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| Our Forums | | | | Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles | muffler in the way Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. My pedal is hitting my stock muffler any suggestion can I heat it up and bend it some or does ...  | | 
06-12-2009, 05:58 PM
| | Motorized Bicycle Senior Member | | Join Date: Jun 2009 Location: north carolina
Posts: 62
| | muffler in the way My pedal is hitting my stock muffler any suggestion can I heat it up and bend it some or does anyone have a better idea and maybe some pics Thanks Beetle Juice  | 
06-12-2009, 06:13 PM
|  | Custom Builder / Dealer | | Join Date: Mar 2008 Location: Los Angeles, CA.
Posts: 2,166
| | Re: muffler in the way You can try "slotting" the mounting holes a little to move the pipe out of the way... | 
06-13-2009, 08:04 PM
|  | Motorized Bicycle Elite Member | | Join Date: Mar 2009 Location: Top of NY
Posts: 1,788
| | Re: muffler in the way i raised the motor on mine until it clear the peddals.
so i guess you can rotate or raise the engine for clearance.
its easier to make a engine mount out of scrap metal,but you can heat the muffler pipe and bend it so it will fit better,but i never tried that. | 
06-13-2009, 08:07 PM
| | Motorized Bicycle Newbie | | Join Date: Feb 2009 Location: miramichi
Posts: 14
| | Re: muffler in the way Just slot the manifold holes a bit and rotate your muffler | 
06-13-2009, 10:18 PM
|  | Moderator | | Join Date: Sep 2008 Location: Littleton, Colorado
Posts: 2,665
| | Re: muffler in the way Clamp the flange in a vice between two pieces of wood and bend the pipe until you get the clearance you need. If your pipe/muffler is chromed then using heat will ruin the plating. It can be bent cold all you need is a little arm strength and patience. Don't be too aggresive just tweak a little at a time until things fit.
Tom
__________________ Age and Treachery Will Always Triumph
Over Youth and Skill | 
06-13-2009, 10:23 PM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: Maine
Posts: 237
| | Re: muffler in the way I used my blow torch to heat it red hot, then used a pair of monkey wrenches to bend it.
I have a black muffler, and it buggered up the paint a bit. But I had a can of high heat black spray paint laying around which made it look like new again  | 
06-14-2009, 10:24 PM
|  | Motorized Bicycle Senior Member | | Join Date: Mar 2009 Location: Pittsburgh, PA
Posts: 81
| | Re: muffler in the way I had to bend my exhaust pipe too ‘cause the peddle hit it. I tried to bend it cold, but couldn’t ‘cause the steel bench that my vise is attached to wasn’t heavy enough to keep it from moving. When I tried to heat the pipe to bend it, I found that my blowtorch didn’t make enough heat, so I used my welding torch on it and heated the pipe until it was red hot and the pipe bent with little effort. The heat burnt the factory paint off so I cleaned up the burnt area and painted the whole exhaust pipe with flat black Rust-Oleum High Heat paint. If you do the same, clean and rough up the unburnt paint as well or the new paint will peal when heated during normal operation of the engine. I didn’t think to do that so my new paint is pealing from the original paint. The new paint is sticking well to the area of the bend. Using an infrared thermometer, the bend of the exhaust gets up to about 200 deg F and the muffler part gets hotter than 400 deg F (the limit of my instrument), which may have something to do with it too. | 
06-14-2009, 10:37 PM
| | Motorized Bicycle Senior Member | | Join Date: Jun 2009 Location: north carolina
Posts: 62
| | Re: muffler in the way Great job I have got to get a hotter torch also
Did you change the acron head bolts for nuts | 
06-14-2009, 10:58 PM
|  | Motorized Bicycle Elite Member | | Join Date: Aug 2008 Location: Tucson, AZ USA
Posts: 869
| | Re: muffler in the way I just used a regular Ace Hardware propane torch and could heat it hot enough to bend. It just takes a little time. It does mess up the chrome but you can ride the bike!
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I'm not lost, I'm exploring! | 
06-15-2009, 06:59 AM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: Maine
Posts: 237
| | Re: muffler in the way It does take a while with the regular hardware store propane torches. It took about a minute for mine to get red hot. And then even longer to have it red hot all the way around. The whole operation took probably 7 or 8 minutes. But it is worth the patience  | | Thread Tools | | | | Display Modes | Linear Mode |
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