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Mikuni TM38 flat Q4s

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Mikuni TM38 flat Q4s

PostAuthor: Jeff0133 » Tue Jul 10, 2018 9:07 pm

How do you change the needle jets? Want to put Q4s in my tms but they seem to be pretty well stock in there...do you just pull on them with pliers?...I don't want to fck this up
Last edited by Jake on Thu Jul 26, 2018 5:31 pm, edited 1 time in total.
Reason: Thread jacked, split to new thread
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Thu Jul 12, 2018 12:53 am

You drive them out from the float chamber-side (GENTLY). Remove the washer between mainjet and the needle-jet casting and re-install the mainjet two or three turns. Normally some gentle tapping with the back of a screwdrive will unseat it. Them remove the main-jet and it should fall straight out.

When installing the new one, take not, that there's an alignment pin in the bore, which you have to align with a groove on the needle jet.

Hope this helps
Greg
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Thu Jul 12, 2018 6:07 am

Ok thanks, it is pretty solidly in there, didn't want to use too much force and crack the carb itself...
Now..the carbs keep wanting To pop out of the boots...Anyone else have this issue?
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Needs love but I like'em that way...
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Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Thu Jul 12, 2018 7:25 am

Tighten the clamps on the rubbers and sync 'em.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Thu Jul 12, 2018 7:59 am

Things is...I an bottoming out on the clamp.
Mayne i'll try a plumbing...wormscrew style clamp.
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Bike year & model: 1994 xv1100 basket case clean title
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Needs love but I like'em that way...
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Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Fri Jul 13, 2018 10:05 am

The wormscrew thingys worked...no more sucking sound from the boots or carb being pushed out so...that's good.
Starts first stab of the button,idles strong albeit fast.
Stutters and gets "flat" at 3/4 to WOT.
Needles at highest.mixture screw 2 turns out.
... suggestions?
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Bike year & model: 1994 xv1100 basket case clean title
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Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Sun Jul 15, 2018 3:05 pm

Unless I am terribly mistaken, the mixture screw is an airscrew on the TM (it definitely is on the VM), so try turning that in by half a turn as a start.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Sun Jul 15, 2018 4:14 pm

Ok, will do.ordered 250 main jets and a Q4 needle jet as well from mikunioz...waiting on those.
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Bike year & model: 1994 xv1100 basket case clean title
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Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Thu Jul 26, 2018 6:08 am

So i got the Q4 needle jets and the 250 mains from Mikunioz...put them in , raised the clips on the needles to middle position, 1-3/4 out on mixture.
Starts first stab,idles strong, falls flat on its face and stutters past 3/4 throttle...
So i'm thinking put the needles to highest position...could float height cause this?
What about mixture?...would i benefit from turning a little more outwards?
Synching is still...mehh...could it be just that?...a combination of all of the above?
Feel like i'm grasping at straws in the dark...blindfolded...
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Bike year & model: 1994 xv1100 basket case clean title
94000km
Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Thu Jul 26, 2018 9:35 am

Sounds like mains are way too big.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Thu Jul 26, 2018 10:13 am

Waiting on better weather(been pissing like cows here)...but i'll give it a go like that...then i'll maybe go back to 230s...
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Posts: 16
Joined: Sun Jun 12, 2016 9:24 am
  Flag
Bike year & model: 1994 xv1100 basket case clean title
94000km
Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: Jeff0133 » Thu Jul 26, 2018 4:57 pm

Rain subsided at noon and I was on lunch break...ya i get to go home for lunch...so I could'nt resist trying out the bike.
Holy sh*t...not the same bike...it hasard become à BEAST...
Up to 3/4 throttle it is scary strong...then falls flat but the Q4 needle with needle set highest did the trick...now all that remains is the main jet...I now have 250s...may put the 230s back in...ordred 200s and 175s...and 20 Pilots.
Getting very close...and that Power put a nasty post-coital grin on my face.
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Posts: 16
Joined: Sun Jun 12, 2016 9:24 am
  Flag
Bike year & model: 1994 xv1100 basket case clean title
94000km
Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: Mikuni TM38 flat Q4s

PostAuthor: Jake » Fri Jul 27, 2018 8:29 am

No posts have disappeared. In the case of your posts, they were split to a new thread ( this one ).

