Yes another jetting issue. Tnt 19mm carb need desperate help

Before you say read up about jetting. I have a thousand times but i need help with my bike. So, i have a tnt 19mm carb. Yes i have been told they are ****. Has a malossi air filter. Got it jetted by mechanic he said its best with 88 jet. It bogs when you open throttle fast. So i dropped the needle and it almost fixed the problem. The bike isnt that fast and doesnt lift (despite the good spec which i will mention later). I put a 92 jet in and literally no bog. Runs nice. But still only hitting 55ish. Put a 95 jet in and it runs nice but hesitates after a while when the engine is hot. Im thinking of putting my old 17.5 carb on with airbox. Would this be better?

Rough spec of bike
Typhoon engine. Malossi sport 70. Pm360. Tnt19mm carb with malossi air filter(as mentioned). Full malossi transmission with white spring and 6g rollers (seems to rev too much with 5.5).
Also would a worn belt and/or soft clutch springs have a big affect on speed. Why the f is my bike so slow. Standard de restricted 50s can go this fast ffs!

 

Also i been told to put a bigger jet in. Despite it running better with 92 than 95

 

Thanks. Ran shizzle with stok carb and box feels like a 4 stroke takes ages to kick in. Got a 90 jet at the moment il try 85 mate. Also ive been messing with clutch springs and the bike lifts a lott nicer but only with 7g rollers

 

Also how comes many 70s run fine with 100 jet

 

Hmm yh fair enough. With standard clucth my bike ran nicest with 5.5 but revved alot. Now i got 50% increase om clutch springs and +1500 contra it runs nice with 7g and that seems heavy. Whats your input?

 

What do u mean by sus haha and i was thinking of putinn the +1000 spring on and going lower on the rollers Standard contra is way too soft man and people keep sayin have medium springs. I remember with standard clutch and 5.5 it was decent would lift if held brake n stuff but still felt like revvin like a biatch

 

Also green polini springs 35% felt shizzle the yellow 50% ones are in at the moment
Feel quite nice

 

Yeh im convinced the clutch springs are fine. I put 88 jet in and raised needle as when its droppd (leaner) it chokes for a sec, the bikes running slightly rich on quarter throtttle but to be honest i dont mind. And i understand what u are saying but at the same time the bike is lifitng a lottt nicer with the stronger spring but ima put in a softer one and lighter rollers but when rollers too light the bike sounds like itl blow up dudee

 

Good advice here, stop messing with the carb and do what this man says! Your sort it a lot quicker!!

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Ok i put in a softer contra and 6.5 rollers (.5 lighter) and the revs drop and are a bit jumpy at full revs. Kinda feels like carb but i know its not. Ima try even lighter rollers but can honsetly say it felt better with the stronger contra

 

The roller weights sound wayy to heavy to me tbh

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Same i used to run 5.5s but with the stronger springs i cant

 

What about going to the softer spring and 5.5's or even 5's?

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clutch springs should only be an issue for the first few seconds of take off

So any roller can be used with any spring choice as such as neither will effect the other.

right start with the basics, take the contra spring out and fit the stock

you say you like the yellow spprings, leave them in it will jest rev much higher on take off, remeber revving dosent equal power. to get power you need to find your bikes sweet spot in the rev range and aim to get the clutch springs and variator to stick too this!

rollers wise i cant help as i have never run a 70 but go with what others run as a base guide, you will know how they perform by driving it, if after 5 seconds of take off the bikes revs sound low at full throttle then go lighter

if after take off (5-7) seconds should see you well onto the variator) it revs too high but dosent pull go heavier



Also check belt thickness against how wide it should be

jetting wise if you have a jet it runs on and dosent bog stick too it for now while you sort the above out

 

Thankss mate and i hear people running 4.5 g rollers which is stupid light 5.5s are nice on take of then just rev out. Also someone tried nick my bike with the lock on te back wheel. I cant move my bike now it seems the clutch is stuck engaged. Cant start bike without revving or it wil cut out