yamaha_snopro
New member
i want to do a bigger bore for my 600 twin anybody have any ideas on how big a bore that motor can support before becoming unstable? i want to go out to about 800 or 900, does anyone know if yamaha snocross ever made an 800 open mod engines?
nailsandrails
VIP Member
Welcome to Totallyamaha!!! I'm not up on the latest for BB kits for the 600. I had a 94 vmax with a 680 kit from hauck. The best I got it to run was 101 in 1000ft. It was extremely fast at that time.. Sounds like you are looking for more. I'm sure anything can be done for a $ amount. 
Don't do it
I had a Hauck 700 BB on that motor. It was not all that powerful and it blew up in about 400 miles. I had not even gotten it dialed in from a jetting perspective. It was still rich. If you ask me, that motor was not stable to begin with and making it bigger is a waste of $$ and asking for trouble. I'm not trying to put down you sled, just giving you my 2 cents based on my $2000+ loss.
Madmatt
I had a Hauck 700 BB on that motor. It was not all that powerful and it blew up in about 400 miles. I had not even gotten it dialed in from a jetting perspective. It was still rich. If you ask me, that motor was not stable to begin with and making it bigger is a waste of $$ and asking for trouble. I'm not trying to put down you sled, just giving you my 2 cents based on my $2000+ loss.
Madmatt
yamyrider
Active member
I have to agree.
The 600 twin was not the best of Yamaha's motors.
The ones I have seen stock all tend to blow after 1200 miles.
But thats only 3 I have seen.
The 600 twin was not the best of Yamaha's motors.
The ones I have seen stock all tend to blow after 1200 miles.
But thats only 3 I have seen.
nailsandrails
VIP Member
Well I did have good luck with mine. BUT.. The guy that had it after me blew it up.. It was his fault though. He fired it up and ran it across the lake without warming it up..
yamyrider
Active member
well I will say that the ones I seen blow were lake runing as well.
The machines were harmed up but seems the pressure of runing the lake for about an hour or so was too much.
Tried keeping up with the tripples and did not survive.
Either way it is a yamy and we all love em but the 600 twin was not the best of Yamaha's work.
The machines were harmed up but seems the pressure of runing the lake for about an hour or so was too much.
Tried keeping up with the tripples and did not survive.
Either way it is a yamy and we all love em but the 600 twin was not the best of Yamaha's work.
03viperguy
Moderator
I liked mine, but it was problematic. if you really want more, get a 700 tripple from someone and punch that out, think you will be happier
Phazercory499
New member
so putting big bore kits on those engines is a bad idea?
03viperguy
Moderator
yeaaaaaaaaaahhh, sounding it 
like I said, hit up a 7 tripple. when I had my 600, I put a clutch kit, v-force and thin head gasket on it. woke it right up nice, but the v-force were problematic and I ended up hating them. they have since redone them, so maybe the kinks are all worked out. just some suggestions
like I said, hit up a 7 tripple. when I had my 600, I put a clutch kit, v-force and thin head gasket on it. woke it right up nice, but the v-force were problematic and I ended up hating them. they have since redone them, so maybe the kinks are all worked out. just some suggestions
VmaxSx600
New member
not worth the money to bore it try getting some pipes and reeds thin headgasket and a clutch youll be happy and throw in a track!
tripple_tripple01
New member
i have a 95v-max 600 with porting, and a set of gyt pipes. also has clutch kit. sled pulls pretty hard, and very reliable. just very very bad gas milage!!!!!!!!!!!!!!!!!!!!!!!!!!!!