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2019 Hisun Sector 550 Hard Starting


kgs

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Got a hisun sector 550 2019 that's got 5900 Miles on it, this year it started to getting hard to start in morning, once I get it started it works good the rest of the day. But to start it in the morning I got to hold the gas pedal to the floor and it will fire up. I replaced the fuel injector but didn't help it. So I just ordered a new air filter and 02 sensor and a maf sensor to put on it to see if this will fix it. Anyone else had this problem. I'm hoping the parts I ordered will fix it. I also bought a new battery to put in it also.

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  • Alex changed the title to 2019 Hisun Sector 550 Hard Starting
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Well turning motor fan counterclockwise until valve is at top then move fan another 3/4 turn to make sure the lobe is off valve. I don't have any room at all to put a gage in It. seems like it keeps contact and no opening. Would this cause it hard to start but run fine once started.

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I think I'm going to put it back together and see about taking it to a shop and let them adjust them. I don't want to mess something up. I have rotated piston up two different times to check clearance on the up stroke and I can't get a gauge in but the motor is cold.

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When I took my plug out it was toast, changed it last summer. You can see it's running rich. I put it back together and it fired up a lot easier with new plug, but I know the valves need adjusted there is 5900 miles on it. So there is only two valves intake and exhaust, so if I have my pistol dead top of stroke with valve up then it's ready to loosen and adjust, then repeat for next valve, I just want to make sure I don't want to do something wrong and it won't run. Probably don't need the part's I ordered but I will keep them. Here's picture of old plug.

IMG_20221015_134520187.jpg

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So if you have a hisun sector 550 it's a 4 stroke, which means the piston goes up twice before you get the compression stroke. Set piston TDC on compression stroke then adjust both valves to 5 thousands clearance. My utv runs like the day I bought it from this fix. 

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