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I have a skyhawk 66cc motor on my bike an i have a new carberator the engine is new but it wont reach its full rpm an is vetry slow

I have pulled the c clip out of the carb as it was running rich an moved it accordinley an still no speed it almost feels governed what can ui do

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 492 Answers

SOURCE: Bogging engine 3400-4000 RPM under full throttle.

Sounds like one of the intermittant jets is clogged. Need to clean the carbs.

Posted on Apr 30, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: No Power at High RPM

Sounds like a fuel problem, possible stuck needle valve. Did you check for vacuum leaks? How about the fuel itself, did you treat it before storage to prevent gelling and varnish ? If not your entire fuel system may be restricted. Purchase a can of Seafoam...pour in 1/2 of it to a tank of gas, use the other 1/2 on the next tank. Change fuel filter afterwards because any foreign materials will be in the filter from the cleaning process. Third tank normal fill.
Good luck...i hope this helps.

Posted on May 19, 2009

  • 3567 Answers

SOURCE: high idle on start up with choke off.

This sounds like an air leak is making the fuel/air mixture too lean. Any air leaks between the carb and the head will lean the mixture. Old, hard and cracked rubber manifold parts are the usual culprits. Old gaskets and "O" ring seals can leak air also. A bad head gasket seal happens at times also, as does an exhaust valve not fully seating. Air leaks are the idle speed problem.

A different problem is likely present in the carbs and that is what is causing the rich fuel smell. The carbs must be balanced. Example > If three of four carbs are perfectly balanced and one carb is not, then the 3 are "driving" the 4th carb. This will cause gas to spit into the air cleaner from the "bad" carb and can cause a backfire or two. Special vacuum gauges are needed to balance the carbs. Also be aware the carbs must be scycronizsed as well. The slides on all four carbs must lift at exactly the same time when the throttle is cracked.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.

I don't get paid for my answers but I do take pride in them, and I am only trying to help. So if you will, > > A “very helpful” rating for these answers? Thanks!

Posted on Jun 14, 2009

  • 408 Answers

SOURCE: 97 srad no power under 4000 rpm in, in first gear acceleration

If you have installed the Dynojet kit's carburetor needles take them off and use the stock ones.
Dynojet's needles are for track use only and the don't work properly under 4000rpm.

Posted on Jun 15, 2009

  • 216 Answers

SOURCE: Gilera Nordwest Carb setting

I have a gilera RC 600 which has the same engine as the nordwest, the problem could be the carb needs to be stripped and cleaned and replace the foam air filter with a paper one. For accurate advice and spares which are quickly posted, contact BOB WRIGHT at 0044193451033. He is the official UK gilera specialist, tell him I sent you, say the guy in southern Ireland, and he will look after you. Good Luck.
PS please rate me if this helped

Posted on Jun 26, 2009

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