TM 36-68 with a stock bore?
#21
01-09-2013 | 09:26 PM
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Joined: Jun 2012
Posts: 80
From: Seattle
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I'm installing my TM36, and aside from ordering longer cables, only have one question from you guys. A baseline jetting from anyone. I've got an FMF Q4 and powerbomb, just got a KDX snorkle and that's about it. I got the 9EBY01-50 w/a P6 needle jet. I have a 15 pilot (17.5 extra) and a main 125, along with the stock 130 and a 127.5. No idea of what to put in to start with, except on what you've all used...best guess. Any advice? We live in Seattle, very ugly weather right now, sea level. BUT, riding will eventually be up in the mountains when it warms up a little bit in spring. Oh yeah, stock engine right now, BB sometime next summer if that matters. Thanks guys.
#22
03-23-2013 | 02:39 AM
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Joined: Jan 2011
Posts: 419
From: North Shore of Lake Superior
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I got my carb parts today, so I plan to have the TM36-68 installed by Sunday. I don't know whether I'll get to ride much though, as it's still winter in these far northern reaches of Minnesota.
I'll need to modify the bellcrank to clear the Acerbis tank, and reroute the throttle cable.
This is where I plan to start:
Sea level, 250cc, KLX300R muffler w/o buttplug, Stroker/FSW type header, stock airbox w/o lid.
17.5 pilot
1.0 pilot air jet
P-6 needle jet
9EBY01-50 needle @ 2nd position
127.5 main
Pump set between 1/8 and 3/4 throttle
More to come...
I'll need to modify the bellcrank to clear the Acerbis tank, and reroute the throttle cable.
This is where I plan to start:
Sea level, 250cc, KLX300R muffler w/o buttplug, Stroker/FSW type header, stock airbox w/o lid.
17.5 pilot
1.0 pilot air jet
P-6 needle jet
9EBY01-50 needle @ 2nd position
127.5 main
Pump set between 1/8 and 3/4 throttle
More to come...
#23
03-23-2013 | 03:36 AM
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Joined: Sep 2009
Posts: 5,050
From: Abilene, TX
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Near as I can recall, I'm running a 125 main...15 pilot jet...a .09 air pilot...9EBY01-50 needle...P6 needle jet...don't recall needle position...pump set up as Mikuni recommended 1/8--3/4. This is on a KLX250 with 300 jug with full Muzzy exhaust and all airbox mods.
#24
03-23-2013 | 05:02 AM
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Joined: Apr 2012
Posts: 96
From: Marin County, California
Flying Finn: I've always felt our bikes had undersized carbs. I looked at the diameter of carbs or EFI bodies on many 250's and decided that a larger carb was worth trying. Can you please tell me what a TM36-68 is? What intake manifold and throttle cable are you using? Thanks.
#25
03-23-2013 | 02:39 PM
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Joined: Oct 2010
Posts: 4,507
From: SW Idaho
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I thought you were selling your KLX?
Looking forward to your results. I'm planning a 36-68 sometime soon.
Looking forward to your results. I'm planning a 36-68 sometime soon.
I got my carb parts today, so I plan to have the TM36-68 installed by Sunday. I don't know whether I'll get to ride much though, as it's still winter in these far northern reaches of Minnesota.
I'll need to modify the bellcrank to clear the Acerbis tank, and reroute the throttle cable.
This is where I plan to start:
Sea level, 250cc, KLX300R muffler w/o buttplug, Stroker/FSW type header, stock airbox w/o lid.
17.5 pilot
1.0 pilot air jet
P-6 needle jet
9EBY01-50 needle @ 2nd position
127.5 main
Pump set between 1/8 and 3/4 throttle
More to come...
I'll need to modify the bellcrank to clear the Acerbis tank, and reroute the throttle cable.
This is where I plan to start:
Sea level, 250cc, KLX300R muffler w/o buttplug, Stroker/FSW type header, stock airbox w/o lid.
17.5 pilot
1.0 pilot air jet
P-6 needle jet
9EBY01-50 needle @ 2nd position
127.5 main
Pump set between 1/8 and 3/4 throttle
More to come...
#26
03-23-2013 | 02:52 PM
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Joined: Jan 2011
Posts: 419
From: North Shore of Lake Superior
1st Gear Member
I appreciate all the tuning info that others have posted here and elsewhere...it'll shorten the tuning process immensely.
Last edited by Lutz; 03-23-2013 at 02:55 PM.
#27
03-23-2013 | 02:54 PM
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Joined: Jan 2011
Posts: 419
From: North Shore of Lake Superior
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#28
03-23-2013 | 03:28 PM
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Joined: Sep 2009
Posts: 5,050
From: Abilene, TX
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Have you leaned it out a little since your initial testing? I thought you were running a 127.5 main and 17.5 pilot, based on your Acerbis tank and TM36 carb thread. Oh, what needle clip position did you end up at?
