any thoughts??

[dreaming-of-a-v-max-4]

i did the head gasket mod i am down to one layer i am running 47.5 secondarys the book calls for 50,s right now i have the air screw turned out to 1.5 turns now when i pin the throttle on take off it falls on its face but if i ease into it it is fine i checked my plugs they were almost grey so i am woundering if i should turn my air screws back out to 2 turns i dont like to see my plugs that lite it is a 93 750 any suggestions guys thanks tim

[fastmax]

I might be way off base here but its something to check. Have you checked your belt deflection? I chased my tail for a week one time because I had put on a new yamaha belt that turned out to be slightly longer than normal :cussing: (I now measure all my belts). Gave it a bad bog off the line.

[AL P]

1 1/4 belt deflection? is that correct? I had ask about bekt deflection awhile back, and did`nt hear any comments on how much, but i had read some stuff at totally yamaha I think it was, about 1 1/4 bieng the standard on most or all modern machings. thanks.

P.S, when I checked my belt deflection, it was much closer to 1 3/4 or more, so i rechecked my center to center, and off set, and both were dead on.

[dreaming-of-a-v-max-4]

i will check that out tommorow thanks tim

[IZZ]

Hey Tim, Im having the same problem with my 93 right now, stock gasket though, but 800 pipes.
I have my airscrew at 1.5 also and Im running 45 pilots. Falls right to sleep if I pin it from a stand still, but if I ease into it, its just fine.
Racer sugested flipping the choke on when I pinned it to see if it was a lean low circuit problem. Well I did and the problems gone!
So now Im at the same point, do I bump up the pilots or turn the airscrews out?

Anyway the choke tricks a good way to tell if its doing it because its to lean.