breagh Posted January 23, 2017 Report Share Posted January 23, 2017 It's an odd one this but any ideas welcome. Old Fantic Section with an OKO carb was running fine but after a wet trial decided to clean carb. Blew out pilot / main etc and now the bike barely runs it's getting a massive amount of fuel. Float needle valve untouched and the carbs not flooding.floats working as they should. Needle looks fine . Really can;t think what's causing this must be something basic to be this far out. Go tell me what i've done wrong and I'm an idiot. Quote Link to comment Share on other sites More sharing options...
baldilocks Posted January 23, 2017 Report Share Posted January 23, 2017 Ive had that problem before, the pilot jet was still on the bench... Or its not been screwed in if you assembled it upside down and it's lying in the bottom of the float bowl ? 1 Quote Link to comment Share on other sites More sharing options...
nh014 Posted January 24, 2017 Report Share Posted January 24, 2017 Check the jet block gasket. A failed, or out of place, gasket can cause both fuel and air leakage Quote Link to comment Share on other sites More sharing options...
axulsuv Posted January 24, 2017 Report Share Posted January 24, 2017 (edited) A blow gun can unintentionally , destroy the jet block gasket as above ... But make sure you have a proper new one before dis assembly ! They are a wee bit finicky ,but when set up correctly , work quite well . (IMHO) Glenn And the original float needle valve in mine got replaced with a kehin one , Hardly perceptible flaws in it and it would spew fuel at the most unwelcome moments ... Found pinholes with a magnifying glass ... Worked fine about 70% of the time from new and then would suddenly be way rich , or dump fuel ... And then be fine again , pulled out what little hair I've got getting that one cured ! Not a issue since :):) Edited January 24, 2017 by axulsuv more info .... Quote Link to comment Share on other sites More sharing options...
breagh Posted January 24, 2017 Author Report Share Posted January 24, 2017 Cheers folks funny feeling you're right about this jet block gasket. I didn;t hold back with the air line. It wasn't running consistantly at the trial so pehaps it was dodgy anyway. Thanks again just have to find out who's got spares now. Quote Link to comment Share on other sites More sharing options...
slats10162 Posted January 24, 2017 Report Share Posted January 24, 2017 good article on here for oko http://www.mid-atlantictrials.com/OKO.html Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted January 24, 2017 Report Share Posted January 24, 2017 Tuning could get a bit expensive - it says the final fine tuning step (after adjusting the needle and jets) to sort the transition from pilot to main circuits is to change to a different bore size. Too bad if you start with the wrong one. Quote Link to comment Share on other sites More sharing options...
breagh Posted January 25, 2017 Author Report Share Posted January 25, 2017 Certainly a red face job, there's a small "jet" which sits above the main jet nozzle which I was totally unaware existed. This was lying on the garage floor which a oko supplier told me it would be . Certainly a prize puddin of the week on TC award due. Bikes spot and and for the record miles better than all the modified twinshock Fantics that folk spend £1000s on. Shame the Sections only worth 50p and 3 Barrs bottles. 2 Quote Link to comment Share on other sites More sharing options...
smokey125 Posted January 27, 2017 Report Share Posted January 27, 2017 On 25/01/2017 at 8:54 PM, breagh said: Shame the Sections only worth 50p and 3 Barrs bottles. Wish I could find a Section for 50p and 3 Barrs bottles!!! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.