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revs hanging

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hmmmnz
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PostPosted: 23:03 - 14 Jun 2007    Post subject: revs hanging Reply with quote
well this is reguarding my oldskool cb250 g5 of the 76 vintage.
the revs hang for a few seconds before falling back to a stable idle and even while riding it.
it doent appear to have any air leaks as far as i can tell(done the wd40 and butane tricks)
the valve clearance have been set according to the manual
the carbs have been cleaned out.

any other ideas???
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bish777
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PostPosted: 01:26 - 15 Jun 2007    Post subject: Reply with quote
sticky throttle mechanism, cable.

pinched cable in its run somewhere?
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hmmmnz
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PostPosted: 01:45 - 15 Jun 2007    Post subject: Reply with quote
lol, i wish Very HappyThumbs Up
all new cables straight run no pinches Thumbs Up
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willi
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PostPosted: 01:56 - 15 Jun 2007    Post subject: Reply with quote
running lean. air leak between manifold and head. or adjust mixture screws. also the timing could be out.
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BanditsHigh
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PostPosted: 06:20 - 15 Jun 2007    Post subject: Reply with quote
Meant to say Logan check the carb diaphrams ... if they have a hole in them then it'll rev slower and take more time to drop the revs Thumbs Up

Barry
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hmmmnz
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PostPosted: 09:09 - 15 Jun 2007    Post subject: Reply with quote
no air leaks anywhere. Thumbs Up

cheers barry good thinking, something i never checked over, ill have a look now Thumbs Up
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bish777
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PostPosted: 10:57 - 15 Jun 2007    Post subject: Reply with quote
the diaphragms wouldnt make the revs drop more slowly i dont think, it would just act like a restrictor and prevent the motor revving out.

Perhpas you have a sticky slide possibly?
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hmmmnz
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PostPosted: 12:24 - 15 Jun 2007    Post subject: Reply with quote
well pulled the carb tops off, did the right side first and everything was perfect, i almost didnt check the other side, and i noticed that there had already beed a repair to the diaphram, and that their was a fairly large split, damn, oh well ill have a look on david silver spares and see how much a new one is..... 33 fucken quid for a chunk of rubber, fuck that, i could get a set of carbs off ebay for that, fuckers,

barry do you reckon your mate would sell some carbs or the diaphram to me Very Happy Thumbs Up
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Odie
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PostPosted: 15:53 - 15 Jun 2007    Post subject: Reply with quote
There is a company called "NRP" that do cheap replacement diaphrams.
Do not have details, sorry.
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hmmmnz
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PostPosted: 16:09 - 15 Jun 2007    Post subject: Reply with quote
Odie wrote:
There is a company called "NRP" that do cheap replacement diaphrams.
Do not have details, sorry.

you are a gentleman and a scholar Very Happy
they were £31 i think thats as cheap as im gunna find,
so far ive had prices of up to £78 thats mental
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Odie
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PostPosted: 16:14 - 15 Jun 2007    Post subject: Reply with quote
hmmmnz wrote:
Odie wrote:
There is a company called "NRP" that do cheap replacement diaphrams.
Do not have details, sorry.

you are a gentleman and a scholar Very Happy
they were £31 i think thats as cheap as im gunna find,
so far ive had prices of up to £78 thats mental

I am also an "arse licker, a gentleman and a fine judge of horse flesh"! Mr. Green
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BanditsHigh
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PostPosted: 16:27 - 15 Jun 2007    Post subject: Reply with quote
Quote:
the diaphragms wouldnt make the revs drop more slowly i dont think


The diaphrams work on vaccum ... if there is a split in them then the pressure differential will be ... well different ... and they won't rise/fall as quickly as they should.

Correct me if I'm wrong anyone ... not 100% sure about this but quite sure Confused

Will see if this guy has any spares Logan Thumbs Up

All the best ... Barry
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hmmmnz
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PostPosted: 16:36 - 15 Jun 2007    Post subject: Reply with quote
that would be great if you could barry Thumbs Up
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BanditsHigh
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PostPosted: 18:20 - 15 Jun 2007    Post subject: Reply with quote
hmmmnz wrote:
that would be great if you could barry Thumbs Up


No answer the first time but will keep on trying ... will let you know either way Smile

All the best ... Barry
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bish777
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PostPosted: 23:30 - 15 Jun 2007    Post subject: Reply with quote
BanditsHigh wrote:


The diaphrams work on vaccum ... if there is a split in them then the pressure differential will be ... well different ... and they won't rise/fall as quickly as they should.

Correct me if I'm wrong anyone ... not 100% sure about this but quite sure Confused

Will see if this guy has any spares Logan Thumbs Up

All the best ... Barry


my gt550 had two out of four split, but didnt drop revs more slowly, was just flat and rough at high rpm.
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BanditsHigh
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PostPosted: 06:40 - 18 Jun 2007    Post subject: Reply with quote
No reply to text either Logan ... so either the guy that gave me the number was bullshitting me, the number he gave me was wrong or the guy has since changed his number!!

Sorry mate ... Barry
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hmmmnz
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PostPosted: 06:51 - 18 Jun 2007    Post subject: Reply with quote
no worries barry, it was a long shot, thanks for trying Thumbs Up
ill give these fuckers a ring and hand over some hard earned cash Confused
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