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Post by oldscorpman on Mar 18, 2017 14:34:22 GMT -5
did some horse trading today with a fellow scorpion nut. he needed a boogie and rear idler set up to convert a 70 mark II track and i traded one of my extra set-ups for a 290 ccw engine and clutch and a brand new ,still in a sealed plastic bag and mikuni box vm34mm carb. it has a 330 main jet,30 pilot jet,0.5 air jet,159q-0 needle jet,6dh2 jet needle,and 2.5 throttle slide. my question is will this work on a 440 cuyuna engine or what changes will i need to do. this is for a trail rider not a racer.
thanks rick
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Post by 80whip440 on Mar 18, 2017 14:59:36 GMT -5
Should be close. My 34 runs a 6DH3 needle and a P4 needle jet. 2.5 slide, with either a 30 or 35 pilot.
Runs good with a Uni pod on it.
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Post by 75whip on Mar 18, 2017 15:19:20 GMT -5
Rick my 400 range whip i rebuilt this winter is 159Q0 needle jet, 6dh4 needle clip second to top, 3.0 cutout valve, 2.0 air jet, and 30 pilot, and ended up 350 main, now my timing is up on the advanced end, and i had a air box on it with out the rubber insert that goes in it. I got a uni pod air filter to put on instead,bit the snow went away so have not tried it with the filter yet, but it ran great, and was scary fast for a little sled, and the plug looked to be a little on the rich side after running it for a few hours. now this is a range whip so im NOT sure whats the story with the exhaust with them, don't now if there more like a sting or a whip exhaust. someone told me that my exhaust gives better performance that a whips, but not my words, I just picked the sled up because it was a easy restore. but im sure a 400 and 440 cuyuna are fairly close in jetting, close in displacement, and same porting. lets us know what works when you figure it out as I got a 440 im going to rebuild this summer. also do you have the angled plug head or straight plug head on that motor? Im not sure if that makes a difference.
Eric
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tkjoe
L3 The Proven Snowmobile that never lets you down
Posts: 117
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Post by tkjoe on Mar 18, 2017 16:21:59 GMT -5
My range whip 400 is close to Eric's, it has a 6DH4 needle, 159QO needle jet, 3.0 cutout 330 main 30 pilot stock air box, runs good,I would think they should run good on the 440's too.
Joe
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Post by oldscorpman on Mar 18, 2017 19:44:40 GMT -5
Rick my 400 range whip i rebuilt this winter is 159Q0 needle jet, 6dh4 needle clip second to top, 3.0 cutout valve, 2.0 air jet, and 30 pilot, and ended up 350 main, now my timing is up on the advanced end, and i had a air box on it with out the rubber insert that goes in it. I got a uni pod air filter to put on instead,bit the snow went away so have not tried it with the filter yet, but it ran great, and was scary fast for a little sled, and the plug looked to be a little on the rich side after running it for a few hours. now this is a range whip so im NOT sure whats the story with the exhaust with them, don't now if there more like a sting or a whip exhaust. someone told me that my exhaust gives better performance that a whips, but not my words, I just picked the sled up because it was a easy restore. but im sure a 400 and 440 cuyuna are fairly close in jetting, close in displacement, and same porting. lets us know what works when you figure it out as I got a 440 im going to rebuild this summer. also do you have the angled plug head or straight plug head on that motor? Im not sure if that makes a difference. Eric thank you everyone for the reply's. eric this is a straight plug 79 whip engine. i am going to mount it as is and do some running on the stand tomarrow. we got 15'' of snow on monday and rain all day friday so my 3 acres is pretty sloppy to do a test ride, temp's in the 50's the next 5 day's. rick |
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