Solutions for MtnHorse lust for more power...
- Thread starter FurryCURT
- Start date
KAWGRN...
Allen at timbersled has the KTM enduro 690 with all the perf upgrades on it... he still prefers his 450 MX bikes to the big bikes.
Allen at timbersled has the KTM enduro 690 with all the perf upgrades on it... he still prefers his 450 MX bikes to the big bikes.
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I was lucky enough to ride Allen's 690 all day, damn it was a beast, but i think i have more fun on a 450. I guess it just depends on what you want to do, if you want to try to hillclimb with the sleds(totally missing the point of snowbikes imo) than you may want something bigger.
I never had the 690 run out of power thats for sure, but at the same time its heavier and not as agile as the race bikes. I bought a 450 to put my kit on, its the fun factor i suppose, and the 450's will easily hang with the 690, just me 2 cents.
Unfortunately, in Colorado we lose alot of HP to altitude.
We unload at 10,000 ASL. Typically ride 10K-12K ASL all day.
With a track, my CR500 feels sick at that altitude (compared to what I'm used to anyway).
I agree that a 690 or similar is too big for the kind of riding we do.
Hence my effort for a turbo'd 450, big bore CR500, or SXV 550 or all the above... Damn, I want light, nimble, agile, and big power.
Still no clear answer.
We unload at 10,000 ASL. Typically ride 10K-12K ASL all day.
With a track, my CR500 feels sick at that altitude (compared to what I'm used to anyway).
I agree that a 690 or similar is too big for the kind of riding we do.
Hence my effort for a turbo'd 450, big bore CR500, or SXV 550 or all the above... Damn, I want light, nimble, agile, and big power.
Still no clear answer.
Were you running a CR500AF on a MTN. HORSE kit?
I have a 500AFX, but only ride it in the dirt.
I was running a 1997 CR500 + NO2 (15HP) on a Mountain Horse. Worked well once I got carb-ice issues worked out. I'm hooked on snowbikes. I had an absolute blast and way more fun than any sled riding. But want more juice... So, Project # 1, I pulled the 500 engine out of the MH this summer and am building a 625CC to put back in. Project #2 is the Turbo CRF450R at KMS Performance.
I was running a 1997 CR500 + NO2 (15HP) on a Mountain Horse. Worked well once I got carb-ice issues worked out. I'm hooked on snowbikes. I had an absolute blast and way more fun than any sled riding. But want more juice... So, Project # 1, I pulled the 500 engine out of the MH this summer and am building a 625CC to put back in. Project #2 is the Turbo CRF450R at KMS Performance.
How does the 500 doo???
I've got a practically brand new 2001 CR500 (last year made) with all kinds of goodies...I'd love to either sell it or Mountainhorse it if I find work.
I've got a practically brand new 2001 CR500 (last year made) with all kinds of goodies...I'd love to either sell it or Mountainhorse it if I find work.
My CR500 did great. Low (no) maintenance. Just put mix in and go. I did have to work out carb-ice issues which was a pain in the beginning. I think the 2-strokes may be more subseptical to carb-ice. You probably ride at lower altitudes, which should make it work even better.
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Pipe chill and loss of waveform through the pipe could be a huge issue on the 2 stroke..
What did you do to shield the pipe to keep the heat in on the CR500??
What did you do to shield the pipe to keep the heat in on the CR500??
Do you mind sharing what you did to fix this? Got any pics of this bad boy?
The coolest I've ridden my bike in is only around 20'F but wasn't in snow, didn't have any problems. It likes colder temps. My dirt riding is 2,000-6,5000 ft as is my sled riding. My jetting is quite a bit different than the factory though.
I'm running the Gnarly Pipe on my which is ceramic coated. Hmm
Dave,
Ceramic will not keep the pipe from chilling when submerged in snow though.
I've seen twin pipe sleds that "fell on their face" when the hood was broken and the pipes got coverd in pow.
I'd love to see a 500AF on a Mountainhorse.
Ceramic will not keep the pipe from chilling when submerged in snow though.
I've seen twin pipe sleds that "fell on their face" when the hood was broken and the pipes got coverd in pow.
I'd love to see a 500AF on a Mountainhorse.
A couple pics of my CR500 MH attached. I ride in deep snow. My only issue was carb ice. It would happen at any temp, however 25-35 degrees was worse. Riding in the powder my entire carb/cylinder would be an ice cube (see pic 1), along with the airbox full of snow. My solution was to seal the airbox, install snow vents, then fill airbox with foam to displace any snow, install a carb heat probe (KTM part), and put foam all around the carb so snow couldn't build up on it (see in pic 1). Mountain Horse makes a good point about the pipe heat, however I never noticed the difference with the pipe caked in snow, or running a hard pack road where the pipe may/would heat up. I run a stock pipe that is nickel plated. I also have a A/F gage and an intellijet mixture adjustment so I can adjust mixture on the fly while watching the A/F ratio. In pic 1 if you look closely under the rear fender you can see the NO2 bottle (in black insulation bag) and nitrous line going to carb. Ski-wise, I now run a Simmons 8" wide ski purchased from 2-Moto. It comes with outside edges and works great in the powder and tolerable (barely) on the hard pack.
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So how does the 500 do compared to the 450's. Does the 500 have the same carb as the 300, just wondering how easy the install was on that heat prob. I will either be running my MH kit on my 300 or buying a 500. Any more insite you can provide on the 500 would be great, both myself and a buddy are thinking real hard about buying 500's instead of running our 300's but we don't know much about the 500.
http://www.snowestonline.com/forum/showthread.php?t=273970
I think this guy is one step ahead of you...thing looks SSSOOO SICK!
I think this guy is one step ahead of you...thing looks SSSOOO SICK!
CR500 has a Keihn carb. I think that's the same on the KTM 300. Heat probe is easy to install. Just drill and tap carb. When you get the kit and pull your carb you'll see there is only one obvious place to drill it for the probe.
I haven't rode a 450 so I can't compare. One thing, the more power the better...
I haven't rode a 450 so I can't compare. One thing, the more power the better...
Yeah I saw the KX 750 of turbo99. Bad to the bone for sure! Might be a little heavy in the tight trees. I think the 750 is about 100-125 hp, which would be about 70 - 80 hp at 10,000 ASL (3% loss per 1000 feet) in my riding area. I should make the same or more with the turbo 450 and be quite a bit lighter.
I can't wait to see that 750 on you tube climbing some big chute!
T
turbo99
Member
the 450 is going to be sweet! i just got done with the kx540 ported that thing should go well.
im looking for a scale to wiegh the 750 i think its going to be around 350lbs.
on paper the 750 149hpat elivation around 130hp
i have a berg650 timbersled kit for the tight trees
how much boost are you going to run?and what is your goal on HP?