sleeper06

Get rid of the twist and buy a cable for pwks with a thumb throttle,I know people that hurt themselves with twists on a 250r

Start rich at 360 you could be close,27.5 pilot

Def up that pilot,chuck the tors,check your coil,did you adjust the bottom of the ports for the crank?Ohm out your plug caps to rule out ignition,pressure test it to rule out air leak,with the lid on I cant see you in the 3s at all

A drag ported stock stroke cub will tear ass,there is just more capability in the 421 set up,hp will lower along with the torque curve

Sounds like electrical problem,plug caps, coil,something frayed in harness with bad connection,I cant imagine stock carbs giving you that much trouble,too me there set it and forget it,is there shit in the gas tank

When you try everything and it all checks out with the ohm meter try swapping the fly wheel,I have seen alot of shit go wrong but twice in ten years I had flywheel throw me 4 a loop for days,checking and rechecking,shake it if it sounds like loose rocks,or pick-up isnt rite,magnets come loose.Give it a whirl

I know they make one for a 40 over blaster piston but I think its a 398,In my opinion the durations of the port are to large for the added stroke,last time I degreed one it was on the high end.You would also need to cut the domes if the piston comes through the deck

It all depends on your port heights/widths,155 is max psi on pump gas that I would go,put them in and take a reading

You will prob end up around 340 main,30 pilot,aftermarket needles(i have gotten stock ones tuned out but also have had problems)Start at 360s work down, you might need smaller domes but 19s might put you in race gas territory depending on how your transf/exh are cut, you need to do a compression test when assembled to be sure ,I run 32:1 even on my drag bikes just my opinion tho

start by taking clutch cover off but if one of your shift forks bent or broke it can have same effect and you will have 2 split the case

52 pilot 155 main is safe but stock port dont be suprised if you end up going down into the low 140s

350 mains are safe as long as the port isnt too aggressive,27.5 pilots

I feel ya

I ran 30 pilots w/fattys they like big pilots,I had no lid on 280 mains stock needles all the way rich

Smokin deals bro,bump for a great guy

Cool you have always been a help with all my questions

I wasnt talking about tedders I was talking about yours on gas ,didnt mean to offend you but i saw your slip posted here I didnt know you were not posting them up anymore.

Find out your exhaust duration as you could be set up for PCs

Jeff has helped me jet numerous raptors,his jet kits and set up have been spot on,gytr needle makes a huge diffrence too,i can look in my notes if you cant get a hold of him but he is definitally good with raptors

Stock port cub 20cc domes 185 kicking sea level 68mm bore,I have also had custom cut domes that gave weird readings did you purchase everything as a package or pick the domes up seperate or special.Did you check the squish

I picked it up for 1250,carbs and all,no overide though

Sound like a coil or plug cap problem,or problem in harness ,start simple

So your bike is in the 11s with that mph

Those guys amaze me with there times,it gives me proof it can be done

Bigger isnt always better ,people turn low 10s in the 1/4 with a stock stroke cub on gas