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2019 Hisun Sector 550 Hard Starting

kgs

By kgs
in Hisun UTV SxS Forum

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kgs Apprentice

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.

  • Alex changed the title to 2019 Hisun Sector 550 Hard Starting
kgs Apprentice

kgs

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Any help on this at all would help thanks, I bought OEM parts to put on it. My next thing to check if this don't work is check my valves to see if they need adjusted, but taking the cover off to rotate motor looks like a pain in the but to get to.

aefron88 Community Regular

aefron88

Posted
Posted

I would check the valves and replace fuel filter before throwing parts at it.

The fan cover isn't that bad, and you can get away with just pulling the top bolts and flexing it a little.

Pull the spark plug and the engine is easy to spin by hand.

kgs Apprentice

kgs

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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.

kgs Apprentice

kgs

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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.

aefron88 Community Regular

aefron88

Posted
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You may very well have zero lash. Back off the adjusters and go from there. As long as it's off the cam lobe you should be ok to adjust em.

 

Yes this may cause a hard/no start situationnloss of power, poor runbing, etc. If the valves are slightly open you will loose compression.

kgs Apprentice

kgs

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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

kgs Apprentice

kgs

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Well adjusted the valves to 5 thousands, now it runs like when I first bought it. Turn the key fires right up and idols on it's own, very happy man. Thanks for all the help.

kgs Apprentice

kgs

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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. 

kgs Apprentice

kgs

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Yes I hope I do, I only use it to haul corn to feed deer, so it don't get abused driving it hard in woods. I've been told the motor in the sector 550 is the same motor in the sector 750 and supposed to be a good motor in the hisun utvs.

  • 11 months later...
joe1 Newbie

joe1

Posted
Posted
On 10/14/2022 at 2:08 PM, kgs said:

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.

I have the same issue with mine right now done change the same parts and no luck if you happen to figure it out help would be appreciated 

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kgs Apprentice

kgs

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Posted

I had the same problem, it was my valves that got to tight.

Adjusted both valves to 3 thousands and now starts right up and idols good.

  • 7 months later...
  • 3 weeks later...

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