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Post by billbott on Apr 8, 2007 14:06:07 GMT 1
The bike is now finished.  Starts first time every time. Ticking over nice and even at 1250 rpm, but its struggling to rev above 4500rpm, just splutters. Running large can microns, standard air box, 230 mains, needles in the middle groove, air screws 1.1/2 turns out (makes no diffrence no matter where they are). Any suggestions - too rich  - cant do plug chop cos it wont rev |
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Post by K.B on Apr 9, 2007 8:24:58 GMT 1
I had this on my RD250 LC and it was the crankshaft oil seals that where gone.
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Post by billbott on Apr 9, 2007 10:23:19 GMT 1
They are brand new - so doubt it??
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Post by Dirtbag on Apr 9, 2007 12:10:38 GMT 1
Try putting the needles in the second slot from bottom and upjetting to 240's or 250's.............Sounds like a fuelling shortage to me
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Post by billbott on Apr 9, 2007 12:22:27 GMT 1
Try putting the needles in the second slot from bottom and upjetting to 240's or 250's.............Sounds like a fuelling shortage to me Does this make it richer - the lower the clip, (the higher the needle) the richer it gets? |
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Post by Dirtbag on Apr 9, 2007 12:40:28 GMT 1
Yeah...it will richen it up ....but adjust the mixture screw to compensate
sounds to me like its getting not enough fuel , jetting with Microns is a real pain....as I well know.....best going up at least 2 jet sizes with them , fitting reed block extensions helps too mate. Personally I prefer the K&N's.....theyre bit of a pig to set up initially , but once done...wow
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Post by billbott on Apr 9, 2007 12:44:44 GMT 1
Yeah...it will richen it up ....but adjust the mixture screw to compensate sounds to me like its getting not enough fuel , jetting with Microns is a real pain....as I well know.....best going up at least 2 jet sizes with them , fitting reed block extensions helps too mate. Personally I prefer the K&N's.....theyre bit of a pig to set up initially , but once done...wow Mixture screw You mean the air screws In or out to make richer Dont remember having all this trouble back in 1985 - mind you, allspeeds where the pipe of choice then £99.99 - wish they still were that price  |
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Post by Dirtbag on Apr 9, 2007 12:57:18 GMT 1
Try turning the air/mixture screws in half a turn after upjetting.....I think this will get you closer to your goal
In to weaken.....out to richen , always try to do a plug chop even if it wont rev up to full tilt....that way at least it will give you some idea as to what is happeneing inside......coffee coloured deposits are good , the light biscuit colour is supposed to be ideal.....but I always try to go a shade richer.............minimizes seizure risk.
Trial and error mate with jetting....good luck and keep us informed
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Post by billbott on Apr 9, 2007 13:04:00 GMT 1
Cheers for that , Dirtbag - rains stopped play today (as well as the neighbours) will keep you informed.
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Starts first time every time. Ticking over nice and even at 1250 rpm, but its struggling to rev above 4500rpm, just splutters.
- cant do plug chop cos it wont rev 
