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The TTR250 FAQ web pages -> TTR250 -> Carb stuff -> Is my carb missing bits?
Post Info TOPIC: Is my carb missing bits?
Ether


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Is my carb missing bits?
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I've taken apart my carb to deal with some leakage and it has clearly been taken apart before. One of the float arms had been broken off and pinned back together. There is also no white plastic insert seen in the following pic. What purpose does the white plastic bit have and does it matter if it doesn't have it? 

Carb strip 008.jpg

Also how can I tell what size the jets are? The main jet says V05 on it but that's it. What does that mean?



-- Edited by Ether on Monday 7th of May 2018 12:31:12 AM

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TTRfan


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Hi Tim

Only the later blue models have the white "anti surge" baffle. Most metal-tanked models don't have them.

The main jet has its number/size stamped on the side on one of the hex flats.

The pilot jet has it right on its end.

Lots more photos and fiche pics in the Carb forum.

Brian



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TTRfan


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Hi Tim

Only the later blue models have the white "anti surge" baffle. Most metal-tanked models don't have them.

The main jet has its number/size stamped on the side on one of the hex flats.

The pilot jet has it right on its end.

Lots more photos and fiche pics in the Carb forum.

Brian



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Ether


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Thanks for that. The jets are 145 and 45. According to this page the stock pilot jet should be 50 on a raid, wha difference with a 45? make if those specs are even correct? http://ttr250.activeboard.com/t49772139/raid-specs/

Do the blue TTR's come with a 45 or 50?

Also how can I tell if a jet is worn and needs replacing?



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TTRfan


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Some info here that may help - http://www.ttr250.com/#Carburettor

IMHO it would seem unlikely that a jet would wear and need replacement. You would need some sophisticated kit to measure it even if that were possible.

Brian



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Ether


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That page says most TTR's come with a 50 pilot jet. Would it be worth changing for that instead of the current 45? Would that improve performance by letting more fuel in?

The diaphragm is cracked and leaking so I'll need to replace it. I don't believe the accelerator nozzle was working and to me the bike felt under powered. How much difference would it make to acceleration without that nozzle working?



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TTRfan


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If your TTR was running OK with the 45 then just clean it and leave it in.

The accelerator pump certainly aids performance and is well worth getting to work properly.

Brian



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