Power User
Got the holeshot
I tore apart the fuel pump looks okay, doesn't have any pin holes. Thewill start occasionally and then die and won't fire back up(Cleaned up the carb). Plug looks okay as well? I put my thumb over fuel pump hose coming from the cylinder and I'm not getting any pressure? Its also backfiring, I switched coils to little to no effect. Any ideas would be great.
Last edited by factoryX; 05-16-2013 at 09:45 PM.
Power User
Roostin Away
Doing this to subscribe. I am also having the exact same problems!
At The Back Of The Pack
Arm chair racerAt the back of the pack
Got spark?
Backfiring.... Flywheel key sheared?
85 tri-z (in pieces)
421 cub banshee
Loves Corn.
Catch me if you can
man thats pretty vague .. it is hard to feel the pulse off the cyl ... vacuum gage? .. hows the Rings?? what shape is it in? what carb.. ect... very difficult to pin point your prob .. with out actually seeing it ..had a guy call me at the shop today... wanted me to tell him what was wrong with his car ... by making the noise with his mouth...
Power User
Roostin Away
Sounds like its one of your days to be a mind reader and to know what is exactly going on!Originally Posted by Bryan Raffa
man thats pretty vague .. it is hard to feel the pulse off the cyl ... vacuum gage? .. hows the Rings?? what shape is it in? what carb.. ect... very difficult to pin point your prob .. with out actually seeing it ..had a guy call me at the shop today... wanted me to tell him what was wrong with his car ... by making the noise with his mouth...
Power User
Got the holeshot
The symptoms are very vague, but here are the details. The bike sat in a field for 7 years under a tree after this guy's brother died(Possibly longer..). I thought it would be a complete utter basket case but the dry climate with no salt here in the high desert of central oregon does wonders and everything looks to be in decent shape. I need to replace motor seals, but so far its not sucking transmission fluid, its holding coolant and runs great when it does. Everything on the bike other than the boyseen reeds and answer silencer is stock. I'm just confused really as by all means it sounds like it just needs a pump rebuild, but it doesn't explain the backfire? Has about 160-170psi, and I'm running a br8eg plug. Has spark, but a little on the weak side? Either timing is way off or both my coils are probably crap which is a possibility.
At The Back Of The Pack
Arm chair racerAt the back of the pack
Sheared flywheel key = timing way off
85 tri-z (in pieces)
421 cub banshee
Loves Corn.
Catch me if you can
pull the fly wheel cover and the fly wheel ,, see where the stator is set to the hash mark.. put it in the middle if not.. inspect keyway and key..
Power User
The day begins with 3WW
Agreed on some sort of timing issue. Also, if you want to eliminate the fuel delivery theory, put some fuel directly into the carb, bypass the pump.
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Arm chair racerThe day begins with 3WW
Hello
Looks like you have lot’s of help and the tri z expert is here but just wondering.
Can’t you take the plug out ground it then kick or push it in gear to check “idle” timing with lite?
If it’s firing on time the key is obviously good.
Have you tried what post 9 says?
You say you have weak spark. Some bikes just look that way Bryan or another will be able to tell you if it’s correct or not. OHM test coils per manual anyway and voltage output while kicking bike over if possible. Post results. If that’s all good then it’s a good chance it’s your CDI box. I would pull the flywheel, if it’s since it’s been sitting in a field it’s possible the magnets or coli ends might be rusty and not creating good magnetism.
Was the pump diaphragm dried up or still EASILY pliable.
Electronics do NOT like to sit outside in a field for 7 years even in Oregon.
Power User
Got the holeshot
Have you tried a new plug.
250r rules
Power User
Catch me if you can
My $0.02 is to put a hose with nice clean cut ends on that vacuum elbow on the cylinder, lick your finger, put it over the end of the hose, close your eyes and with the spark plug installed and the ignition switch off have a buddy kick it over hard a few times. You should feel a pulsation on your finger. If not it is plugged somehow as your cylinder pressure indicates a pretty good ring seal. The only other thing I can think of that would cause a lack of a pulse in the line with good compression is a broken reed, but I think you would hear air coming back through the carb if that was the case.
Rebuild the fuel pump. Good or not it can’t hurt and it’s less than $30.00 bucks, so why be left wondering if it’s a problem.
Only after this would I start looking at electronics.
Remember, you get what you pay for and this advice was free
Power User
Catch me if you can
^ That in itself is good inexpensive proactive maintenance.
The pumps are know to fail. IDK where your fuel filter is but I always remove them and put an inline filer in.
When it dies, shut off the gas petcock immediately. If your carb has a drain screw, loosen it and see if the bowl is near dry.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country
Power User
Got the holeshot
It does get a little gas, but next to nothing and even more so now. I've actually ridden it(No bottom end) but after a few minutes it won't start again and the plug is dry. I have the flywheel cover off, little to no corrosion. Don't get me wrong, it needs work, but its still in great shape for sitting for so long. Its even more unbelievable that it even started. El Camexican, I did that yesterday before I even posted, no dice.
Power User
Catch me if you can
Good point, that gasket could have chunked up and clogged something
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