tri-z jetting

[jmax857]

okay so im just ordering parts for my trike and i want to know what sizes jets to buy, i know that it all depends on your setup, elevation, temperature, blah blah. just wondering a Ballpark so i can order a few bigger and a few smaller so i can fine tune.
i have a dg pipe and silencer, bored to 70mm, stock reeds, and a clamp on uni filter. its an 86 carb aswell.

[Bryan Raffa]

up grade the carb to a pwk.....

[Just-Tri-It]

They're not that expensive. 470 is standard. Maybe get the 480, 490, 500 if you're not sure. I don't think going down will be the direction you'll go but you'll have to chop it to know for sure. It would probably not be a good idea to start less than the standard 470 with those mods. Start rich with the clip in the middle slot as a rule of thumb.

[jmax857]

up grade the carb to a pwk.....

i knew someone was gonna say that.

i knew it was going to go up in sizes, i just didnt know how far. ill probably order the 480-500, also do you think i might have to go up a size in the pilot?

[zzmegad]

First, open the carb and see what you got. The 470 is standard for the 85, but I think the 86 is quite a bit lower, i think 320. Also, Raffa, I have been looking for a pwk, I found this new one on ebay. I just dont have enough experiance to know if anything other than jets would need to be changed such as the slide or needle or needle jet. Can you give any advise on starting points with the pwk on the triz? Thanks

http://cgi.ebay.com/ebaymotors/YAMAHA-TRI-Z-250-YTZ250-38mm-38-KEIHIN-CARBURETOR-85-86-_W0QQcmdZViewItemQQhashZitem1e6154f412QQitemZ13048 1976338QQptZMotorsQ5fATVQ5fPartsQ5fAccessories