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#145574 - 06/19/19 02:53 PM Mikuni TM28-1 carb
gumpfx Offline
Junior Member

Registered: 06/13/19
Posts: 3
Loc: Hampshire,UK
Hi there,

Wondering if someone can help! I've got a 1993 XT225 with running issues. It's had a lot of work carried out but in the end the bike would often flood when returning to idle. The bike's compression, ignition timing and valve clearances are all checked and good the bike is 99% standard with a slightly louder muffler (which would normally make it all run lean....).

I've now gone for a Mikuni TM28-1 carb which I've heard can resolve the issue.

Is anyone here running this carb successfully? If so, do you know what size jets they are running?

Any help would be much appreciated!

Many thanks

Harry

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#145609 - 06/24/19 02:43 PM Re: Mikuni TM28-1 carb [Re: gumpfx]
Muniac Offline


Platinum Member
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Registered: 01/16/04
Posts: 5738
Loc: Montrose, CO
Harry - Over the past 15 years on this board, I've not been able to get anyone nailed down on jetting either the TM33 or TM28 carbs. Seems somewhat of a black art and no one is especially transparent about their R&D. That's not to say it can't or hasn't been done. As for jets and parts SUDCO has all this stuff. Perhaps someone there can guide you regarding the TM28, XT225 and jetting.

I do know from working with the TM33-8012, its stock throttle cable bracket will hit the frame rail on the bike. So there were some physical mods required before any jetting issues were addressed. Good luck!
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#145619 - 06/27/19 06:15 AM Re: Mikuni TM28-1 carb [Re: Muniac]
gumpfx Offline
Junior Member

Registered: 06/13/19
Posts: 3
Loc: Hampshire,UK
Many thanks Muniac. I shall give them a try and post back again when it's running - fingers crossed!

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#145620 - 06/27/19 03:38 PM Re: Mikuni TM28-1 carb [Re: gumpfx]
Muniac Offline


Platinum Member
*****

Registered: 01/16/04
Posts: 5738
Loc: Montrose, CO
U R Welcome. I've been trying to nail these details down for years without any luck. I think an alternate carburetor setup would be of value to many. Tuning, jetting and dialing in a carb is a black art. SUDCO also sells a carb tuning manual which has a lot of educational material in it. Explains a lot of subtle details you wouldn't know about normally. Many being relevant to what you are embarking on.

This site isn't the last word or the complete dictionary on carbs and who's doing what. It's possible someone out there has solved this problem. The XT225 has been an under served bike for many years although this site has helped advance the cause a little. Good luck!
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#145670 - 07/13/19 07:43 PM Re: Mikuni TM28-1 carb [Re: gumpfx]
Detour Offline
Junior Member

Registered: 09/30/18
Posts: 18
Loc: WI
I purchased a TM28 last season and still have not found the time to start the XT225 rebuild project. I am not a master in these black arts, but I will be sure to post up my findings when I get around to the project. Expect it to be weeks or months, not days.
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#145683 - 07/14/19 03:46 PM Re: Mikuni TM28-1 carb [Re: gumpfx]
Muniac Offline


Platinum Member
*****

Registered: 01/16/04
Posts: 5738
Loc: Montrose, CO
I understand about available time and priorities. Finding myself in the same situation lately. That being tinkering projects are on the back burner. When you can post it, any information about alternate carbs for the XT would be helpful.
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Be There or Be Nowhere! A Few Adventures & Video

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