Any body know the model number for the rev 4t Mikuni Carb so i can get some spares even lampkins dont know it !!!!!

Edited June 30, 201115 yr by neilnh

Any body know the model number for the rev 4t Mikuni Carb so i can get some spares even lampkins dont know it !!!!!

Mikuni make many OEM variations on that CV carb. Never could find the exact model number myself, when looking. But, I finally did figure out that it is the same as on the Yamaha Raptor 660 (it uses two), so I was able to buy spares, and jets, from the Yamaha dealer.

I recall it is a Mikuni 28mm BSR SE.... and yes as per the above Yamaha use 'em

They are sent out lean in the mid range to pass emissions testing.... so....raise the needle most of the way up and approx 2.5 turns out for the mixture

Edited July 9, 201115 yr by NZRalphy

thanks for your replies chaps will now have a word with my local yamaha dealer to see if he can supply any bits i need

thanks for your replies chaps will now have a word with my local yamaha dealer to see if he can supply any bits i need

Without sounding daft where is the ar mix screw located on the carb? it doesnt seem that apparent

Underneath, at the exit end of the carb (engine side).

It is a right SOB to get at.

Make a mini flat head screw driver to do the specific job. Or, as I have, buy the Jitsie air screw. Don't over torque the screw down.

Note if you are removing the jet there is a mico-mini-small oring in there!

Edited July 21, 201115 yr by NZRalphy

thanks for your replies chaps will now have a word with my local yamaha dealer to see if he can supply any bits i need

You want to start here:

Pilot jet: 22.5

Main jet: 130 to 135

Air screw: 2 3/8 turns out

Needle clip: 2nd slot down from the top (thick washer below clip and thin washer above)

"I recall it is a Mikuni 28mm BSR SE..."

Is that the same carb as the one used on the EVO 4T?

Edited October 3, 201312 yr by levis

By the way nzralphy, I saw you have replaced the pilot screw by an more handy Jitsie air srew. Do you have a link to buy It?

Does this one fit:

http://www.ebay.com/itm/MIKUNI-pilot-fuel-screw-604-26003-007-138-RS-smoothbore-TM36-TM40-/231041312076?pt=Motorcycles_Parts_Accessories&hash=item35cb22a54c&vxp=mtr

Thanks

Edited October 26, 201312 yr by levis

http://www.trialscentral.com/forums/topic/25302-beta-4t-jitsie-carb-screw/

http://www.trialendurodirect.com/products/Jitsie_Beta_REV4T_carburettor_air_screw_569.html

http://www.trialendurodirect.com/index.php?manufacturers=39&sort=&filter=12

Thanks nzralphy,

By the time you answered I had already bought this one:

http://www.gprquad.c...5_1416-849.html

It fits well though a bit too long. I had to shorten it and now my carb is under control. yes! great stuff.

By the way this one doesn't fit (too big):
http://www.ebay.com/...b22a54c&vxp=mtr

Edited May 10, 201412 yr by levis