TS1-225 JL3 TMX 35 jetting

[alanscottj]

I'm having a play with a TMX35 carb on my TS1 and love the carb and how it accelerates etc very nice indeed. My jetting can't be far out (plug not quite brown but more a mix of greyish/black) but I am thinking my main jet is very big, it's on a 370 and no sign of getting boggy, is this normal? I have pressure tested my engine and no signs of leaks.

To date my carb has:

Main 370
56 needle middle clip

Air screw 2 turns out.

Any thoughts?

[Grumpy225]

When I had my Ts1 225 (TMX35, Taffspeed Mk3 exhaust) it was running a 300 main jet. Open mouth at 400' asl.

56 needle sounds right

what pilot jet?

[alanscottj]

When I had my Ts1 225 (TMX35, Taffspeed Mk3 exhaust) it was running a 300 main jet. Open mouth at 400' asl.

56 needle sounds right

what pilot jet?

20 pilot I think (not 100% need to check tomorrow)

Thanks

[Toot-oasc]

370 main jet seems massive on a std TS1?

I run a 340 main, 20 pilot, 53 needle on the 2nd clip, with a Taffy exhaust (on a std TS1)

Just bought a brand new TMX35 to replace the one I've had on for 6 years, and as I've bought a new exhaust I'll be having the scoot dyno'd again before the season starts in a few weeks. I expect the main jet may possibly go up to 350, but not as large as a 370.

[alanscottj]

370 main jet seems massive on a std TS1?

I run a 340 main, 20 pilot, 53 needle on the 2nd clip, with a Taffy exhaust (on a std TS1)

Just bought a brand new TMX35 to replace the one I've had on for 6 years, and as I've bought a new exhaust I'll be having the scoot dyno'd again before the season starts in a few weeks. I expect the main jet may possibly go up to 350, but not as large as a 370.

I have spent the evening reading up on spark plug colour/doing plug chops. It would appear that I have been reading my plug wrong, I have been concentrating on the white porcelain part, which hasn't been changing much as I have increased the jet. Having done a bit of reading on the subject I can see that my plug was probably ok at around 340 main and is now on the rich size. I'll try and get a photo

[bazza3004]

My mate road runner ian (on here) has similar set up to yours and think hes running a 320 main although he runs with a filter.

[drunkmunkey6969]

325 main, 25 pilot, 56 needle, 2nd clip.....should be very close. Finish off with plug chops and/or Dyno sessions.

[alanscottj]

325 main, 25 pilot, 56 needle, 2nd clip.....should be very close. Finish off with plug chops and/or Dyno sessions.

Thanks for the jetting advice, I have done what you suggested apart from I have a 320 in there as I haven't got a 325. Scoot runs great and did a plug chop on a dual carriage way going up hill so under a fair bit of load:



What do you think?

[roadrunnerian]

hi I run a ts1 with a tmx35 20 pilot 330mj 55needle2nd clip was what I got when dynode open bell mouth and in winter I put an air filter on and ran 315mj and 57 needle 2nd clip all through summer and it ran great

[alanscottj]

Went up to a 330 main tonight, runs great, CHT and EGT still relatively low (120 and 450) and the plug looks like this: