Summer Shop Talk For You Guys. 3:16

RYAN, WILL DO. LIKE I POSTED TO YA, MY RACE BOX LEANED MY CARBERATION OUT ALOT, I HAD TO DROP CLIP, NOT NEEDLES lol TO CURE IT. DYNO WILL TELL FOR SHURE. 3:16 (yammie tony)
 
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they are a little quicker 2 rev as the 750 crank is lighter.
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Great info, I had wondered about that. Is the swap as simple as just bolting the cylinders and heads on, rejetting carbs and away you go. Although ideal, I can only assume its not that easy. It seems to me that the 750's have a lighter driveline as well, gears and chain are lighter at least(not much, but some). I have heard some people also say that a good welded 750 crank is better than an 800 crank anyways. I am not sure how someone would test that hypothesis accurately but seems an interesting claim.

-Rustman
 
Rustman said:
Great info, I had wondered about that. Is the swap as simple as just bolting the cylinders and heads on, rejetting carbs and away you go. Although ideal, I can only assume its not that easy. It seems to me that the 750's have a lighter driveline as well, gears and chain are lighter at least(not much, but some). I have heard some people also say that a good welded 750 crank is better than an 800 crank anyways. I am not sure how someone would test that hypothesis accurately but seems an interesting claim.

-Rustman
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I WAS TOLD THAT WHEN THE VMAX 4 WAS IN ITS HEYDAY AT THE GRASS DRAGS AROUND 1993-1994 YAMAHA WAS ALREADY USEING THIS SET-UP. 8BU CYLINDERS ON 750 LOWER ENDS. ALSO I THINK JUSTINS MONSTER 560 HP VMAX 4 USED A STOCK LOWER END. 3:16 (yammie tony)
 
YAMMIEGOD3:16 said:
I WAS TOLD THAT WHEN THE VMAX 4 WAS IN ITS HEYDAY AT THE GRASS DRAGS AROUND 1993-1994 YAMAHA WAS ALREADY USEING THIS SET-UP. 8BU CYLINDERS ON 750 LOWER ENDS. ALSO I THINK JUSTINS MONSTER 560 HP VMAX 4 USED A STOCK LOWER END. 3:16 (yammie tony)
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I'm not positive on this but I think Glenn Hall said that crank had been to falicon. Don't quote me on that one. the most impressive 800 I've ever seen is Mike Knapps old V max four that Randy Brewer owns now. they ran 5.30 at the World series this year. Talk about sick and that's at 625 pounds. I've been told by some people that with the weigh off it it's run 5 teens "CRAZY" for an 800cc sled!!!
 
bufalobob said:
all pipes from the same manufacturer are not created exactly equal, there can be differences. that's why dyno tuning is sooo important.
the same set of pipes can peak @ 8500 or 9000, it just depends on how much heat is in them which is in direct relation to jetting, hood venting, timing, coolant temperature & run time. the hotter the center section temperature the more the power peak slides up. my 800 sxr w/ bender triples peaks @ 8800 & looses 9 h.p. @ 9000 but only has a difference of 2.5 h.p. between 8500 & 8900.
bender & full power perf. trail ported 700 sxr w/ bender triple pipes is around 150 h.p.. they built a race version for a ty member that was 170+ h.p..
the closer the gap the longer the stator lasts. i run .018 - .020 on all my sleds.
bob
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Dyno tuning like you said is critical. Whenever you have to close the spark plug gap to make power, you dont have enough spark energy to begin with... I have upgraded all my bikes to MSD. With stock or PVL on methanol I had to run a spark plug gap of .020" with MSD i can run .036" The change was good for 6hp on a 100hp bike
well worth the money
 
kennedy_power said:
Whenever you have to close the spark plug gap to make power, you dont have enough spark energy to begin with... I have upgraded all my bikes to MSD. With stock or PVL on methanol I had to run a spark plug gap of .020" with MSD i can run .036" The change was good for 6hp on a 100hp bike
well worth the money
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Couldnt agree more, increases in cylinder pressure,raising the compression ratio, higher rpm,etc. the old 175watt stator ,fire all 3 plugs at the same time shows itself weak. The newer 300watt stator/3d systems are better but still somewhat lacking in full on performance use. Better technology in spark plug wires and then multiple spark discharge systems with increased spark power are sure ways to up the power of a modded engine for sure! In reality,all your doing by tightning up the gap is putting a band aid on the ign system to get by with,sure,..you can find power doing it. but remember its power thats not being achieved because of a inferior item not performing up to par with the engine state of tune/mods!
 
kennedy/mr viper
i run msd ignitions on all my cars, great products. do they make a multple spark discharge box that works on the srx? if so do you know the part # by chance?
thanks
jeff
 
Staggs, while they do make a system that "will work" on a srx, the system is really only used for full out race, its the msd mc4 motorcycle box and then you need to custom build a pick up plate to work with the 3 cyl snowmobile engine. Its a great system as you can also change your ign.timing curves with a lap top computer to your desired settings. I have run these on full mod 3cyl yamahas and am running one of these systems on my 4cyl rx1 turbo sled with a mapsensor in the loop to help retard the timing per added boost on topend.
 
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