Why not one more. Snowmobile engine board track "replica"

Hurco550

Keep er' Between the ditches
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Re: Why not one more. Snowmobile engine deadtail

deviant said:
This is cool, man. I'm enjoying learning about these motors.
Thanks. These little engines are almost to simple. No valves of course, but even beyond that they are engine design at its simplest form. They were kind of the German equivalent to a Briggs and Stratton. 2 stroke though. Made for reliability more so than power. Rated at 15 h.p. at 5000 rpm. Im going to do a little exhaust port work, mostly just cleaning up the rough casting as well as modify a 250cc dirtbike expansion chamber to fit. With those mods I may get up to a whopping 17 h.p. lol. My thought though is that if it will move a 350 lb. snowmobile 30 m.p.h. with all of the rolling resistance of the track, it should be able to motivate a small motorcycle up to 55mph with the right gearing. all of this is guessing only of course.
 

treitz

New Member
Re: Why not one more. Snowmobile engine deadtail

This should be fun. Will have to follow along.
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

Well, since I have to weld on the hardtail, and I'm hoping a full custom frame is in the project lineup in the future, I figured it's time to make a frame jig. Had a bunch of extra square tubing around that's straight with 7/16" holes every inch on center. It will be all bolt together and almost infinitely adjustable. I'm trying not to do a hack job so it will be able to be around for a while.





Gotta have some brackets water jet cut to make it all hold together.
 

ridesolo

You only bear responsibility for your own actions
Re: Why not one more. Snowmobile engine deadtail

VonYinzer said:
I'm glad you are getting the blame for this one, usually he manages to find some way to blame me for his harebrained ideas genius schemes.
 

Tune-A-Fish

BOTM LOSER Proudly Deplorable
Re: Why not one more. Snowmobile engine deadtail

Now I know why I was avoiding this thread :-\ I'm worse than a kid in Toys R Us... I want I want !!
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

ridesolo said:
I'm glad you are getting the blame for this one, usually he manages to find some way to blame me for his harebrained ideas genius schemes.
If there is ONE thing that I won't be able to blame you for, it's a hard tail lol
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

Tune-A-Fish said:
Now I know why I was avoiding this thread :-\ I'm worse than a kid in Toys R Us... I want I want !!
Get ya one man lol it will be cheap when it's done, and I know you got time =p lol
 

VonYinzer

Active Member
Re: Why not one more. Snowmobile engine deadtail

ridesolo said:
I'm glad you are getting the blame for this one, usually he manages to find some way to blame me for his harebrained ideas genius schemes.
All I did was ask for a pic of the frame. That's it. He's the one who went all loony with snowmobile engines and whatnot. Lol.
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

VonYinzer said:
All I did was ask for a pic of the frame. That's it. He's the one who went all loony with snowmobile engines and whatnot. Lol.
Ha
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

So, this is what happens when you can't get the clutch off. Start cutting.
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

So, I spent some time tonight with a plasma cutter, air hammer, puller and a torch and finally got that clutch lose. Engine torn down. Gonna split the cases tomorrow and see if my crank is trashed.



I think I found where the pto crank play was coming from.....



Nice thing is I can still get crank bearings, full winderosa gasket set and oversize piston and rings for less than $100 to my door
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

VonYinzer said:
So...





















































Done yet?
Yeah, took me a bit to reply cuz I was out riding it. Little more tuning to do, but she runs ok.
 

Hurco550

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Re: Why not one more. Snowmobile engine deadtail

O.S. Piston, crank bearings and seals and full gasket set ordered and on the way for $90.91 shipped to my door. I know an oldschool speedway racer that still bores cylinders for $35 a hole and does nice work. so, with all the labor done myself, I can have a full rebuilt engine for around $125. That seems pretty cheap to me =)
 

Hurco550

Keep er' Between the ditches
DTT BOTM WINNER
Re: Why not one more. Snowmobile engine deadtail

Here is a video of the same motor idling in a snowmobile. I will definitely need rubber motor mounts.

http://youtu.be/1p7IXfyzPNE
 

ridesolo

You only bear responsibility for your own actions
Re: Why not one more. Snowmobile engine deadtail

hurco550 said:
Here is a video of the same motor idling in a snowmobile. I will definitely need rubber motor mounts.
Why? You're putting it into a hardtail frame, so how come you'd be worried about a little vibration? ;D

Are you going to do a torque converter and a jack shaft, mini bike style or are you going to primary belt/chain it into a transmission?
 
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