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Old 06-06-2009, 08:46 PM
spilde24 spilde24 is offline
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Default 440cc yamaha snowmobile engine on grasshopper atv

ive built two go karts, one mini bike, and restored two others all at the age of 15, and now i want to get away from the usual go kart/mini bike build and build a grasshopper atv. here are the online plans http://www.scribd.com/doc/9792071/Grasshopper-ATV-Plans i plan on using a 440cc snowmobile engine (it calls for a 5 hp) and its drive system. now the way ive seen the drive train set up on snowmobile karts is as shown in the video is this the best way to do it? or what other ways are there? please give me your advice as im sure there are many people out there with lots of experience with snowmobile karts

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Old 06-07-2009, 05:46 AM
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Thats the only practical way to set it up, but trust me, with a 440 in that little thing you will constantly be on your back, that things got over 10x the hp the plans call for.
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Old 06-07-2009, 06:16 AM
modelengineer modelengineer is offline
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Yeah, it will not be quick because any power you put down will flip you over, unless you made it like 3m long like a drag bike and then its just lame.
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Old 06-07-2009, 06:34 AM
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You will have to do a lot of modifications to that frame so that it would hold up to any engine.

theo
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Old 06-07-2009, 12:54 PM
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ok, well lets say i gear it way down to only go 30-35 mph because i dont plan on doin much with it beside muddin/ usin it on the farm, is it going to put me on my back even then? and yeah that frame will need some big modifications to house that big of an engine, but i didnt plan on following the plans exactly, i also was playing with the idea of making the whole thing bigger than in the plans
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Old 06-07-2009, 02:17 PM
88s10Durango 88s10Durango is offline
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I seen a vid on Youtube last night with the same atv , it was bigger and carried a 300 lb guy , it went okay but with the 440cc you have , the front suspension will twist , it will need double A-Arms , will need to be lengthened some ,, with the 440 you`ll need a somewhat large gas tank ,, even if you gear it low for the 35 MPH its going to wheelie and go over backwards on ya ,, I think a motorbike engine from 125cc to 250cc would be more appropriate for that ATV , my .02 cents worth ,, Bill
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Old 06-07-2009, 02:39 PM
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I wouldnt go above 125cc bike engine, if you gear the sled engine low it will just have more torque and you WILL flip over at the blip of a throttle. A sled engine will twist the frame from torque and it just wont be good at all. My 100cc 4 stroke bike engine that was on my kart broke a few welds from torque.
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Old 06-07-2009, 04:29 PM
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ok well thanks for all your help, ive been discussing this with my dad also and we are maybe going to plan for some sort of offroad buggy
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Old 06-19-2009, 03:03 PM
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you are gonna flip
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Old 06-19-2009, 07:49 PM
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Gear it as low as you want but 440 engines are very powerfull. Your going to flip.
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Old 06-19-2009, 07:59 PM
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Those old 440's do have decent power, but its not as uncontrollable as these guys are saying. The old ones were pigs, trust me. If you want to put it in that frame, reinforce it, and you'll be fine. I don't know why everyone is discouraging you, its a great project. You'll have alot of power, but it wont be one blip of the throttle and your going over backwards.
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Old 06-19-2009, 08:11 PM
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thanks crazycart, i still think it would be a great project, just dont have the funds to pursue this project as i just bought a new kart, possibly when i finish up fixing my new kart i may start on the atv, only time will tell...but thanks again man
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Old 06-19-2009, 08:13 PM
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I guess some of the old, like 70's old would be better, a lot of them didnt have the best throttle response either, so that would help...kinda. But thats still over 25hp and some of those oldies could pull up thier front ends, so imagine that on a bike. My friends dad's polaris 295 could lift up the front end.
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Old 06-19-2009, 08:51 PM
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Wheres the fun in no wheelies?
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Old 06-19-2009, 09:47 PM
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Just like theres no "I" in team theres no "wheelies" in Hospital lol.
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Old 06-19-2009, 10:18 PM
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lmao!^
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Old 06-19-2009, 10:19 PM
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i liked the idea as long as its controlable
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Old 06-19-2009, 11:27 PM
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Quote:
Originally Posted by jr dragster Tyler View Post
Just like theres no "I" in team theres no "wheelies" in Hospital lol.
yeah theres wheelies in hospital when my grandpa was still kickin and in the hospital i would get a wheelchair and do wheelies for him ahaha.
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Old 06-19-2009, 11:40 PM
88s10Durango 88s10Durango is offline
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I say Go for it , why do they use alot of Big Blocks in Dragsters ?? You just got to learn when to use the Skinny Pedal ,,,, has its advantages when power is needed if you use it right , mudding would be a blast !!!!!! Up hill climbing , running flat out on the dunes , I`de Do It ,,,,,
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Old 06-20-2009, 02:19 AM
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and flipping it is a bad thing, put a wheelie bar on it and it will be the most awesomest thing ever......
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