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Old 01-26-2014, 05:30 PM
jgolds jgolds is offline
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Hello, I recently picked up a Carter Trailrunner (I think?) frame and busted up Tecumseh engine for $200 (pic attached). The decal on the floor pan was in pretty rough shape, but it looks like it says "runner" after "Trail" anyways. Not wanting to deal with the Tecumseh, I picked up the 420cc Predator. That engine is significantly wider that what was in there before so the jackshaft there currently is too short. I saw some longer ones online, but they aren't threaded. What's the deal? Do I need to take it to a machine shop or something? Why wouldn't they come threaded? Am I missing something stupidly obvious here? Thanks!
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Old 01-26-2014, 05:35 PM
Poboy kartman Poboy kartman is offline
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to the forum and please fill out your profile, it'll come in handy sooner or later. .....
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Old 01-26-2014, 05:40 PM
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not all jackshafts are threaded as long as it has a key slot for a keyway your good. make shore whatever you put on the jackshaft has a set screw and the same size key slot as the jackshaft.
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Old 01-26-2014, 05:55 PM
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E.g you can put a locking collar (5/8"? bore) on it instead of nuts on it.
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Old 01-26-2014, 06:52 PM
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Quote:
Originally Posted by rocketkart View Post
...slot for a keyway
The slot IS the keyway
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Old 01-26-2014, 06:54 PM
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ok, good to know, thanks! I'm sure I'll be back with more questions. I took it to a guy who hacked it together very poorly, it worked for basically a day, now the belt just slips in the torque convertor and receiver and I don't go anywhere unless someone pushes me off, and even then it's slow until the belt can grip enough to get going. I figured a 420cc motor would get me cruising pretty good. He rigged it to make it work with the short jackshaft instead of just ordering one the proper size, it's a mess.

Now I am trying to undo the damage and fix it myself now that I understand how it's supposed to work. I'm sure i'll be back soon enough, thanks for the responses.
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Old 01-26-2014, 07:16 PM
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Depending on what size engine/TC you have now, keep in mind that, if you go to a 420 Predator, you may need to spend big bucks on a 40 series TC
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Old 01-26-2014, 07:19 PM
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Already bought the 40 series driver and driven. He hooked it up all wonky. I just need to figure it out.
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Old 01-26-2014, 07:22 PM
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Ok, well, throw us some pics & we'll see how we can help
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Old 01-26-2014, 07:23 PM
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Quote:
Originally Posted by Fabroman View Post
The slot IS the keyway
Thanks alot Mr.know-it-all...... Now I can't ask "What's a key weigh?" ...
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Old 01-26-2014, 07:25 PM
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An ounce or two, depending on size
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