spluttering tri z.help.

[bada450r]

i got an 86 tri z,that is spluttering on top end.my mods are ported cylinder,and a wrench report window,milled head 25 th,dg pipe,i got 155lbs of compression,38 makuni round slide carb,[jetting is at 490 main needle on first clip to the top]iam also wonderinr where the time should be set at?i got it in the center line right now,is that correct?please help.thanks.iam at sea level[also staightb filter to the carb]:beer thanks

[Black86tri-z]

your compression is a tad low should b 20 pounds more but should still run no prob, pull apart your fuel pump,its a common problem on the z's not getting enuff fuel

[bada450r]

i have a top mounted tri zinger tank.what about the timing?where should it be set at?also why is my compression low?i only shaved 25thousands of the head,should i really be at 175 lb?the other thing was that i did a compression test,right after maybe staeting it 2 or 3 times,iam thinking that once i have it fully broken in it should go up?thats my theory.let me know what you guys think.thanks

[bada450r]

also its spluttering,not back firing.if that helps.thanks

[Bryan Raffa]

sputtering at WOT? if so start going down one jet at a time untill it clears... Whats the plug look like?....

[bada450r]

yes at at wot,but the thing is i got a 490 main,and correct me if iam wrong,but doesnt thr tri z have a 470 stock,i know that i got a 38 round slide makuni,but should i go down on the jetting even more?what about the stator plate is it ok in the center line?thanks,and ill try a 480,and i hope i dont go down to a 470,but i guess if i have to.thanks