Comments on: BMX To Motorcycle Conversion http://www.motormayhem.net/2007/06/26/bmx-cycle/ By Gearheads for Gearheads Wed, 10 Mar 2010 11:55:58 +0000 http://wordpress.org/?v=2.5.1 By: miles http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-4090 miles Tue, 11 Aug 2009 06:16:56 +0000 http://www.motormayhem.net/2007/06/6/#comment-4090 Sorry for the confusion. What I meant by clutch that the sprocket is welded to is the one way mechanism that allows you to pedal the bike and then stop pedaling (or moving the pedals) with the bike still in motion. You must weld this mechanism solid before installing the sprocket. The only real clutch is on the engine drive shaft. Sorry for the confusion. What I meant by clutch that the sprocket is welded to is the one way mechanism that allows you to pedal the bike and then stop pedaling (or moving the pedals) with the bike still in motion. You must weld this mechanism solid before installing the sprocket. The only real clutch is on the engine drive shaft.

]]> By: john29302 http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-4088 john29302 Tue, 11 Aug 2009 05:33:14 +0000 http://www.motormayhem.net/2007/06/6/#comment-4088 dude...you said you "Upon further inspection I realized that the clutch I had welded the sprocket onto (BMX gear) is a ....." then ya said "What do you mean? The clutch is on the engine not the sprocket." sooo...ya musta meant you welded a #35 sprocet to your rear bike sprocket?? i told em twice down at the battered womens shelter...but they already been told twice......good luck and thanlks for great pictures but get the tech writing stuff sane please dude…you said you “Upon further inspection I realized that the clutch I had welded the sprocket onto (BMX gear) is a …..” then ya said “What do you mean? The clutch is on the engine not the sprocket.” sooo…ya musta meant you welded a #35 sprocet to your rear bike sprocket?? i told em twice down at the battered womens shelter…but they already been told twice……good luck and thanlks for great pictures but get the tech writing stuff sane please

]]> By: JimYoungbird http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-864 JimYoungbird Sat, 27 Dec 2008 21:53:47 +0000 http://www.motormayhem.net/2007/06/6/#comment-864 Nice job, but.....you need to weld in some gussets at the neck joints. Thats an awful lot of welding up there and the gussets will keep it all together. Much safer too. Otherwise....MOTOR ON!!!! Nice job, but…..you need to weld in some gussets at the neck joints. Thats an awful lot of welding up there and the gussets will keep it all together. Much safer too. Otherwise….MOTOR ON!!!!

]]> By: miles http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-606 miles Mon, 20 Oct 2008 01:36:31 +0000 http://www.motormayhem.net/2007/06/6/#comment-606 It has brake and throttle on the handlebars. The clutch is a centrifugal clutch. It has brake and throttle on the handlebars. The clutch is a centrifugal clutch.

]]> By: Scott http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-597 Scott Sat, 18 Oct 2008 15:12:54 +0000 http://www.motormayhem.net/2007/06/6/#comment-597 hi, just woundering, does he bike has a clutch and accelorator like a real motorbike. (on the hanle bars)????? hi, just woundering, does he bike has a clutch and accelorator like a real motorbike. (on the hanle bars)?????

]]> By: My Newest Bike - OldMiniBikes.com Forum http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-571 My Newest Bike - OldMiniBikes.com Forum Wed, 08 Oct 2008 03:03:30 +0000 http://www.motormayhem.net/2007/06/6/#comment-571 [...] out to be defective, but the welds do have good penetration and are strong. Just not pretty. Motor Mayhem Blog Archive BMX Cycle Let me know what you [...] [...] out to be defective, but the welds do have good penetration and are strong. Just not pretty. Motor Mayhem Blog Archive BMX Cycle Let me know what you [...]

]]> By: miles http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-548 miles Sun, 21 Sep 2008 17:46:15 +0000 http://www.motormayhem.net/2007/06/6/#comment-548 Yes it has enough power to climb reasonable size hills. I used an old briggs and stratton flathead and I believe it only revs to 3500 rpm. I am sure a 2-stroke can go much faster than that. Yes it has enough power to climb reasonable size hills. I used an old briggs and stratton flathead and I believe it only revs to 3500 rpm. I am sure a 2-stroke can go much faster than that.

]]> By: PowerOfCheese http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-547 PowerOfCheese Sat, 20 Sep 2008 22:57:50 +0000 http://www.motormayhem.net/2007/06/6/#comment-547 I was wondering about the gear ratio. Does this have enough torque to climb decent hills? Also, what is the max RPM's for that engine (im comparing it to my 3hp 2-stroke snowblower engine) I was wondering about the gear ratio. Does this have enough torque to climb decent hills? Also, what is the max RPM’s for that engine (im comparing it to my 3hp 2-stroke snowblower engine)

]]> By: miles http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-506 miles Thu, 04 Sep 2008 05:33:30 +0000 http://www.motormayhem.net/2007/06/6/#comment-506 I got my rear sprocket from http://www.ebay.com just search "go kart 72 tooth sprocket". Yes the chain does rub on the left hand fork for the rear tire. To solve this on my bike I just cut a section of the tubing out there. You can see this in this picture http://www.motormayhem.net/wp-uploads/2007/12/dscn4459.JPG . In the picture the chain is in front of the section cut off but that is because the chain is off the rear sprocket. When the chain is on the rear sprocket it runs smoothly in that cutout. I am pretty sure this greatly weakens that support, so I do not recommend that solution. To fix this correctly you would need to move the location where the chain goes around the motor (clutch) down so when the chain is tight it is at a less steep incline going to the rear sprocket and thus running under the rear fork. You might be able to achieve this by using a shorter motor or a larger bike and lowering the engine in relation to the rear sprocket. But you will need to determine the correct height based on you setup/bike. You could also experiment with running the chain inside the fork rather than outside it. This would eliminate the need to cross the rear fork at all. Feel free to ask me something else if I didn't make it clear. Thanks, Miles I got my rear sprocket from http://www.ebay.com just search “go kart 72 tooth sprocket”. Yes the chain does rub on the left hand fork for the rear tire. To solve this on my bike I just cut a section of the tubing out there. You can see this in this picture http://www.motormayhem.net/wp-uploads/2007/12/dscn4459.JPG . In the picture the chain is in front of the section cut off but that is because the chain is off the rear sprocket. When the chain is on the rear sprocket it runs smoothly in that cutout. I am pretty sure this greatly weakens that support, so I do not recommend that solution. To fix this correctly you would need to move the location where the chain goes around the motor (clutch) down so when the chain is tight it is at a less steep incline going to the rear sprocket and thus running under the rear fork. You might be able to achieve this by using a shorter motor or a larger bike and lowering the engine in relation to the rear sprocket. But you will need to determine the correct height based on you setup/bike. You could also experiment with running the chain inside the fork rather than outside it. This would eliminate the need to cross the rear fork at all.

Feel free to ask me something else if I didn’t make it clear.

Thanks,
Miles

]]> By: Adrian http://www.motormayhem.net/2007/06/26/bmx-cycle/#comment-500 Adrian Wed, 03 Sep 2008 17:11:32 +0000 http://www.motormayhem.net/2007/06/6/#comment-500 In the one photo it looks as if the chain rubs on the tubing that connects the left hand side of the wheel if what can be done to improve the design. Where can i look for a rear sproket In the one photo it looks as if the chain rubs on the tubing that connects the left hand side of the wheel if what can be done to improve the design. Where can i look for a rear sproket

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