that's what im using newoldstock... racing fuel 110 octane and thanks vwfan97 I will get what u said and just wont a good one. Its just at a dead stop when I put it to the floor it wants to bog down like no power then once rpm comes up its ready to scream don't it sound like a carb issue to you all to this happens within like 3 seconds then it wants to scream seems like it didn't really do it that bad when I first took off on it to break it in I know it has good compression bout tear my damn arm off sometimes trying to start it cuz the rope pulls hard out of my hand an its a new motor not barely over a week old if its not carb what else could it b. im still getting carb to tho just wanna get this straightened out it could b my clutch to u think because its just a max torque clutch with 14 tooth the 56 dollar one arc
Big carbs have poor low speed performance.
I have worked at this an its real hard to fix.
Its a velocity issue, air blowing threw is too slow relative to venturi and throat diameter.
when you open it right up the velocity picks up faster than the fuel flow.
Its a game of catch up until you cam pull the fuel along to get it to run decent.
A couple of fixes:
higher idle speed and richer mixture on the low side.
Your going to have to tap the throttle to keep it from drowning out at low speed with all that fuel.
I have that issue and can't say there is anything else to do.
Racing carbs do not idle.
Race engines race.....
When your running it ( actual race ) and you get off the throttle the high vacuum you pull draws a rich mixture into the engine.
When you come out of a corner or down a hill the engine is loaded down with fuel.
Your primed for the next time you crack the throttle wide and no bog.
But if your just coming off the idle and your set lean for a clean idle you lack that cushion of extra fuel.
Watch the drag bikes on Anna street videos.
All the guys are tapping the throttle and you can hear how fat the mixtures are.
Modified Karts same thing especially the ones running tillotsons.
They need to lean up for the parade laps and warm up.
But if you watch once they are ready to drop the flag those low speed circuits are set real fat again.
On a yellow when they have to drop back and cut the power the drivers are all tapping the throttle to keep the plugs clear adn keep from drowning...
If you have a tillotson carb dialled in correct and everything is working just right that is the closest thing to fuel injection out there.