2008 26hp B&S V-Twin Cranks Hard!

Hobo,NC · Apr 11, 2018

I have ran into a single cylinder Briggs that had a bad compression release I was wondering if the V-Twin used them also. This one acts just like those with a bad compression release (camshaft).
Its not my mower its my aunt's she ask me to replace the battery because it melted one of the post on the bat... I put a AC-Delco 300 CCA battery in it replaced the cable ends hit the starter I thought it was locked up it hit hard did not crank. After a few try's it cranked normal I may go out to it now it may crank normal it may act like its locked up. When it dose not crank the starter pulls 300 amps. I have not tried to adjust the valves I am not sure what the spec on it should be I am thinking 4/5 tho...

Model 44P777 (that's all I have can not find more #'s)
Type D13-G-1
Code 080117YG

Southern Ray · Apr 11, 2018

A starter with worn out bearings/bushings will also cause it to drag.
Her ten year old mower has endured many cranks and the starter may be worn.
I would check the starter before digging into the engine.

marloweg · Apr 11, 2018

gas in the cylinder from stuck needle valve in carb

Steve@Advance · Apr 11, 2018

The valve clearance is .004-.006 for in and ex. Best look at the pushrods, be sure they are straight and the ends good.

As others said, could be the carb flooding, filling the cylinders, especially if it starts without choke and blows black smoke. If the carb is flooding, the oil will be overfull with gas contamination.

And could be the starter is worn. Check for excess side play in the upper bushing.

retired farmer · Apr 11, 2018

Check for gas in the oil due to faulty carburetor. Got one that did that, carb electric shut off wasn't working and would empty gas into the oil.

Gene Davis (Ga.) · Apr 11, 2018

The piston on a V-twin Briggs must be turned 1/4" past TDC before adjusting the valves. Do it this way for both
cylinders. This gets it over the compression release bump on the camshaft.

JMOR · Apr 11, 2018

(quoted from post at 22:33:13 04/11/18) The piston on a V-twin Briggs must be turned 1/4" past TDC before adjusting the valves. Do it this way for both
cylinders. This gets it over the compression release bump on the camshaft.

o true.........& I will add that such compression release scheme is a real band-aid POS!

VicS · Apr 11, 2018

My X-Mark cranked this way,when new. Took
it back to dealer. They put a new battery
in. Still didn't crank right. I finally saw
the trouble. The bolt was in backwards in
the positive cable. It has a carrage bolt
in the post.and the post has a aquare hole.
The bolt wasn't actually tightening the
cable.

NIK OWEN · Apr 11, 2018

ADJ VALVES, & GO MOW...JUST BELIEVE...BE BLESSED, GRATEFUL, PREPARED...

JF in MI · Apr 12, 2018

Ditto on that but if so, after it starts, it usually acts like a mosquito fogger.

Hobo,NC · Apr 12, 2018

(quoted from post at 08:33:13 04/12/18) The piston on a V-twin Briggs must be turned 1/4" past TDC before adjusting the valves. Do it this way for both
cylinders. This gets it over the compression release bump on the camshaft.

I will give that a shot. BTW its not a fuel issue its a compression release, valve are stater motor issue. I have not seen anywhere were the V-twin used a compression release incorporated with the camshaft. I am trying to build a battle plan to go after the issue I just need the time I don't like working on my own small engines much less someone else's

....

BarnyardEngineering · Apr 12, 2018

There's definitely a compression release on the V-twin Briggs, as I have one. I just couldn't tell you how it works if I tried.

K Effective · Apr 12, 2018

I will echo the valve adjustment advice, I had gotten to the point of building and installing a battery box big enough to put a car-sized battery in my Woods mower, just for cranking power. When I heard of the valve adjustment I was skeptical, but it sure worked great! I do not recall going past TDC, but there are several YouTube videos that show how to do it.

Bob Bancroft · Apr 12, 2018

My engine has to be close in age and size to yours. I complained to the dealer enough, they finally told me to check valve adjustment. That was it. Take this with a lot of salt, because I'm pulling it from memory, and your engine may well be different. I recall the valve clearance being around .010-.012. Some of them needed to be more like .004-.005. So of you can find the proper procedure and clearances for your engine, you should get positive results.

Hobo,NC · Apr 12, 2018

Adjusted the valves so far after about 20 starts cranks normal :shock: Before it was luck of the draw to get it to crank over once started you better not cut it off are it would be hard to get the starter to crank it over......Exhaust was on the tight side intake on the loose side. As far as I can tell it does not have a compression release...

2008 26hp B&S V-Twin Cranks Hard!

Hobo,NC

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Southern Ray

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marloweg

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Steve@Advance

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retired farmer

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Gene Davis (Ga.)

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JMOR

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VicS

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NIK OWEN

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JF in MI

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Hobo,NC

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BarnyardEngineering

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K Effective

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Bob Bancroft

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Hobo,NC

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