[northstarrick]

Do the Indy 550s need the oil pump mod like the older ones? Anyone know? The newer ones have the CV tech primary clutch also correct? How's the tune ability of the CV tech clutch?

all the newer 550's have the oil bleed kit installed from the factory. all IQ'S and INDY'S i think it started the last year of the edge chassis 550's if i'am not mistaken? the cv tech clutch works amazingly well on this motor and will never need rebuilding. there are the clutch of choice on four stroke large c.c. four strokes. first thing you did on a yamaha was throw the stock clutch in the metal scrap pile. pos was a under statement. there are only two components to mess with on the 550. the pucks and springs that's it. the one we put carbs on has a p-85 so if i were to mod a new indy i think the first change would be to put Polaris clutches back on one. so you have more tunablity.

 

[northstarrick]

So for a 550 stock in your garage, start with a ufo? Any guides out there for jetting for someone who isnt a real pro tuner? Sounds like a fun project.

yes cut the pilot jet in half and maybe one size lower then that. and up the mains by one then look at plug color/piston wash to make sure it's safe.

do all zones with old plugs quicker to see any change. 1/4 throttle for a long run. hit the kill switch then release the throttle. and check plugs. should have some color on the porcelain and not be bright white. same at half throttle, 3/4 throttle, and wot. but in the 2 later check piston crowns for wash at the transfer ports. should see 1/4-3/8" of near bare piston in a v right near the two ports on each side of the piston. if more your to rich if less or none your too lean.

 

[RZL07375]

For what its worth bout a year or so ago I did read where a guy said he put a GGB can on his Indy 550 and said it gained a nice increase in tnrottle response...

 

[too slow]

For what its worth bout a year or so ago I did read where a guy said he put a GGB can on his Indy 550 and said it gained a nice increase in tnrottle response...

Was the guy about 12 years old?

 

[RZL07375]

For what its worth bout a year or so ago I did read where a guy said he put a GGB can on his Indy 550 and said it gained a nice increase in tnrottle response...

Was the guy about 12 years old?

Lol....no but I was kinda thinking the same thing.

 

[RZL07375]

Im not afraid to admit I know zero about snowmobile performance mods. Now atvs I have done lot of mods but with sleds Im clueless. Can you add like V Force reeds or other aftermarket type reeds to these for a boost?

 

[northstarrick]

Im not afraid to admit I know zero about snowmobile performance mods. Now atvs I have done lot of mods but with sleds Im clueless. Can you add like V Force reeds or other aftermarket type reeds to these for a boost?

nope. there a cylinder reed motor. it's still a piston port motor with a small reed assist petal at the bottom of the cylinder intake side. it allows earlier intake into the crank case before the piston skirt clears the intake port. which is weird. why they choked it off with 34 mm carbs but have big crank case volume? i'am thinking it was a fuel pig with 38's on it. they were probably going for better fuel mileage with the 34 carb's? no one makes any aftermarket reeds for this. and probably wouldn't see a gain here.

 

[RidinMi]

I would leave the motor, pipe etc alone. You'll probably be asking for trouble on the trail with those motors. Rick knows these sleds and see if he can do the work and help with the parts you need ? I would bore the carbs, UFOs and tune the clutch, jet to ride in all temps so you can leave the hood down and just ride. May be rich in the warm weather, but rip in the colder weather like stock jetting. I have a 440 fan and a Gen 2 550 we ride every year sitting in the stable, but the reality is if you really want much more power, then go to a 600 liquid. That 550 can be woken up for sure and it will be a fun sled if you do.

 

[too slow]

nope. there a cylinder reed motor. it's still a piston port motor with a small reed assist petal at the bottom of the cylinder intake side. it allows earlier intake into the crank case before the piston skirt clears the intake port. which is weird. why they choked it off with 34 mm carbs but have big crank case volume? i'am thinking it was a fuel pig with 38's on it. they were probably going for better fuel mileage with the 34 carb's? no one makes any aftermarket reeds for this. and probably wouldn't see a gain here.

I would guess better throttle response with 34's to. I think any top end gains using 38's would be marginal. Really have to get into the motor for substantial gains which isn't good if you demand gas and go reliability.

 

[RidinMi]

I would guess better throttle response with 34's to. I think any top end gains using 38's would be marginal. Really have to get into the motor for substantial gains which isn't good if you demand gas and go reliability.

