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Restrictor in Derbi Gpr 50 Racing carb?

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Leon.Smith20
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Joined: 03 May 2011
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PostPosted: 16:30 - 03 May 2011    Post subject: Restrictor in Derbi Gpr 50 Racing carb? Reply with quote

I was removing my air box the other day and i noticed a gold plate with holes in it covering the end of my carb. I have added a photo so you can see, i was wondering if it was a restrictor. If you do know please tell me Smile
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LittleTomos50
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PostPosted: 17:12 - 03 May 2011    Post subject: Reply with quote

It does look like a restrictor to be fair. Some aprilia's had similar restrictions. does it come out easy enough? and can it be put back in once you take it out? I'd give it a shot, but that's me.
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computid
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PostPosted: 19:09 - 03 May 2011    Post subject: Reply with quote

No. I think its there to restrict airflow into the carb but not to retard the engine. If you remove it will run like crap. Most carbs have them, My GP1 has one and the Gixxer has a similar plate on the air inlet.
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dobby
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PostPosted: 20:13 - 03 May 2011    Post subject: Reply with quote

this is removed during derestriction,

derestriction process is as follows

remove brass inlet plate
remove exhaust restrictors the pipes (weld holes that remain) and the big washer near the header,
upjet to a 105 main jet and a 420 diffuser tube and needle,
and a 15t front sprocket is the derbi specifications for derestriction
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hmmmnz
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PostPosted: 20:13 - 03 May 2011    Post subject: Reply with quote

computid that is the dumbest thing ive heard today (its only 7am so don't feel too bad)restricting the air flow is the same as restricting the engine
that little plate is what a restricter is in every sense of the word,
of course it will run like shit when you remove it, it has been set up to run like that, it will need to be re-jetted
most carbs do not have them, in fact in 25 years of riding and and over double that number of bikes ive never seen that particular way of restricting before
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dobby
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PostPosted: 20:20 - 03 May 2011    Post subject: Reply with quote

oh u need to change plug to a BR10EG aswell Thumbs Up hope this helps
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computid
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PostPosted: 21:12 - 03 May 2011    Post subject: Reply with quote

hmmmnz wrote:
computid that is the dumbest thing ive heard today (its only 7am so don't feel too bad)restricting the air flow is the same as restricting the engine
that little plate is what a restricter is in every sense of the word,
of course it will run like shit when you remove it, it has been set up to run like that, it will need to be re-jetted
most carbs do not have them, in fact in 25 years of riding and and over double that number of bikes ive never seen that particular way of restricting before


Sorry, I feel shit today and just got out of a 4 hour technical planning meeting Confused

Ive seen a few carbs with plates in the air inlet. Think I have one on my bench at the moment. Ill get a pic tomorrow.
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hmmmnz
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PostPosted: 21:20 - 03 May 2011    Post subject: Reply with quote

fair enough, i suppose its a derbi carb you have there??
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Leon.Smith20
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PostPosted: 22:12 - 03 May 2011    Post subject: Reply with quote

Yes its is a derbi carb for the Derbi D50BO engine. Thanks dobby for the help. Because i bought a gianelli exhaust for my bike and it didnt work, i rejeted it, put a new reed valve in it and put a performance air filter on it. And the exhaust still didnt work, the bike would just stay on 5 thousand rpm and wouldnt move from it :L So i think i know what is wrong Smile
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Leon.Smith20
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PostPosted: 22:22 - 03 May 2011    Post subject: Reply with quote

Oh yer, what do you meen by difusser tube and needle? And how many teeth on the rear sprocket? Have you had a derbi before?
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Rob Fzs
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PostPosted: 22:38 - 03 May 2011    Post subject: Reply with quote

Leon.Smith20 wrote:
performance air filter


get rid,probs need jetting up

the diffuser i'm guessing is the tube the jet screws in to
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