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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine


Heat shields and exhaust questions

4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine


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Old 04-23-2012, 01:56 PM
cdavid67 cdavid67 is offline
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Default Heat shields and exhaust questions

Hello all,

I spent some time researching these topics before I decided to start this thread. As you may know, I am still gathering parts for my build before I start assembly.

My 1st question is: Can you remove the heat shields and goofy plastic covers from the HS 49cc engine without causing problems?

2nd: My engine came with a lawnmower looking exhaust and no pipe in the Grubee kit. Is this normal? I ordered an exhaust pipe from AGK so I don't want the stock pipe. Just curious more than anything. I guess I just need to unbolt the stock muffler looking box and throw it out?

Thank you.
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Old 04-23-2012, 02:15 PM
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Smile Re: Heat shields and exhaust questions

Welcome to the forum Yes you can remove shields and shrouds but it isn't recommended. As long as you're moving while the engine is running, over heating shouldn't be much of a problem.

No pipe in the Grubee kit? There should have been one but not to worry if you're gonna use an AGK exhaust for your build. Yes, just unbolt the stock muff and the AGK will bolt right on (use the stock exhaust gasket).

Have fun with your build and let us see some pics!

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Old 04-26-2012, 12:43 PM
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Default Re: Heat shields and exhaust questions

My kit didnt come with a exhaust pipe ether, just the ugly can. and i removed all my shrouding, and made a coffee can shroud for the flywheel following silverbears tutorial.
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Old 04-27-2012, 09:29 PM
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Default Re: Heat shields and exhaust questions

They usually do come with the pipe so the can is weird, Maybe their getting even cheaper
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Old 04-28-2012, 08:37 AM
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Default Re: Heat shields and exhaust questions

I have seen 2 engines that were bought seperately (different vendors, engine only) come with the 'can' exhaust
they are very restrictive
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Old 04-29-2012, 10:32 AM
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Default Re: Heat shields and exhaust questions

I used the stock exhaust from the 212. Welded a pipe extension,(3/4" curved electric conduit) to bring muffler out of the way. Covered the whole thing with hand formed aluminum sheet to keep from burning my leg.
http://motorbicycling.com/showpost.p...4&postcount=39
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