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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
Have I blown up my motor?
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. Well I finally had it going great. I got the SBP Tuned pipe and it was screaming. But I went ...  | | 
07-01-2009, 10:14 PM
|  | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: NEWCASTLE
Posts: 127
| |  Have I blown up my motor?
Well I finally had it going great. I got the SBP Tuned pipe and it was screaming. But I went out to start it and noticed it was hard to start and would not idle. Also there is no or very little compression. With the cluch out I can push the bike around the garage. Also when I get it going its very clunky, it will go ok for a while then just go CLUNK and stop. The fuel is 30:1 and fine. The plug is fine, very light charcol. The carb is perfect. I thought it was electrical as is goes ok but then going down a hill off the gas it just dies intermitenly. I started it up this morning for my son to have a listen and once I got it going all he said was "that sounds bad". Then CLUNK, it stopped. Still no compression.
So what should I do. I have been ringing its neck flat out a bit lately should I just replace the ring? What else should I look for when I have the head and barrel off? I was told to check under the clutch cover as I may have blown and oil seal? Are these hard to change?
Steve
Last edited by cyclepro101 : 07-01-2009 at 10:21 PM.
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07-01-2009, 11:02 PM
|  | Godfather of Motorized Bicycles | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 7,121
| | Re: Have I blown up my motor?
Sounds like you may have smoked it...look for scratches on the cylinder wall. You may get by with a new set of rings.
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If it ain't broke, and you mess with it long enough, it will be. |
07-02-2009, 12:40 AM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: NEWCASTLE
Posts: 127
| | Re: Have I blown up my motor?
There is just no compression. Its hard to tell if an oil seal is gone. How much should or would be leaking out behind the clutch if it was gone? |
07-02-2009, 07:43 AM
| | Motorized Bicycle Elite Member | | Join Date: Jun 2009 Location: ny,ny
Posts: 602
| | Re: Have I blown up my motor?
Quote:
Originally Posted by cyclepro101  There is just no compression. Its hard to tell if an oil seal is gone. How much should or would be leaking out behind the clutch if it was gone? | The seals, although important for operation, have little to do with compression. I would look at the piston, rings, and cylinder walls. Only takes a few minutes and tells a lot. Might be bearing gone and took the top end with it. Not costly to repair but sometimes better to just pick up a whole new engine for $75 and use old for parts. |
07-02-2009, 08:24 AM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: Have I blown up my motor?
Quickly pop the head off. Too easy. |
07-02-2009, 12:01 PM
| | Motorized Bicycle Elite Member | | Join Date: Mar 2009 Location: ridgway colorado
Posts: 262
| | Re: Have I blown up my motor?
sounds like broken rings or bad wrist pin bearings gotta pullthe head and jug |
07-02-2009, 08:00 PM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: NEWCASTLE
Posts: 127
| | Re: Have I blown up my motor?
OK But what am I looking for when I get the head and jug off? |
07-02-2009, 09:12 PM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: Have I blown up my motor?
Suspicious holes in the piston, alleged gouges in the bore, loose parts laying about....the usual suspects. |
07-02-2009, 09:40 PM
| | Motorized Bicycle Elite Member | | Join Date: Nov 2008 Location: new york city
Posts: 144
| | Re: Have I blown up my motor?
These engines are not good at screaming |
07-03-2009, 12:00 AM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: NEWCASTLE
Posts: 127
| | Re: Have I blown up my motor?
OK, Thanks team. Check this out. I also e-mailed back to my Aussie supplier and he said he will E-mail the photos to China and he will send me a new motor.
It looks like all the chrome came off the inside of the jug? Also there is bits of this metal? stuff in the bottom end too.
Steve | | Thread Tools | | | | Display Modes |  Linear Mode | 
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