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Posted by nsheryka on October 11, 2005, 4:36 am
Hey all, i am just getting into the fun world of motorbikes, and just
got my first bike, a 1980 Yamaha xs400 special.
I know the bike will run, because i have gotten it to run! when i took
it home and changed the battery, turned the starter, and it started
right up, however it sounded like crap. After the initial start, she
would always start right up and promptly die after the choke was
turned off. So i thought it was a dirty carb.
Since then, i have changed the oil/filters rewired the old rusty fuse
box, and done a few other small things. My guess of a dirty carb was
correct, I took the carb off, disassembled it, and cleaned the living
hell out of it (including getting a replacement for one of the jets).
After i re-assembled everything, it was to my surprise that it
wouldn’t even start up like it used too with the choke on. It sounded
like nothing was happening at all, no fuel was getting to the engine.
Using some engine starting spray applied directly to the carbs, she
fired right up and burned for 2 seconds or so, till the starter spray
burned away, then died. So now it is not getting any fuel. I know
fuel is hitting the carbs, because the bowls are full.
Any ideas??
i would really appreciate any advice.
Thanks
nick
http://img53.imageshack.us/img53/42/picture35vr.jpg
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Posted by Nils on November 30, 2005, 5:22 am
Nick,
I realize that you have had more than a month to solve the problem and I
sincerely hope you already did. If not, here are a few possible problems
areas:
A friend of mine used sealant to seal the carburator, 'cause he didn't want
to spend money on the gaskets/O-rings, etc. Turned out to be a bad idea.
Hope you didn't do the same? With a bike of that age, I'd suggest you buy
and use new original seals.
Anyway, no fuel at all is usually related a stuck/wrongly mounted floater.
If the carb, incl. the floater chamber, is dry, then that's where the
problem is. If a bike sits unused for many years, the floater often breaks,
because it has been dry for an extended period of time. See if you can bring
it back to life (lube it with motor oil and play with it). If no success, a
new is required.
You replaced a jet? Was it the main or the idle? Check if there is any dirt
or metal inside the new jet or its seat. Has been seen before.
Finally, use compressed air to ensure that all the channels and connections
in the carb are clean. Some of them are so small, that they are easily
missed. Check also for holes on the edges, close to the seals.
Nils
> Hey all, i am just getting into the fun world of motorbikes, and just
> got my first bike, a 1980 Yamaha xs400 special.
> I know the bike will run, because i have gotten it to run! when i took
> it home and changed the battery, turned the starter, and it started
> right up, however it sounded like crap. After the initial start, she
> would always start right up and promptly die after the choke was
> turned off. So i thought it was a dirty carb.
> Since then, i have changed the oil/filters rewired the old rusty fuse
> box, and done a few other small things. My guess of a dirty carb was
> correct, I took the carb off, disassembled it, and cleaned the living
> hell out of it (including getting a replacement for one of the jets).
> After i re-assembled everything, it was to my surprise that it
> wouldn't even start up like it used too with the choke on. It sounded
> like nothing was happening at all, no fuel was getting to the engine.
> Using some engine starting spray applied directly to the carbs, she
> fired right up and burned for 2 seconds or so, till the starter spray
> burned away, then died. So now it is not getting any fuel. I know
> fuel is hitting the carbs, because the bowls are full.
> Any ideas??
> i would really appreciate any advice.
> Thanks
> nick
> http://img53.imageshack.us/img53/42/picture35vr.jpg
> --
> Posted using the http://www.motorcycleforumz.com interface, at author's
> request
> Articles individually checked for conformance to usenet standards
> Topic URL: http://www.motorcycleforumz.com/Yamaha-Carb-ftopict139810.html
> Visit Topic URL to contact author (reg. req'd). Report abuse:
> http://www.motorcycleforumz.com/eform.php?p=7514661
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> got my first bike, a 1980 Yamaha xs400 special.
> I know the bike will run, because i have gotten it to run! when i took
> it home and changed the battery, turned the starter, and it started
> right up, however it sounded like crap. After the initial start, she
> would always start right up and promptly die after the choke was
> turned off. So i thought it was a dirty carb.
> Since then, i have changed the oil/filters rewired the old rusty fuse
> box, and done a few other small things. My guess of a dirty carb was
> correct, I took the carb off, disassembled it, and cleaned the living
> hell out of it (including getting a replacement for one of the jets).
> After i re-assembled everything, it was to my surprise that it
> wouldn't even start up like it used too with the choke on. It sounded
> like nothing was happening at all, no fuel was getting to the engine.
> Using some engine starting spray applied directly to the carbs, she
> fired right up and burned for 2 seconds or so, till the starter spray
> burned away, then died. So now it is not getting any fuel. I know
> fuel is hitting the carbs, because the bowls are full.
> Any ideas??
> i would really appreciate any advice.
> Thanks
> nick
> http://img53.imageshack.us/img53/42/picture35vr.jpg
> --
> Posted using the http://www.motorcycleforumz.com interface, at author's
> request
> Articles individually checked for conformance to usenet standards
> Topic URL: http://www.motorcycleforumz.com/Yamaha-Carb-ftopict139810.html
> Visit Topic URL to contact author (reg. req'd). Report abuse:
> http://www.motorcycleforumz.com/eform.php?p=7514661