2 stroke 2 cylinder
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Post Fiend
Joined: Jan 2004
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From: Elkhart IN
2 stroke 2 cylinder
will a 2 stoke engine start without an exhaust? im thinking that it wont, but want to make sure. i put the 2 cylinder 440 cc 2 stroke engine off my old yamaha snomobile onto my honda odessy, and i havent put the exaust on it yet, but the stupid thing wont start. got spark, fuel, so im not sure. thanks guys.
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Joined: Nov 2004
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From: North Dakota
Isn't an Odyssy like a small offroad go cart? If its what I'm thinking, a 440 snowmobile engine will turn it into a real screamer. Some of the guys I used to work with would take 600-700cc sled motors and mount them in modified/extended three wheeler frames. The last one I watch run was at the drag track and the damn thing ran over 114mph in the 1/8th, I can't remember the E/T. That particular one had a 650 wildcat engine that was hot rodded. We also had a guy bring a twin turbo V-max 4 in to get tuned because he couldn't get the dang thing to run right. I never got to see it run down the track but it sure was a screamer out in the parking lot, lol.
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Post Fiend
Joined: Jan 2004
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From: Elkhart IN
torque, the odessy is a oversized gocart, this 440 should be plenty of power. http://www.off-road.com/atv/pilot/images/350400.jpg the engine ran good and strong when i took it off the snomobile, and now that is on the odessy, i have hot spark, fuel on the plugs, and smoke comming out of the header, but no bang. i was thinking that without the exhaust, since its a 2 stroke the fuel might be going all right back out the exhaust port.
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Joined: Nov 2004
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From: North Dakota
Thats exactly what I was thinking, is the fuel staying where it needs to be? does it even try to start, or is there nothing? How do you know you have fuel? are the plugs wet when you pull them? also on the sparky sid eof things have you pulled the plus and laided them against the head to make sure you have enough spark or did you just use a tester on the wire?
Also the picture of the odessy was exactly what I was thinking, a 440 sled engine will be plenty stong in one of thoses things, I take it your using the snowmobile clutch assembly too?
Also the picture of the odessy was exactly what I was thinking, a 440 sled engine will be plenty stong in one of thoses things, I take it your using the snowmobile clutch assembly too?
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Post Fiend
Joined: Jan 2004
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From: Elkhart IN
when i pull the plugs, there is a small amount of fuel on them. thats how i tested for spark, laid them on the head, bright white spark. since i can see fuel comming out the exhaust, im thinking its just going straight through. i guess ill have to pull the exhaust off the snomobile and see if i can get it to start with it on there. yes, the odessy has the same kind of belt drive setup, so it was pretty much a drop in, all i had to do was make raised engine mounts, and now i have to rig up a exhaust, since the header is pointing straight at the back of the seat, im going to try to reuse most of the stock exhaust, so well see how it works out.
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Joined: May 2006
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From: Edgerton, WI
It will start without the exhaust, but you had better have some earplugs in, becuase its going to be very loud.
That engine should be plenty of power for your Oddysey. It should put out about 70 hp, which should be plenty of motor to move that little Oddy.
That engine should be plenty of power for your Oddysey. It should put out about 70 hp, which should be plenty of motor to move that little Oddy.
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Joined: Dec 2001
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From: Ontario, canada
That sounds like a fun project.
Did you run the engine in the snowmobile?
You generally need some backpressure in a snowmobile to get it to start.
The exhaust is part of the overall tuning on a 2-stroke.
Too little backpressure is the same as running the carbs too lean
too much backpressure (blocked exhaust) can cause a blown crank seal.
Keep an eye on the spark plugs when you get it going and don't be surprised if you need a quite a big jetting adjustment.
You may want to look at adjusting the clutching too, as an odyessy is much lighter and has less drivetrain drag than a sled.
Did you run the engine in the snowmobile?
You generally need some backpressure in a snowmobile to get it to start.
The exhaust is part of the overall tuning on a 2-stroke.
Too little backpressure is the same as running the carbs too lean
too much backpressure (blocked exhaust) can cause a blown crank seal.
Keep an eye on the spark plugs when you get it going and don't be surprised if you need a quite a big jetting adjustment.
You may want to look at adjusting the clutching too, as an odyessy is much lighter and has less drivetrain drag than a sled.
Elder User
Joined: Jul 2005
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From: Hudson Florida.
If its pushing fuel out the exhaust, it sounds like its getting too much fuel. possibly a needle stuck open, something like that. two stroke motors will run without a muffler though, but as Deere Daze said, it will be LOUD. my old Mac 250 is a testament to this. straight stack off the exhaust port, and its not quiet.
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Post Fiend
Joined: Jan 2004
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From: Elkhart IN
i ran the snowmobile up and down the alley before i pulled the engine off, so i know it runs. i pulled the seat off the odd and hooked up the exhaust, and still no avail. im not sure what to try next.
Cargo Master
Joined: May 2003
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From: Earth
Originally Posted by JD717
Is it sitting on the same angle as it was when mounted in the snowmobile? if its got a float carb, this will make a big difference if it isnt on the same angle.
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