Mikuni TM33
#31
09-12-2010 | 01:38 AM
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1st Gear Member
Joined: May 2010
Posts: 231
Back at the sea level from CO and quest for magical carb jetting continues.
I did more test runs today and among other things re-verified the fuel level, it is set to 14mm exactly as it should.
My configuration is still same as last time: FMF Q4, stock header, stock 250, TM33, Twin Air filter, stock snorkel.
- Pilot jet = 30 This is too small, at 1/8 -1/4 throttle the A/F is around 14
- Needle jet = Q-0. This is good, mid throttle is great.
- MJ = 120. I was using 117.5 but with that I got bit of stumble at WOT. 120 works great although A/F reads ~12 and from what I read at WOT you should be right around 13.
Next I'll get a 35 and 37.5 PJ and see what gives best on/off throttle response.
Now the high end is great but bit of lean stumble at off -> on throttle transition.
Also, there's a bigger header coming in from the mail and another muffler for parts for a "custom made" quiet but well flowing exhaust system.
--
Mikko
I did more test runs today and among other things re-verified the fuel level, it is set to 14mm exactly as it should.
My configuration is still same as last time: FMF Q4, stock header, stock 250, TM33, Twin Air filter, stock snorkel.
- Pilot jet = 30 This is too small, at 1/8 -1/4 throttle the A/F is around 14
- Needle jet = Q-0. This is good, mid throttle is great.
- MJ = 120. I was using 117.5 but with that I got bit of stumble at WOT. 120 works great although A/F reads ~12 and from what I read at WOT you should be right around 13.
Next I'll get a 35 and 37.5 PJ and see what gives best on/off throttle response.
Now the high end is great but bit of lean stumble at off -> on throttle transition.
Also, there's a bigger header coming in from the mail and another muffler for parts for a "custom made" quiet but well flowing exhaust system.
--
Mikko
#32
10-17-2010 | 03:24 PM
Member
1st Gear Member
Joined: Nov 2008
Posts: 33
TM 33/34 solved the "hard starting" but I lost the top revs.
It surges after about 8500 rpm. (The original carb would do 100mph {indicated}) runs great up till 8500 but won't go to far past 9000 before surging gets BAD Any advice ? Bill tuned it for my altitude ( Toronto CANADA ) New air filter and NGK plug.
Sincere thanks Marc
It surges after about 8500 rpm. (The original carb would do 100mph {indicated}) runs great up till 8500 but won't go to far past 9000 before surging gets BAD Any advice ? Bill tuned it for my altitude ( Toronto CANADA ) New air filter and NGK plug.
Sincere thanks Marc
Last edited by MADDOG07; 10-17-2010 at 03:32 PM.
#34
10-25-2010 | 05:30 PM
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1st Gear Member
Joined: Nov 2008
Posts: 33
Hello Mikko
Just followed the instructions that one of our fellows posted.
He (? I forget) put up a series of pics. They helped me a great deal. I'll try to find them again and show the thread here,.
Just normal instal w/the jet BILL put in it.
Thanks for your interest and I'm sorry for the delay.
Lazy you know...
Marc
P.s I just emailed J & B Blue at b_jblue@sbcglobal.net
Just followed the instructions that one of our fellows posted.
He (? I forget) put up a series of pics. They helped me a great deal. I'll try to find them again and show the thread here,.
Just normal instal w/the jet BILL put in it.
Thanks for your interest and I'm sorry for the delay.
Lazy you know...
Marc
P.s I just emailed J & B Blue at b_jblue@sbcglobal.net
Last edited by MADDOG07; 10-25-2010 at 06:40 PM. Reason: adding info
#35
10-26-2010 | 05:39 PM
Member
1st Gear Member
Joined: Nov 2008
Posts: 33
B. replied the next day. Seems a great guy!
says
If you are running the air box lid on & having this problem you will need to increase the main jet one step larger.
We think I'll be going to a 0.140 (?) main jet.
the schematic: http://www.mikuni.com/pdf/tm33.pdf
Part # 27
Hope I can simply rotate the carb in the boots to change it.
When I find the darn thing!
Any advice on this ...Do I turn it in snug..I'm no slouch but not a mech either
Good luck to all, Sincerely Marc
says
If you are running the air box lid on & having this problem you will need to increase the main jet one step larger.
We think I'll be going to a 0.140 (?) main jet.
the schematic: http://www.mikuni.com/pdf/tm33.pdf
Part # 27
Hope I can simply rotate the carb in the boots to change it.
When I find the darn thing!
Any advice on this ...Do I turn it in snug..I'm no slouch but not a mech either
Good luck to all, Sincerely Marc
Last edited by MADDOG07; 10-26-2010 at 05:41 PM.
#36
11-13-2010 | 02:13 PM
Member
1st Gear Member
Joined: Nov 2008
Posts: 33
Good day ALL
Thanks to B.Blue for the advice. I ordered both the 140 and 142.5 "large round head Mikuni main jets. Think I'll start w/the 142.5. It's a winter project.
I''l post the result when I get this stuff together
Thanks for all the help Sincerely Marc
Thanks to B.Blue for the advice. I ordered both the 140 and 142.5 "large round head Mikuni main jets. Think I'll start w/the 142.5. It's a winter project.
I''l post the result when I get this stuff together
Thanks for all the help Sincerely Marc
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