JP
Superbike Rider
'yeeeeawwwwnnn!'
Posts: 2,173
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Post by JP on May 11, 2011 17:20:59 GMT
Went out on my VFR400 yesterday up to helmsly, on the way back it decided that from great broughton to stockesly it was going to run like it had little petrol, (felt like two cylinders).
Started to run fine again from stocksley to home (yarm) then later on when i went out on it, it cut out when i arrived at my destination, an hour later it just wouldnt start, finally started it on full choke and it was definately not running on all 4 cyclinders, managed to get it home after it cut out 3 times.
then it startted to run fine again on the drive.
things i've done to it since i started riding again:
Bigger main jets (110 to 120)
De restricor box in speedo housing
new air filter
new oil filter
new oil
carb clean
new spark plugs
valve clearance check
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bucko
Pit Crew
Posts: 164
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Post by bucko on May 11, 2011 17:44:41 GMT
are your valves a little "tight"?
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JP
Superbike Rider
'yeeeeawwwwnnn!'
Posts: 2,173
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Post by JP on May 11, 2011 17:49:26 GMT
When i checked the tolerances they were all fine, basically factory tolerances according to the haynes manual
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bucko
Pit Crew
Posts: 164
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Post by bucko on May 11, 2011 18:37:49 GMT
ok how about your coils breaking down when there getting hot?are your pipes hot when it runs rough?
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JP
Superbike Rider
'yeeeeawwwwnnn!'
Posts: 2,173
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Post by JP on May 11, 2011 18:43:05 GMT
pipes run hotish but always have, started up on two cylinders from cold then improved a little when i got home, the bike does smell a little rich, but then i may have flooded it a little on attempting to start it
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Post by nigec on May 11, 2011 18:53:47 GMT
Does it have a big lump of plastic above the cylinders with the plug leads going through it?, I know on Blades and the EXUP it was quite a challange getting everything put back right, maybe a plug lead has popped off.. or the airbox come adrift
If it was the de restrict0r it wouldn't rev past 4000, but low revs it would be fine
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JP
Superbike Rider
'yeeeeawwwwnnn!'
Posts: 2,173
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Post by JP on May 11, 2011 18:58:45 GMT
No plastic above cylinders, the rear sparks are in havent had chance to check the front two, i'm gonna have to pull her clothes off to have a look at her properly
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Post by nigec on May 11, 2011 19:08:37 GMT
Does it still have a sidestand switch? older honda used to have problems with the switch on the clutch, making them run like a dog.. WD40 used to work.. look for the obvious then try that  |
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JP
Superbike Rider
'yeeeeawwwwnnn!'
Posts: 2,173
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Post by JP on May 11, 2011 19:21:45 GMT
good idea, could be that, will give it ago
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tyreslider
Superbike Rider
If its not broke leave it alone.
Posts: 2,335
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Post by tyreslider on May 11, 2011 19:29:36 GMT
Is it a vacuum fuel tap check that also m8.
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Post by tarmacmuncher on May 11, 2011 19:38:34 GMT
Had a similar problem with the vfr. Turned out to be one of the coil packs over heating. If your handy with a multimeter then have a poke around when the bike is cold and then hot. Or do what I do, check all the cheapest possibilities firs lol.
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