Decided to go down the TM45 path and had her out last weekend for some testing. I bought the carb through Hightower(great bloke to deal with and could not ask for anymore as far as setup and spring mod etc) and she come jetted with a 160 main. I kept putting larger main jets in after each 2 hour ride and the better the bike went each time. Hightower said he has not heard of a stock bike needing bigger than a 170 main, which is where I am now. I am going to try bigger and see how she goes, has anyone have bigger than 170 mains in there TM45?

BTW my bike is stock, no airbox, endcap. TM45, and ported intake and I am at sea level.

Are the thumb ext for the throttle any good?

Gav

 

I found my sweet spot was with a 165 jet runing a stock snorkle with K&N in a open top air box. (check my pics)

The 160 jet was fine till I put in a 11.5-1 comp piston, mild head porting and ported intake. I run my TM45 @ Armagosa 3300 ft. Also ran it at 1000 ft. The most I had to to do in that altitude change was air fuel screw adjustment.

Running a 170....I tried that and it did seem to run great but...after awhile (30 minutes) it did foul the plugs.

From what I have read and heard from Hightower, a stock carb (I ran a 175) needs a bigger jet than a TM45. Differences in the vacuum handling. If your not running the snorkle tube you should be running even a smaller jet! I know it seems opposite....

***Remember to be testing these jets under a long load.....like a good hill climb. On flat ground you wont notice much. On the hill, watch your RPM's or just race another quad to see .***

Hightower helped me with my fine tuning after my mods, he knows the TM45 I would bet better than anyone else on here. If your running a 170 I would bet your plugs are fuel soaked. 160 should be very close to your setup.

 

Are you running the accel. pump (on) ? I am also trying to dial in my tm45, I havent gotten that large on the main jet even with all my mod's @ sea level. ( though I might try )

 

No pump

 

I am running with pump on, as set up by Hightower, I have run with the 170 main for 2 days riding now and no problems at all, bike pulls harder than ever before. I have not had the plugs out to check. Only seat of the pants tuning but I am now getting infront of my buddy's 700r with slipon. powercommander etc, which with the 160main this would not happen and that is over 8/10 different drags. we have no long hills to climb (max 100ft) so most of the tuning is on the flats, some of the beach runs last weekend I could get to the rev limiter in 5th gear easily.
Hightower emailed me and said I should try 175 or 180 main to see what the outcome is[img]i/expressions/face-icon-small-wink.gif[/img]

BTW my freinds with the 660 raptors luv it when I get back to base and say I am going to change my main jet(all of about 2min work)

Gav

 

i'm running a 170 main, my bike seems to like it alot with mods listed below. my plugs look pretty good too