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 Post subject: 150cc howhit engine cranking problems
PostPosted: Sat Sep 03, 2016 10:36 pm 
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I have a yerfdog rover scout it has the 150cc howhit engine in it. When i try to start it it will turn over but it does`t turn over good. It gets to a spot and struggles to turn over. It acts like the starter clutch is not engaging the starter gear. I replaced the starter clutch and the starter and oil pump and it is still doing the same thing. It will turn over and i am getting good spark and only fire a few times but now it won`t start. Could there be a bearing inside that is bad. I have also set the valves any help would be appreciated. It would start before I changed out the starter clutch.


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Sun Sep 04, 2016 1:24 am 
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Is the starter cable getting hot brushes may be worn down in starter.just a thought

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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Sun Sep 04, 2016 6:01 am 
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Pull the CVT cover and the spark plug and turn it over by hand, if it feels free then as Pud says I would look at the starter.

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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Sun Sep 04, 2016 12:25 pm 
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I already put a new starter on it and it still does the same thing. I thought it could be the battery but I hooked up jumper cables to it and it didn`t make any difference . It just acts like it doesn`t have enough rear end to start it. The starter cable does get hot when I crank it alot


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Sun Sep 04, 2016 2:40 pm 
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Does it turn over fast with spark plug out?
Do a comp test

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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Sun Sep 04, 2016 8:22 pm 
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It turns over fast with the spark plug out I will check the compression tomorrow I have to get a compression tester just curious do you know what the compression should be


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 5:27 am 
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About 150psi
I believe the thread for the spark plug is 10mm

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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 4:14 pm 
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I tested the compression in the cylinder and it was at 89 does any body know what it should be when its cold or could somebody hook me up with a service manual for this it is a Yerf Dog Rover Scout with a 150cc HowHit engine


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 4:52 pm 
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sorry Funnyman I didn`t see where you said 150psi does this mean I need to rebuild this engine


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 4:56 pm 
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roverman wrote:
sorry Funnyman I didn`t see where you said 150psi does this mean I need to rebuild this engine


Did you make sure throttle was wide open wine you checked compression?

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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 4:58 pm 
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no I will do that now


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 5:09 pm 
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just checked compression with throttle wide open and made no difference it is still at 90 psi


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 6:05 pm 
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Drop a little oil into he spark plug hole and do another reading. If compression goes up, you have worn rings. If compression is the same, it is a valve problem.

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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 6:41 pm 
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I just put oil in the spark plug hole and did another compression test and no real change it is at 90psi now. I did set my valves at .005 would that be it or do i need to go in just wondering what my next step would be . Thanks for all the help by the way from everybody


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 7:07 pm 
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Did it spin over fast with the tester in or the same with the spark plug
.005 on valves are fine

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Joyner 650 SS
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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Mon Sep 05, 2016 7:46 pm 
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It spins over fast with the tester in


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 Post subject: Re: 150cc howhit engine cranking problems
PostPosted: Thu Sep 08, 2016 10:03 pm 
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Are you sure tha motor is actually spinning fast
Ive had an startr clutch key shear so the engine would spin occasionally

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Joyner 650 SS
Red and black Redline Riots


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