I appreciate all the tuning info that others have posted here and elsewhere...it'll shorten the tuning process immensely.
I appreciate all the tuning info that others have posted here and elsewhere...it'll shorten the tuning process immensely.
I can't recall my needle position, but I think it's the same as Dan Moore and Mustang's.
#29
03-25-2013 | 09:47 PM
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Joined: Jun 2012
Posts: 80
From: Seattle
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I'm running the 125 main, 17.5 pilot and clip in the middle. Very rich at start up. Have to reduce choke quickly and start using throttle to maintain idle if you dump choke altogether. Otherwise you have to hold the choke out halfway. Either way it turned my plug black. Didn't think it was that rich. My settings are based on all of yours, but the bike came to a sputtering end yesterday. Soon as I switched out plugs, it was back to first crank starting. Still, I have to adjust some things...not sure what yet, but something.
Ran like a champ for a while though. Got a rad. hose issue, so I rode it to my local dealer, still under warranty, so we could set up a date. Next ride was fine too, then blammo!
Ran like a champ for a while though. Got a rad. hose issue, so I rode it to my local dealer, still under warranty, so we could set up a date. Next ride was fine too, then blammo!
#30
03-27-2013 | 01:00 AM
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Joined: May 2011
Posts: 19
Maybe to long and far gone. By 9EBBY-51 do you mean the 9EBY01-51? Your using a 115 MJ. This is a Mikuni jet right? Which would about equal my 122 DJ according to http://www.4strokes.com/tech/carbjetxover.asp ?
Unrelated -Has there ever been a studies for this bike to be 100% stock before adding a tm36-86? Absolutely NO airbox/lid, exhaust, engine, gearing changes and assume to be at sea level? And to stay at the stoichiometric level of 13.1 Air
Unrelated -Has there ever been a studies for this bike to be 100% stock before adding a tm36-86? Absolutely NO airbox/lid, exhaust, engine, gearing changes and assume to be at sea level? And to stay at the stoichiometric level of 13.1 Air
I'm just using this thread as my personal log of my jetting, easier to find this than some hand written notes on back of notebook...
With my previous jetting the bike ran REALLY well except for slight lean area at very small throttle, I'd say between 1/8 and 1/4.
Even that was only noticeable on the A/F meter and probably gave me really good cruising fuel mileage.
My guess was that at that point the jetting is mainly set by the constant diameter section of the needle and ID of the needle jet.
I was running 9EBBY-50 needle with P-4 needle jet.
Straight forward option would have been to go to P-6 NJ but I don't have one at hand. But I did have 9EBBY-51 needle which is one step leaner than the -50.
So I decided to try the 9EBBY-51 with P-8 needle jet. -> Excellent results!
It is clearly richer than -50 with P-4 at the constant diameter area so I went down to 15 Pilot Jet.
Now I have idle A/F ~ 13.5 to 14
Small throttle A/F under load ~12.5
On very small, or no throttle, pretty much on decel the A/F goes up to 11.
WOT at full RPM is also around 12.5
For my own record:
PJ = 15, MJ = 115, 9EBBY-51 clip @ top grove, NJ P-8.
For TM36-68 jetting reference, Id say the two needle combos that work just super well on this bike are:
9EBBY-51 with P-8 needle jet and 9EBBY-50 with P-6 needle jet.
All jetting testing is done riding the bike with LM-2 A/F meter hooked up.
--
Mikko
With my previous jetting the bike ran REALLY well except for slight lean area at very small throttle, I'd say between 1/8 and 1/4.
Even that was only noticeable on the A/F meter and probably gave me really good cruising fuel mileage.
My guess was that at that point the jetting is mainly set by the constant diameter section of the needle and ID of the needle jet.
I was running 9EBBY-50 needle with P-4 needle jet.
Straight forward option would have been to go to P-6 NJ but I don't have one at hand. But I did have 9EBBY-51 needle which is one step leaner than the -50.
So I decided to try the 9EBBY-51 with P-8 needle jet. -> Excellent results!
It is clearly richer than -50 with P-4 at the constant diameter area so I went down to 15 Pilot Jet.
Now I have idle A/F ~ 13.5 to 14
Small throttle A/F under load ~12.5
On very small, or no throttle, pretty much on decel the A/F goes up to 11.
WOT at full RPM is also around 12.5
For my own record:
PJ = 15, MJ = 115, 9EBBY-51 clip @ top grove, NJ P-8.
For TM36-68 jetting reference, Id say the two needle combos that work just super well on this bike are:
9EBBY-51 with P-8 needle jet and 9EBBY-50 with P-6 needle jet.
All jetting testing is done riding the bike with LM-2 A/F meter hooked up.
--
Mikko