We used to do the oval bore and UFOs to keep the low end and cruising drive ability on our trail sleds. Milled the head many times too with the carb work for snappier throttle - just had to run premium. Many years wrenching instead of riding, so we got more and more into dependability with the short snow season. Changing a piston in a parking lot in Munising suck'd and lost a day of riding. Plus it was ass cold, running around for parts etc... Been awhile since I messed with any of that since flatslides, fuel injection and roller clutches became a plentiful option. Clutching and tuning the stock sleds is more our approach anymore. Want more power, buy a bigger sled. My tuned 600 runs probably faster than my brand new Mach 1 700 triple/triple I had. And easier to ride, those old muscle sleds were tanks.

 

[too slow]

I can tell you the old gen2 ves 600 i had was faster than those 00 700 mach 1 triples. Raced a slew of them that were clutched and studded. Only could really one that was close.

 

[RidinMi]

I can tell you the old gen2 ves 600 i had was faster than those 00 700 mach 1 triples. Raced a slew of them that were clutched and studded. Only could really one that was close.

I snow-checked a 2000 600 xc sp. Loved that sled. I studded it, put a RB Industries clutch kit in and back then we sent our secondaries to Goodwin to have them machined into a roller secondary. Sled was a rocket. My buddy on his 98' CK3 700 Mach 1 and my other buddy on his 98' 670 MXZ w/ dynoport pipes knew what my taillight looked like. Except that Mach has long legs on the lake runs. I got a huge kick out of that. We couldn't believe how fast that sled was with studs and clutch work. That's about when we stopped donating our money to the Crank Shop and Dyno Port etc and tuned the stock sleds. dependable and fast.

 

[too slow]

You didn't need these aftermarket clutch kits imo. I ran ground down sides on 64 weight to 63 an almond/ gold spring with slp slippery brute buttons, epi purple secondary spring and a hsp 34x helix. 23/40 stock gears. I ran a 2 degree timing key with hsp reprogramming the cdi unit. 120 chisel studs using all 3 belts along with air box mods. This worked well for 1000' runs. Used different gear/clutching for 660'
A buddy of ours had his carbs oval bored along with the stuff i did on his 00 600 ves..that sled was about 2 sled lengths faster than mine. Both of were able to beat 800 sleds, his more often.





a purple epi

 

[Frankie406]

Lol....no but I was kinda thinking the same thing.

I will say, a friend of mine with his SKS 850 last year, put a SLP trail can on it, he said without a doubt it cleaned up the bottom and made it more responsive. It's not loud at all, sounds much better, and removed a bunch of weight. Also, it allows access to the chain case without removing the suitcase.

I am not a big "can" guy, but some of them aren't obnoxious, and you wouldn't know you had one. I believe Speedwerx, says their trail cans are actually quieter than stock, with a better tone.

 

[racerdave]

I will say, a friend of mine with his SKS 850 last year, put a SLP trail can on it, he said without a doubt it cleaned up the bottom and made it more responsive. It's not loud at all, sounds much better, and removed a bunch of weight. Also, it allows access to the chain case without removing the suitcase.

I am not a big "can" guy, but some of them aren't obnoxious, and you wouldn't know you had one. I believe Speedwerx, says their trail cans are actually quieter than stock, with a better tone.

Spending money can make a person believe a lot of things.

 

[too slow]

Spending money can make a person want to believe a lot of things.

Fixed it.

 

[Frankie406]

Spending money can make a person believe a lot of things.

He has had at least 30 new sleds since the mid 90's, and is an actual engine builder that mods snowmobiles for part of his living. If anyone knows the difference, he would. Currently, has a 2016 Pro S switchback 800, a 2017 Rmk Pro with Silber Turbo, a 2019 SKS 850, sold his 2017 Assault 800 end of last season, and has a 137 XC 850 Indy coming to add to his fleet. He isn't your typical rider. If anyone can tell you if it helped or not, he can. I should add, all his sleds have some sort of mods.

 

[1fastpolaris]

Darn I thought there was a new post on 550 performance.

 

[racerdave]

He has had at least 30 new sleds since the mid 90's, and is an actual engine builder that mods snowmobiles for part of his living. If anyone knows the difference, he would. Currently, has a 2016 Pro S switchback 800, a 2017 Rmk Pro with Silber Turbo, a 2019 SKS 850, sold his 2017 Assault 800 end of last season, and has a 137 XC 850 Indy coming to add to his fleet. He isn't your typical rider. If anyone can tell you if it helped or not, he can. I should add, all his sleds have some sort of mods.

Ok.

 

[Frankie406]

Ok.

Exactly. If it worked it worked. Whatever man. You know it all.