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High Performance Bicycle Engine Tips and Motorized Race Bicycles We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds

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  #91  
Old 10-22-2016, 04:47 PM
Sam90lx Sam90lx is offline
Motorized Bicycle Senior Member
 
Join Date: Sep 2015
Location: Ventura CA
Posts: 62
Default Re: kings motors gt 80

Quote:
Originally Posted by streak View Post
Its called four stroking
Think mine has this issue as well. May be time to put a KTM 50 in there.😀
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  #92  
Old 10-24-2016, 01:47 AM
Neptunati Neptunati is offline
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Join Date: Jun 2009
Location: Kansas city
Posts: 44
Default Re: kings motors gt 80

I got my gt80 up to 35 mph, GPS verified. That was with the crappie flex pipe exhaust and 41 tooth sprocket. I got a kx80 exp chamber lined up to be welded on next. Looking to get to 40 mph and beyond.
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  #93  
Old 11-20-2016, 12:37 AM
mike carter 2 mike carter 2 is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2011
Location: west virgina
Posts: 122
Smile Re: kings motors gt 80

well, ive ridden all spring through summer,at least 1000 miles.this bike has been my only transportation.absolutly no trouble with the gt80 engine.runs better now than it ever has.i realy like this little engine! if you have folowed this thread you know what i have done to it. i would realy like to hear about your builds and mods that you have done, o yea,almost forgot ,bike pulls from about 2 or 3 mph to around 40 !!! thanks and i just hope that you have had as much fun as i have
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  #94  
Old 01-30-2017, 09:50 AM
Mikey_ Mikey_ is offline
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Join Date: May 2016
Location: GA
Posts: 35
Default Re: kings motors gt 80

Nice! I'm just getting back into this now-- About a year later. I'm glad to know that the GT80 works. I think that I might not order it in a kit but just get the motor and add the parts that matter for performance.

I will likely build on a Slugo frame and use a jackshaft.
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  #95  
Old 02-24-2017, 10:17 PM
turbobike turbobike is offline
Motorized Bicycle Newbie
 
Join Date: Jan 2017
Location: NY
Posts: 2
Default Re: kings motors gt 80

My GT80 has just the reed, no spacer, ported cylinder from Kings, modded stock pipe on a Schwinn Dodger 40 tooth on 700 series wheels... 65 keihin main jet... Stock unmarked jet mic'd at 70 jet size. I'm 220lbs it has gps'd at 44 mph on a slight downhill 38 on a flat. Pulls no peddling from 2-3 mph. Couldn't be happier...

Last edited by turbobike; 02-25-2017 at 10:42 AM.
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  #96  
Old 02-25-2017, 01:14 PM
mike carter 2 mike carter 2 is offline
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Join Date: Nov 2011
Location: west virgina
Posts: 122
Default Re: kings motors gt 80

sounds like it runs great,are you still running the flex exaust?my bike couldnt breath through it.it was way to small.i even tried porting the mounting flang and building exaust from 1 inch conduit.still not good.found a suziki rm 60 x pipe on line and ordered a header pipe from fred c.in my opinion its the best lookin, best made header to use when useing a factory style pipe.the pipe realy woke my bike up!
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  #97  
Old 02-25-2017, 07:44 PM
turbobike turbobike is offline
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Join Date: Jan 2017
Location: NY
Posts: 2
Default Re: kings motors gt 80

That's my next consideration. I do like how the stock pipe fits my setup though. I did have a concern a real expansion chamber might be to loud. If I lived in a free state (not NY) it wouldn't be a second thought. Have you seen a nice small silencer that fits your pipe?
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  #98  
Old 02-26-2017, 08:33 AM
mike carter 2 mike carter 2 is offline
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Join Date: Nov 2011
Location: west virgina
Posts: 122
Default Re: kings motors gt 80

i just made one.it works pretty good
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  #99  
Old 02-26-2017, 08:39 AM
mike carter 2 mike carter 2 is offline
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Join Date: Nov 2011
Location: west virgina
Posts: 122
Default Re: kings motors gt 80

i think i just cut the one off the pipe that came with the kit and modded it to fit
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