums at Moped2.org Privacy policy
Moped2.org Home My other sites

Home   Contact
Wikipedia Affiliate Button