The original poster ( DGA ) has not been active since June 2017, so I locked the thread and split yours and two others to different threads, one of those was not even related to the TM38s.
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Re: Mikuni TM38 flat Q4s

PostAuthor: nanno » Sat Jul 28, 2018 6:46 am

Just goes to show, how much they are restricted by the stock carbs... :cl:
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: Mikuni TM38 flat Q4s

PostAuthor: Jeff0133 » Sun Aug 05, 2018 12:23 pm

So,progress report.
Put 175 mains in,made a huge difference on 3/4 to full throttle.
Actually feels like you get kicked in the pants on full throttle.
Changed the pilot from 22,5 to 20s...hesitates a little 1/2 throttle but am getting very close.
The bike has more power higher up than with the stock mikunis.
Now if I could stop that annoying oil drip from the head gasket...
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Joined: Sun Jun 12, 2016 9:24 am
  Flag
Bike year & model: 1994 xv1100 basket case clean title
94000km
Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: Mikuni TM38 flat Q4s

PostAuthor: nanno » Sun Aug 05, 2018 2:38 pm

sounds like you're getting somewhere! :cl:
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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nanno
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1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: Mikuni TM38 flat Q4s

PostAuthor: Hellgate » Sun Aug 05, 2018 3:37 pm

Ageed! Now that you're in the jetting ballpark you can probably move on to plug chops, then onto how bike responds as you roll off from WOT, then as you go to WOT.
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Re: Mikuni TM38 flat Q4s

PostAuthor: Jeff0133 » Wed Aug 22, 2018 7:10 am

Been riding the bike for a couple of weeks now in all conditions, one-up,two-up,city,twisties,highway.
Strong,fast,no popping,no hesitation or not much (still a little somethin' 1/2 to 3/4 throttle) but all in all running great...better than stock at least.
1 have 175's in waiting for some 160s and 165s cause my plugs read rich and fuel consomption is...Well not optimal, this thing goes thru gas like a little SUV...so leasing it out a little will help.
I won't do much more to the carbs for the rest of the season as i plan on building a whole new engine for this bike next winter.
Finances providing, i plan for xt600 pistons(modified)...new cams(.420) and a C5 ignition, 2-1 exhaust.
So i'll have to redo the carb dance after.
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
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Posts: 16
Joined: Sun Jun 12, 2016 9:24 am
  Flag
Bike year & model: 1994 xv1100 basket case clean title
94000km
Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male

Re: Mikuni TM38 flat Q4s

PostAuthor: nanno » Wed Aug 22, 2018 8:55 am

Also figure in a new exhaust for next season with the built engine as that will have quite the effect as well.

Just to give you an idea: I will start testing the flatslides with 190 mains installed...
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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nanno
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Joined: Thu May 26, 2011 4:06 pm
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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: Mikuni TM38 flat Q4s

PostAuthor: Jeff0133 » Thu Aug 30, 2018 5:51 am

I know i said i would'nt do much, but i dropped down to 160 mains and 17,5 pilots.
Plugs are better although still rear rich, bike runs strong, some hesitation still when i snap the throttle To 3/4...
My needle is in the middle position, i wonder if dropping it down one notch would help
Basket cases make the challenge interesting.
Xv1100, TM-38 flatslides, hayabusa front end, xs 750 tank, reserve tank/fuel pump delete, motogadget m-unit blue, antigravity battery...
More to come

Jeff0133
Junior Membership
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Posts: 16
Joined: Sun Jun 12, 2016 9:24 am
  Flag
Bike year & model: 1994 xv1100 basket case clean title
94000km
Needs love but I like'em that way...
1998 xv 1100 donor(no title)
Sex: Male


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