my 1/8 throttle that came with the carby, although wen i turn it, it still turns 1/4?? diconected.
oh also did the muffler mod today, only took a 100mm off just to see wat its like ( i can always take more off later) after chopping through with the drop saw i notice have cut off the lil restrictor with tin plate inside it inside the the inner perphirated tube, was i supose to refit that or leave it out,making it a staight through muffler??
Not sure about the throttle... mine is a definite 1/8 turn from closed to wide open.. it may differ once the carby is connected, as the throttle i would imagine, is designed to work with a range of carbys, having different slide travel heights... see how it goes once fitted, and even still, a 1/4 turn will work fine.
As for the muffler, i'm not sure about the restrictor plate... Mine was literally a straight through job... No restrictors in there at all, just the perforated core all the way through, with no other baffles... May explain why mine has around the same decibel level as the 450 at WOT... is your's pretty quiet stock? mine's always been loud, without being overloud, if that makes sense... but no, leave the restrictor plate out.
It's an off-road bike only, so you have 98 decibels to play with til it's considered "illegal"..
just wondering thump what jetting was in you 28mm oko and what was it doing when fitted,just so i have a bench mark to start with .
Retrac when i fitted the 28mm to my Blitz, it was running the same jetting that i run in the 140 Lifan i pulled it off. Oddly, the 140 runs clean from idle to redline with a #k39 pilot jet, #k102 main jet, and the needle set on the middle clip. Yes, this jetting would be considered massive for a little motor, but is a set up that works. This is what got me thinking that despite the fact they are BIGGER jets than the jetting baseline i run in the 26mm on the Blitz, it still had symptoms of running LEAN. Crackly and backfiring off idle, but clearing out once on the needle and main... So theoretically, a #K42 might be a better pilot jet to run, with a #k104 main jet....
HOWEVER, OKO's, particularly the 28mm, have a weird tendency to exhibit symptoms that are actually OPPOSITE to the problem.. ie: when i was tuning my 140, it seemed like it was running lean jetting, when it was actually very, very rich.. It had a #K44 pilot, and a #K135 main jet when i first got it, and bottom end response was HUGE, but it wouldnt pull into the top end/WOT.... So i dropped the main jet down to #K102, which sorted out the WOT problem, but i lost all bottom end response... I then tried a heap of pilot jets, finally settling on the #K39. Still not great, as the bottom end response is a little doughy/hesitant, but it's the best working setup for the 140... Even though the 140 is highly modded in the breathing department, the 250 *should* still breathe better, so when i did try the 28mm on my Blitz, i'm still going with the jetting being a bit lean...
It seems however, that everyone who has tried the 28mm, hasnt been able to tune the bottom end properly... the hesitant doughiness down low seems to be a trait restricted purely to the 28mm... i'm still yet to find, or hear of a solution to tuning it perfectly, other than to use a 26mm in the first place.
Not to rain on anyone's parade, being someone to do things the hard way myself, but i think you will have more luck with a 26. having said that, if you persist with it, and find a way to get the 28mm running perfectly, i'd loce to hear it.
