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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 11-12-2016, 11:22 PM
crassius crassius is offline
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Default Re: got a bad one here

yeah, I use a water spray as it is also good for cooling while running on the bench

I though about the base gasket even tho is wasn't seeping oil because when cooling the motor, I seemed to get a slight reaction when spraying down there.

not enough to be sure something was bad, but it is very clean now and I'll see if anything shows up - motor keeps getting smoother as it runs tho, so maybe a dried out gasket will re-wet itself after running enough and seal OK again

I'd like to figure this out as this is now second one after sitting 6 to 8 months.
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  #12  
Old 11-13-2016, 12:28 AM
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sbest sbest is offline
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Default Re: got a bad one here

A couple plates to block off the intake and exhaust, one with a Schrader valve and the other with a nipple to a low pressure gauge will answer a lot of questions about case leaks. I pump it up to 5psi and see how long it holds and where it leaks.

I was just burned by a tank filter plugged up with gummed up evaporated fuel.
It would leak enough fuel to run for a bit and then die.
There was always fuel in the carb when I got it back to the shop. Finally I check line flow.

Steve
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  #13  
Old 11-13-2016, 11:19 AM
crassius crassius is offline
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Default Re: got a bad one here

true, I've never bothered to set up for leakdown testing, as keeping cost below what a new motor would cost is the usual goal - anything more than 2 hours labor is half the cost of new motor with no more problems
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  #14  
Old 11-13-2016, 08:03 PM
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sbest sbest is offline
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Default Re: got a bad one here

Things always seem to start out simple and then go sideways.
When they go sideways, a leakdown test is a good place to start on a worn motor.
2 plates on, a couple pumps with a bicycle pump and check for leaks.
10 min tops, learn so much.

The KTM and Blaster engines are much more complicated, especially to install and remove. I usually leak test them before installation of even a new motor.

Steve
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  #15  
Old 11-13-2016, 10:26 PM
crassius crassius is offline
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Default Re: got a bad one here

fortunately, I've only seen 2 like this in all the years and many hundreds of bikes - if I determine that it is base gasket, then I can lift up top end and put non-hardening permatex there for a nice $10 fix - if it is tarry residue in bottom of case, then it's run it till it clears or new motor
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