A forum for owners of Yamaha TTR250 trail and enduro bikes!

Terrence R · Senior Member

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TTRfan · Super Guru

LOL - don't panic Terence!

It's a baffle that stops the petrol sloshing around the main and pilot jets.

Your TTR will most likely work perfectly well without it unless you are a Championship class enduro rider wink

Just remember to fit it next time you have the carb off for another reason biggrin biggrin

If you do find a problem running without it then I would be very interested to know the symptoms.

Go ride it and see smile

Brian

Terrence R · Senior Member

Lol, thanx Brian. I was really starting to sweat there. I'll report back if I notice any odd symptoms.

TTRfan · Super Guru

I have done it myself. It is so easy to put a carb back together only to find a "spare" part on the bench when tidying up - no matter how careful or how good your systems are disbelief

If it is of any reassurance, the early carbs didn't have the baffle fitted wink

Brian

hanzo · Senior Member

ditto!!! thats how i lost my brain surgery job biggrin biggrin

Terrence R · Senior Member

Hey Brian, is there such a thing as a 51 pilot jet for these bikes? Or would 52 be the next incroments up? My jet kit came with a 52.5, which is too rich. And the stock 50 I have is too lean (USA bike).

TTRfan · Super Guru

To the best of my knowledge the standard pilot jets are in increments of 2 so jump from #50 to #52 with no #51.

I wouldn't have thought that the engine would be that sensitive to such a small change confuse

Presumably your #52.5 is non-standard?

Brian

TT-R250M · Super Guru

TTRfan wrote:

If it is of any reassurance, the early carbs didn't have the baffle fitted
Brian

AFAIK- All TTR's have the baffle, see HERE. I know my old OE 1994 model had one installed. Edit: I tink you mean the older bikes.

Not that it is absolutely necessary though unless you are throwing the bike around a lot.

Jarrah

-- Edited by TT-R250M on Wednesday 28th of May 2014 04:54:45 AM

TT-R250M · Super Guru

TTRfan wrote:
To the best of my knowledge the standard pilot jets are in increments of 2 so jump from #50 to #52 with no #51.
Presumably your #52.5 is non-standard?
Brian

Correct!

Terrence has the 6 Sigma jet kit... A #140 main with the needle set to the richest setting (apparently) so yes, non-standard.

I would suggest a #52 genuine Teikei, Brian should be able to help at a small cost. Failing that, you will need to buy jet drill bits and make the #50 into a #51 (which should be a .051mm drill bit).

Jarrah