triple PRO RMK

mattymac

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its going, definitely learned a bunch on that project!

It makes WAY more power than my 1200 which runs well Ive never dynoed my 1200 but typically they make 235 hp in stock form how mines put together, that 1500 i figured should make 275 and I have no doubt its making at least that!! Ideally I wanted to see how this pro project turned out then I was either going to put the 1500 in an iqr or a pro because the chassis its in isnt anything special. For the pipes alone I might try to find a nice iqr mtn chassis but after finally getting my pro running its a fun chassis for sure! If I cant find the right iqr to put it in ill probably put it in a pro this summer. Along with swapping my turbo apex into a ti chassis sitting in my shop and currently doing another 1200 wc pro along with a buddies 1000 cat big bore pro! Gonna be another long summer but after this im done building for a while!
 

KMMAC

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its going, definitely learned a bunch on that project!

It makes WAY more power than my 1200 which runs well Ive never dynoed my 1200 but typically they make 235 hp in stock form how mines put together, that 1500 i figured should make 275 and I have no doubt its making at least that!! Ideally I wanted to see how this pro project turned out then I was either going to put the 1500 in an iqr or a pro because the chassis its in isnt anything special. For the pipes alone I might try to find a nice iqr mtn chassis but after finally getting my pro running its a fun chassis for sure! If I cant find the right iqr to put it in ill probably put it in a pro this summer. Along with swapping my turbo apex into a ti chassis sitting in my shop and currently doing another 1200 wc pro along with a buddies 1000 cat big bore pro! Gonna be another long summer but after this im done building for a while!

Ya,,, that sounds like a busy summer. I knew that cat would have good hit, can't wait to see it on the snow.
What carbs are on the cat, bored 40's? Would lectrons be better or are they just too hard to tune?
 

Clarke_67

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I have a cat 800 triple in a 95 ish chassis.... it runs. I never take it out or let people ride it cause looking at that heavy ass block hurts my back lol. My turbo mod is finishing up more or less this week came to check back in and give you wet weights. keep in mind, its built to bomb through rmsha style courses and not be crooked as a democrat when it comes out the top, defiantly not the lightest build lol runing 153 ez ryde with 3" cat pc, fox evol x ski shocks asault width alternative impact chromoly a arms ( heavier wall custom built) zrp axys spindles, and 2019 axys assault (more or less) geometry.... ice age billet chain case, boondocker race gas intercooled air to air kit with a lot of mods and revisions to move air. P.s. looking for a good set of mikuni tm 36-38 trippple rack for an xlt build
 

Jay

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Amazing, the thought and engineering you have put into this leaves me in awe. I've always wanted to build a 1350 UBR pro but the reality is probably never going to happen. There was a shop that built one about 3 years? ago, they had the build on here but I can't remember the name. Toy's something? Love to watch your work, keep the stories/pics coming.
 

mattymac

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Amazing, the thought and engineering you have put into this leaves me in awe. I've always wanted to build a 1350 UBR pro but the reality is probably never going to happen. There was a shop that built one about 3 years? ago, they had the build on here but I can't remember the name. Toy's something? Love to watch your work, keep the stories/pics coming.
Thanks Jay, The sled youre thinking of was built by Jake from mild to wild motorsports, it was actually a 1375 UBR with more of a one off stroked crankshaft. It was parted out and my buddy owns the chassis and it has a billet 910 twin in it... very nice sled even with 2/3 of an engine in it!

If youre referring to the cat engine, the Reality is this was thought up decades ago with cutting/welding cases to make bigger displacement engines. All Im doing is putting the already built pieces of the puzzle together.

The big cat triple surprisingly fits in a pro chassis better than the WC based engine and makes more power with OEM cheap and readily available parts for years to come. I have an engine plate im saving to build one of those in the future. Making progress on pipes and over this last summer I did another pro rmk 1200 for a buddy that we got the pipes to fit under the stock side panels and diamond S mesh hood! Looks totally stock!!! sled weighed 516 with a huge double pass cooler (full), 163, and with 5 gallons of fuel... well under 500 dry and 240+ hp.

And I also fit a PRO RMK with a 1000 cat twin big bore twin, with twin pipes for a buddy to get an idea on doing the cat engine. Stock hood/panels/headlight. This sled weighed in at 446, 155, twin pipes, and about two gallons of fuel. should be 180+hp.
 

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mattymac

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I reworked the crank in the 1500 cat. Northern crank added just under 2 lbs to the crank by putting tungsten slugs into it to help smooth it out and tame the harmonic that these engines were known to have when built into a triple. Its much smoother now than it ever has been and should live a long happy life! Gathering parts up for another engine build to someday stuff into a pro and hopefully get it all tucked into a mesh hood and stock side panels.

If you look at the pic of the crank you can see where they welded the tungsten in the wheels of the crank. 6 slugs per cylinder.
 

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mattymac

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If the second cat engine doesnt pan out I also put together a brand new 1200 WC this summer for a spare on the shelf!
 

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Clarke_67

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i have been working on one of these as well. It shall be called XLT-2
 

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