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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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  #11  
Old 10-09-2016, 08:42 PM
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Tyler6357 Tyler6357 is offline
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Default Re: New Motor Destroyed

The RT carb has a very thin gasket to keep the float from leaking. Make certain it is in the groove around the top of the float before putting it back on and tightening it down, it can easily get out of place when you have it off.
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  #12  
Old 10-09-2016, 09:00 PM
BobbyT BobbyT is offline
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Default Re: New Motor Destroyed

That wire looks exactly like the upper part of the choke spring in my SHA 15/15 carb. I use and recommend bekits. I haven't had any problems. Why did you change the carb?
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  #13  
Old 10-10-2016, 04:17 AM
bluck bluck is offline
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Default Re: New Motor Destroyed

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Originally Posted by Tyler6357 View Post
The RT carb has a very thin gasket to keep the float from leaking. Make certain it is in the groove around the top of the float before putting it back on and tightening it down, it can easily get out of place when you have it off.
The gasket is still intact on the RT carb, I was able to solve my leak problem by untightening the bolts a tad bit.
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  #14  
Old 10-10-2016, 04:24 AM
bluck bluck is offline
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Default Re: New Motor Destroyed

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Originally Posted by BobbyT View Post
That wire looks exactly like the upper part of the choke spring in my SHA 15/15 carb. I use and recommend bekits. I haven't had any problems. Why did you change the carb?
Yeah bekits makes top notch kits. I have ordered 3 motors from them, this is the engine that I started having problems with. I have built 7 bikes and currently have 4 motors just sitting not being used (not counting my ktm50 motor and the one on my red bike). Also a blown engine that was running perfectly fine and just decided to blow itself like this one(motor had 1,000+ miles). I changed the carb because the RT carb is said to be a tad bit better by some and with the better air filter and higher quality I thought I'll give it a go.

Btw which choke cable are you referring to? The one on the previous picture?
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  #15  
Old 10-10-2016, 04:27 AM
bluck bluck is offline
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Default Re: New Motor Destroyed

So I will be rebuilding the top end once more. My question is should I open up the bottom end? If so how difficult is that or even recommend? Or should I try to swirl the bottom end with a half cup of gas to get rid of metal bits that's might be stuck in there? (Which is what I did before this one blew and apparently there was something in there)
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  #16  
Old 10-10-2016, 10:46 AM
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Default Re: New Motor Destroyed

When in doubt, always open the bottom end up.
It is a 30 minute job with these motors, well worth doing for peace of mind.
Unless you don't mind buying yet ANOTHER top end and doing it next time?

Steve
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  #17  
Old 10-10-2016, 12:11 PM
crassius crassius is offline
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Default Re: New Motor Destroyed

I'm still thinking circlip - in the pic it looks like same thickness and seems to be lined up right where the circlip sits in piston

pics are hard to tell from, and circlips are fairly heavy to have come up from bottom, but there might have been two in the piston for some reason

it may remain a mystery - I'd disassemble that motor and keep it for spare parts
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  #18  
Old 10-10-2016, 10:23 PM
bluck bluck is offline
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Default Re: New Motor Destroyed

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Originally Posted by sbest View Post
When in doubt, always open the bottom end up.
It is a 30 minute job with these motors, well worth doing for peace of mind.
Unless you don't mind buying yet ANOTHER top end and doing it next time?

Steve
Would I need special tools and also need to buy extra gaskets? I will try it first on one of my old blown motor that I use for spare parts
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  #19  
Old 10-10-2016, 10:29 PM
bluck bluck is offline
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Default Re: New Motor Destroyed

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Originally Posted by crassius View Post
I'm still thinking circlip - in the pic it looks like same thickness and seems to be lined up right where the circlip sits in piston

pics are hard to tell from, and circlips are fairly heavy to have come up from bottom, but there might have been two in the piston for some reason

it may remain a mystery - I'd disassemble that motor and keep it for spare parts
I don't think it was a circlip as when I took out the piston it was only 2 and when I put the new one it only had two. The only reason I don't want to make this a motor just for parts is that I have 2 already that I use for parts I do not plan to have 3. Each spare parts motor is also of different types so I would actually like to save this one. I will give it one last go I will wash the bottom end with gas and swirl it 3 times. If I find out how to open the bottom end I will do so as well and after that I will just hope for the best if it blows then it most likely will become a spare motor sadly for such a new pk80 engine.
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  #20  
Old 10-12-2016, 03:45 PM
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sbest sbest is offline
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Default Re: New Motor Destroyed

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Originally Posted by bluck View Post
Would I need special tools and also need to buy extra gaskets? I will try it first on one of my old blown motor that I use for spare parts
You need the little threaded puller that comes with a new kit and a lot of patience the first time around. A complete gasket kit is less than $10 here in Canada. Don't pry or use excess force. Once you know what you are doing it takes less than an hour to remove the engine from the frame and completely disassemble it.

Start with a clean bench, have a container for small parts. Don't lose the ball bearing or buck bar. Take pictures and ask when you get confused.

Good luck!
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