January 23, 20179 yr 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.
January 23, 20179 yr 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 ?
January 24, 20179 yr Check the jet block gasket. A failed, or out of place, gasket can cause both fuel and air leakage
January 24, 20179 yr 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, 20179 yr by axulsuv more info ....
January 24, 20179 yr Author 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.
January 24, 20179 yr 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.
January 25, 20179 yr Author 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.
January 27, 20179 yr 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!!!
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