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The TTR250 FAQ web pages -> TTR250 -> Carb stuff -> Carb questions
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Braaaap


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Carb questions
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Ok guys, new here So I'm sorry if this has been covered. I got my hands on an 04 blue 250 pretty much free in a trade as boot. It was bored .20 over and when they put it back together it wouldn't run. After I tore into it, ended up being bent exhaust valves. Got all that fixed. Then the carb was very dirty, and of course had the customary broken spot for the float pin. Used quick steel to mild a new one and works great. When I got it all back together, it only wanted to run on choke with a very high idle. I saw a thread on here about that being an issue with the pilot jet. So last night I went to take all the jets out and ended up snapping a brass nut in half. At this point I'm considering a new carb. Anyone have experience with switching carbs?



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JOHNYBOY


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our ttr god brian has been refurbishing a few carbs they look like new he may be along shortly but carbs are like rocking horse poo to find one

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TTRfan


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Braaaap wrote:

So last night I went to take all the jets out and ended up snapping a brass nut in half. 

As John says, it is rare for carbs to come up for sale - at least in the UK - so it's worth trying to fix yours.

Was it the nozzle as shown in the photo below that broke? If so, is there nothing of it showing to get some vice grips on?

Raid_carb 001.jpg

 

If you do go for a replacement then swapping over the carbs is straightforward - see http://www.ttr250.com/Removing_carb/TTR_carb_removal.htm - there are also a couple of videos I made showing removal and replacement. Also, I need carb parts for a couple of rebuilds I am doing so would be happy to buy your old one if the cost and shipping are sensible money wink

Brian



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Braaaap


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She's broken off flush. I'm thinking of trying a mikuni VM model is what I meant by switching. Here's a pic of mine. 



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Braaaap


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Basically, if I can use a different carb, what dimensions and jets would I need? I read that the 250 likes a size bigger on the jets?

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TTRfan


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I did a quick search on Mikuni VM and didn't get any results so maybe no-one on here has done it. In which case I doubt you will get answers on appropriate jetting cry

Petenz started an excellent thread on a 32mm flat slide carb he fitted to his TTR here http://ttr250.activeboard.com/t61885498/32mm-carb/ - defintely worth a look if you are seriously considering swapping out the TTR carb!

If I was in your position, I would drill out the remains of the broken nozzle and fit a new one. No need to worry then about jetting, making up a connector for the airbox and sorting out a different cable setup biggrin

If you are worried about doing the drilling yourself then find a machine shop to do it for you. Should be a simple job as its brass and will drill easily. A lot cheaper and easier than fitting a Mikuni.

Brian

PS Full rebuild of original TTR250 carb detailed here http://ttr250.com/Carb/TTR250_carburettor_strip_and_rebuild_guide.htm



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Braaaap


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My local machine shop wants 50 USD to drill it. Couple that with the fact that a rebuild kit and nozzle will be around an additional 50$, I'm confident I can find a brand new carb for slightly more than that. Mikuni has a TM and VM series of square slides that look nice. Are the stock carbs Teikei Y30P? And if so I'm guessing that's a 30mm?

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TTRfan


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Yep - 30mm Teikei Y30P with accelerator pump - see http://www.ttr250.com/#Carburettor

What about petenz's option I mentioned? He has sorted out the jetting so that's the hard part done wink

Brian



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Braaaap


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I don't see a post from him?

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TTRfan


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Braaaap wrote:

I don't see a post from him?

See my earlier post - I added a link to his thread wink 



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Braaaap


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Ohh ok I see. If I end up getting a new carb I'll probably get a whole jet kit so I can try a few. The 137 I've heard is too lean

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Braaaap


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Or maybe something like this. 



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PlumasDude


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I recommend starting stock OEM and mod from there. Tons of threads on jetting, air box and pipe in the Stickies part of this forum.

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Braaaap


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Plumas, I'm not trying to mod. As of right now, I have a broken carb and just want to hit the trails. Basically, i want it to start and move lol

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JOHNYBOY


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buy a carburettor from brian problem solved

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TTRfan


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JOHNYBOY wrote:

buy a carburettor from Brian problem solved

I appreciate the recommendation John but I don't sell TTR parts any more. Steve is the new and used worldwide TTR parts supplier supremo and has been since June 2016 wink

Brian



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Braaaap


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I think I'm gonna go the route petenz did. Only question now is is it 30mm?

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Braaaap


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Actually I lied. Two questions. He never did mention of he was able to use his stock throttle cable lol

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JOHNYBOY


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sorry brian i thought you did some carbs a while ago pal

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TTRfan


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Braaaap wrote:

Actually I lied. Two questions. He never did mention of he was able to use his stock throttle cable lol

Rather than run a parallel thread it's probably best to ask questions about Pete's particular carb on his thread - keeps it all together wink 



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TTRfan


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JOHNYBOY wrote:

sorry brian i thought you did some carbs a while ago pal

No worries John - any used parts that I need to get some beer tokens for get sold through Steve as happened with those carbs biggrin 



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