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Post Info TOPIC: DEP exhaust (rejetting)


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DEP exhaust (rejetting)
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Has anyone rejeted after fitting a DEP expanny.
After reading about seikis unfortunate avents recently its got me thinking if mine might be running to lean.My bike runs at its best with the mixture wound right in tight and it has the standard jet in it with a DEP fitted.
What sizes have you lot fitted with your DEPS and do you find you have better results.

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The recommendation from adrenalin pedstop is that standard jetting is used, although they do recommend a plug check as extreme conditions might need a richer jet. The mixture screw only controls low throttle settings, but the fact that yours is wound right in might suggest that the airbox is not standard??

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Havent riden myn yet , soon :)

Got a , 240,230 main jet i think .FUll dep

But the barrel is 58.40mm , sd is 56.00.

So that should give the barrel that extra petrol , and 2 stroke protection :)

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It was suggested I run a standard jet too, I honesly beleive it was my oil pump that packed up causing he issues mate.

It will have to upjet now and these are the sort of questions ill try and ask the experts

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Airbox is standard,with snorkel on.
It runs fine but splutters abit at top end.Ive reconnected the speedo reed valve and taped it up and moved it away,this might help but im yet to give it a good run.
Has anyone had splutering and bogging and found a bigger jet has cured the problem,im trying to find a jet number that other riders agree on.
Its weird because if my mixture screw is wound right in its saying its to rich,but it doesnt like it if i wind it out 1 turn,so a bigger jet as suggested might make it worse.
Any advice.

-- Edited by carl13671 on Saturday 29th of January 2011 10:37:27 AM

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if the screw is in all the way i always thought theres to much air getting in and not enough fuel, so i put a bigger jet in and the screw can come out more. am i right ?

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Thats the way im thinking.

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I got myne up-jetted for the full DEP exhaust mate. I fitted the DEP with standard Jetting and the plug was the wrong spark colour....in the end it was 4 jett's above the original jett's biggrin

Hope this helped you out mate wink

-- Edited by CooS on Saturday 29th of January 2011 01:56:23 PM

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was you having any problems before you changed the jet apart from the plug colour?
Was there any difference when the jet was changed

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The way the carb works is that the screw on the side of the carb and the pilot jet only control the mixture up to about 1/4 throttle. From 1/4 to 3/4 the mixture is controlled by the needle on the bottom of the slide and then the main jet controls things from there up to full bore. Hope this helps sorting it out.

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carl13671 wrote:

was you having any problems before you changed the jet apart from the plug colour?
Was there any difference when the jet was changed




Yes i was mate it was spluttering at top speed....if i didn't jet up im pretty sure it would have seized my top end after a while no



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Photo1390.jpg

Ta mate,
I went out yesterday after i had put the reed switch back in and it seem to run alot better and the spluttering has stopped,this might of been the problem.I gave it a 32 mile run and a bit of a caning and it seems fine.Hope the roads stay dry and i might get out a bit more.


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carl13671 wrote:

Photo1390.jpg

Ta mate,
I went out yesterday after i had put the reed switch back in and it seem to run alot better and the spluttering has stopped,this might of been the problem.I gave it a 32 mile run and a bit of a caning and it seems fine.Hope the roads stay dry and i might get out a bit more.




Nice one mate, and i know but all the bad salt has cleared off the road know.....i had to clean my DEP every-time i got home because it was just rusting the hell on the header pipe no



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i've had to respray my spannie once a week atm with all the salt eating at it lol

-- Edited by fuggie on Monday 31st of January 2011 12:34:54 PM

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Would it not be possible to just drop the circlip down a notch on the carb needle to allow more fuel in instead of a bigger jet, or would this not be sufficient?

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When i went out at weekend everything seemed ok,so im going to do a plug chop in the next few days and see what flavour it is then decide about the jet.But it did cross my mind about the needle valve.Im thinking i might drop the front sprocket a bit,im curious what difference that will make.

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