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Hison engine in side by side

M

mnoliverguy

Member
My son has a Hison engine that he has been working on and now wont start. New rings, new plug, 125psi.compression lots of spark checked valves and reseated them, also set valves lined up timing marks, Tried diff. plugs sometimes will try to fire but no go. Any Ideas would be welcome. Thanks
 
If you have spark and fuel you most likely have it timed to the exhaust stroke rather than the compression stroke. (180? off) If you have the firing order correct.
 
If it were mine and felt confident in timing, I would try starting on propane.
 
All any engine needs to run is compression, fuel under compression and spark at the correct time.

The way I check the timing to get it out of the way is to turn the engine by hand watching for a spark to the block for number one cylinder on the compression stroke. When I see spark I want stop turning by hand to see TDC on the timing marks. If you see this and you know you have compression your problem is fuel.

Engines of all kinds cold times at TDC.

If it starts at an idle but will not accelerate it could be in the advance.
 
Is there an anti-backfire solenoid in the base of the carb, and, if so, is it getting power when the ignition is switched "ON" and during cranking?
 
give it a squirt of starting fluid -- if it runs on that then its not getting any gas -- good luck -- Roy
 
Well I would say run Forrest Run from any Hanson product but that was not your question. It sounds like you have compression and THINK you have it in time. So that just leaves fuel. Are the spark plugs getting wet at all??? IF not then spray some fuel into the intake and see if it will fire. IF the plugs are wet an you have compression and spark it has to be a timing or ignition issue.

My youngest son works on these type of motors. HE says he has ran into these knock offs that are not marked correctly as far as cam and ignition timing. So you need to figure out static timing/TDC on the compression stoke. Then see if the plug is firing at that time. If your lucky it will be 180 degrees off. IF it is some other amount that it is harder. LOL

IF the firing is off then you could have a bad coil/igniter. That can easily be firing late. Also it may fire the plug at ambient pressure but not under compression.
 
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