I have a 75 250 penton and I'm having a tough time getting it running. It ran with the timing the way it was set when I got it but only by jumping it.The top end is new and it has a new mikuni. I set the timing and it's quite a ways from where it was set when I got it. It will still only jump start. I'm not sure what I am missing about this. Anyone have an idea of what I need to do?
Thanks
Dale
74 puch 175 SD
73 Husky 360 WR/RT
75 Penton 250
10 ktm 250xc
02 bmw r1150r
How did you go about setting the timing? Did you use a dial indicator or...?
Pete Petrick
175 Jackpiner
Slow but Good
Yes but I'm not sure I understand the manual. It shows 2.25mm V OT.
What is V OT? I read it as BTDC in the manual.
Maybe the motoplat is weak? I've seen better spark but I've seen worse too.
74 puch 175 SD
73 Husky 360 WR/RT
75 Penton 250
10 ktm 250xc
02 bmw r1150r
Quotequote:Originally posted by Dale Sonnenschein
It ran with the timing the way it was set when I got it but only by jumping it.
CLASSIC symptom of a weak/failing Motoplat. Bad Motoplat, for sure.
Brian
Also a symptom of a leaking ignition side crank seal is having to always push start the bike. If you are not sure of the seal condition, try squirting a little gas/oil mixture in the spark plug hole, put the plug back in, and then see if it tries to kick start. When the crank seal starts to leak, it causes a weak signal to the carb that won't pull enough fuel mixture into the engine to start easily. Also, the 74 250 HS timing spec, is 2.55 BTDC, which is a little more aggressive than the later 78-80 bikes. Mike
Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R
Also a classic symptom of Mikuni (enrichening circuit instead of true choke or tickler system). Need to keep throttle completely closed for enrichening circuit to work.
Ernie P.
Chattanooga, TN
If Motoplat, 2.6mm BTDC. Use a Sachs timing tool or similar, you can't miss. Any questions, send the ignition and coil to PVL to be tested and re magnatized. Ask for BJ or Jerry
THanks Guys, Looks like i have a little work to do.
74 puch 175 SD
73 Husky 360 WR/RT
75 Penton 250
10 ktm 250xc
02 bmw r1150r