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 Need help!! New engine not turning over 
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Post Need help!! New engine not turning over
GTR 25 Subaru engine replaced with brand new 35 vanguard marine carb.

Fully charged battery, engine turns over 1/4 to 1/2 turn very slowly and stops. Every time I hit the key.

It has oil, no fuel to motor yet. Just turning it over to check everything after engine swap.

I can turn the prop by hand, nothing seems bound up at all.

Any suggestions?


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1652 modV 35GTR


Wed Mar 09, 2022 8:52 pm
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Post Re: Need help!! New engine not turning over
Update, pulled the plug that of the engine hit the key and the engine spins.

13.6v batt. With spark plugs in it drops to 8.5v. With spark plugs out it only drops to 10.5 while spinning which is acceptable. But still spins over very very slow.

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1652 modV 35GTR


Thu Mar 10, 2022 6:40 am
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Post Re: Need help!! New engine not turning over
Called B&S “advanced technical support”. That was a complete waste of time. “Never heard of that”.

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1652 modV 35GTR


Thu Mar 10, 2022 8:45 am
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Post Re: Need help!! New engine not turning over
Just my .02. Make sure you have good connections on the wire going from key to starter solenoid. If you don’t get enough juice to solenoid, starter won’t turn strong. Had that happen on my 23. I read similar issues on here. Search gtr click.


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Thu Mar 10, 2022 1:01 pm
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Post Re: Need help!! New engine not turning over
Matt, I’m going to put a new battery in just in case. I did replace the battery cables with this engine. I will recheck my ground this evening as well. Hopefully that’s it.

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1652 modV 35GTR


Thu Mar 10, 2022 2:46 pm
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Post Re: Need help!! New engine not turning over
Checked all my grounds. Not dropping any voltage on them when starting. Replaced my battery just in case. NO CHANGE. No response from the company I ordered it through and zero help from Briggs. Like, fing zero.

Soooooo, starter or brand new engine is f’ed. no idea. It will be who knows how long before I can get a warranty starter I guess.


Any ideas from anyone…….

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1652 modV 35GTR


Thu Mar 10, 2022 5:49 pm
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Post Re: Need help!! New engine not turning over
You Can try to jump the solenoid by putting a long handled screw driver across the solenoid posts. That puts power direct from the battery to the solenoid and bypasses the key switch wiring. That would tell you if you have any issues in the harness. Not sure if you can jump across the starter itself.. if not you can probably take the starter to an auto parts store and they can test the starter. If starter checks out, look as the solenoid. If both solenoid and starter are good, it’s gotta be harness wiring.


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Thu Mar 10, 2022 8:21 pm
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Post Re: Need help!! New engine not turning over
Did that in the beginning and same. No change. I found a guy an hour away that has a starter. I’m going over there tomorrow morning and going to swap them and see if that fixes the issue. If not I’m pulling the engine back off and will be fighting Briggs for a replacement.

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1652 modV 35GTR


Fri Mar 11, 2022 3:57 am
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Post Re: Need help!! New engine not turning over
Clutch was bound up somehow. Took everything apart and put it back together and everything is kosher. Now to figure out where my brand new fuel cell is leaking air and not letting me get fuel to the bulb…………

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1652 modV 35GTR


Fri Mar 11, 2022 9:35 pm
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