New Coils and Plugs, Now Hard to Start!

[bk10s]

I'm replacing the coils on a Vanguard 350777, 18HP. I can't get on the coil bolts with a socket because the flywheel is in the way. Use a 5/16 box wrench? Thank you!

 

[mechanic mark]

Hollow Shaft Metric Nut Driver Set, 7 Piece

Amazing deals on this 7Pc Metric Nut Driver Set at Harbor Freight. Quality tools & low prices.

www.harborfreight.com

Your Vanguard is all Metric, made in Japan.

 

[bk10s]

I may have been wrong on 5/16. Could it be 9/32? Metric? maybe 7mm?

 

[StarTech]

Being a M4 x 23 JIS flange head hex screw the normal wrench size is 7mm.

 

[bk10s]

Got them off easy with a 7mm box wrench. Thanks to all!

 

[bk10s]

Replaced both coils and 2 new Champion RC12YC plugs. Runs GREAT, and no more pop pop pop when increasing the rpm when hot. BUT.....Engine used to start easily when cold before replacing coils and plugs. Now difficult to start. Turns over easily. What changed????????

 

[bk10s]

I used a piece of paper folded in half to cap the coils from the flywheel.

 

[mechanic mark]

Use a Business Card, gap is .010 for coils. Adjust valves with engine cold .005, intake & exhaust valves .004 - .006. Did you use OEM B&S Coils per your Engine Model #? Post Model xxxxxx, Type xxxx, Trim xx, Code xxxxxxx from engine Data Plate. thanks, Mark

 

[bk10s]

So, you're thinking that I do not have enough gap on the coils? Adjusted the valves to .006 prior to replacing coils and started easily. Am I taking that damn shroud off again?......GRRRRRRR

I did use OEM coils. 350777 1152-E1 99102111

 

[mechanic mark]

Absolutely yes, a Business Card will work perfect between ears on coils. Patience, you have a Commercial Engine. Inspect engine cooling fins thoroughly for being clean. Let us know how it goes, thanks, Mark

Results

www.briggsandstratton.com

I posted Manuals above, you may have them already, thanks for posting, Mark