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Old 10-24-2017, 07:18 AM   #6
Cartmaster
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Join Date: Feb 2007
Location: United Kingdom
Posts: 2,456
Default Re: 2007 ST350 won't fire

I will jump in here. If it is the twin cylinder robin engine then Meimk is probably spot on. These engines are designed with soft valves to highlight poor filtration on the intake. Whip the plastic top off the head and adjust valve lash to .004 thou (if you do not know how to do this, check back here and ask ) . If you find that the two inner valve gaps are tight, then this is your problem, the two outer exhaust valves will most likely be fine. If you do not have feeler gauges, then loosen the adjusters, wind them back in till they just touch the top of the valve, then rotate exactly 1/4 turn back out and lock off. This will be enough to start the engine until you can set them up with feelers.

If you find this was your problem, then put all the old stuff back on that you have replaced and get your money back.

Good luck.
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