66cc bicycle engine kit: will not start


  #1  
Old 02-22-19, 01:59 PM
K
Member
Thread Starter
Join Date: Feb 2019
Location: usa
Posts: 3
Received 0 Votes on 0 Posts
Angry 66cc bicycle engine kit: will not start

So me and a pal of mine have both build 66 bicycle engine kits onto our bikes. he got his built long before i did and he told be hes tried everything he could and it would not start. eventully i got mine assembled and tried to start it.. i did eventully get it running (it was just an air adjustment) so he brought his bike over and we tried for a whole day and we could not get it to start let alone even pop. we have made sure several times everything is perfect and as it should be, Gas, spark, air, compression and still nothing. (note its a two stroke so timing is not the issue) t as many times as we had taken everything apart and tried to start it i cant belive we cant even get a single fire. we KNOW there is gas and air going trough as it should so the only possible ting it could be a this point would be spark. strange though because we checked the spark plug by holding it to the cylander head and turning over the engine. so we know we have everything we should. the only possible thing we can think of at this point with all the tests we have done is that for some reason its not sparking when inside the cylander and under compression..... it is a GT6 racing bicycle engine kit. please help were getting kinda mad now that nothing works....
 
  #2  
Old 02-22-19, 02:37 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 62,135
Received 1,523 Votes on 1,406 Posts
Welcome to the forums.

You say it's an engine kit. Does that mean you built the engine ?
 
  #3  
Old 02-22-19, 03:15 PM
A
Member
Join Date: Aug 2015
Location: USA
Posts: 656
Received 27 Votes on 26 Posts
looks to be some different variations so not sure if this applies to you but looks like the magneto magnet can be installed backwards would check that and the air gap first.
https://www.youtube.com/watch?v=_90eVXQn9jM
other possibilities is the engine is flooding and getting to much fuel but if you continue to dry the plug off and remove excessive fuel from cylinder by cranking it over with the plug out you can usually get the engine to pop or try to run.
have seen coils that would show spark but would be to weak to run the engine also.

since you both have the same kit you could probably start swapping parts and find the problem could be as simple as a bad spark plug.
 
  #4  
Old 02-23-19, 05:09 PM
A
Member
Join Date: Mar 2010
Location: USA
Posts: 4,481
Received 134 Votes on 123 Posts
I have gotten stubborn lawn mowers and snow blowers to start using starting fluid.

Not sure of the theory behind that but I suspect that the carburetor needed some help getting the flow of gasoline vapor going. Or maybe it does not start but the behavior with the starting fluid gives you a hint at what is wrong such as bad carburetion.
 
  #5  
Old 02-27-19, 10:18 AM
K
Member
Thread Starter
Join Date: Feb 2019
Location: usa
Posts: 3
Received 0 Votes on 0 Posts
yeah we assembled it. it had all the parts we just put it togelther
 
  #6  
Old 02-27-19, 10:33 AM
K
Member
Thread Starter
Join Date: Feb 2019
Location: usa
Posts: 3
Received 0 Votes on 0 Posts
To alan73, Yeah my bike would not start at first and it was just a simple air screw adjustment. so we have turned his all the way in and out and still no pop. so after what we tested we concluded it had to not be sparking inside the cylinder. yeah that is what we will try next, swapping out parts. also we have already tried swapping spark plugs, his plug still worked just fine in my moped but even with my spark plug in his it would not start. Thanks for all the tips! also to AllanJ, we have already tried starting fluid and checked the carb a few times and it all looks good.
 
 

Thread Tools
Search this Thread
 
Ask a Question