Quantcast
Jump to content


2017 KYMCO 450i SxS Engine problem?

JSACH

By JSACH
in Kymco UTV SxS Forum

 Share

Recommended Posts

JSACH Newbie

JSACH

Posted
Posted

Machine has a clatter / rattle at start-up, lacks power and doesn't run very well.  A mechanic I talked with has just repaired another KYMCO with similar symptoms and the cam shaft had a flat lobe. Anyone else have or know of this soft cam issue?  Getting parts right now is also a problem.

Link to comment
Share on other sites
Ben1098 Enthusiast

Ben1098

Posted
Posted

The cam follower's "slipper pad" was the problem in some units I worked on.  The cam was ground square but the rubbing pad mating surface was NOT parallel .  Result was the valve spec gap went from zero on one side to excessive on the opposite side.   Think of a well abused grinding wheel before truing it back up.  High contact pressure OR a lubrication problem failure.  Check head for blocked oil passages.  Seen silicone sealant "goobers" from previous repairs get  chopped up in the oil pump only to block off oil passages.  Check for above.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Topics

    • Browner010
      2022 Coleman outfitter 500 had a loud snap then a metallic grinding noise
      By Browner010
      Recently I had an overheating issue on my 2022 Coleman Outfitter 550 (Hisun UT550) and to check to make sure it was fixed I took it out for a ride around the block. After a couple cycles on the LED coolant meter, I took it for a couple mile ride and on my way back I heard a loud metallic snap then a grinding noise. It was still able to move under its own power but very slowly. I was about 2 blocks from the truck so 'I limped it home and up onto the trailer. I know I need to tear it apart and look for what broke, but anyone have a guess as to where to start? I'm seriously getting tired of this damn machine! 750 miles on it and already replaced the belt, wet clutch, primary clutch, clutch roller weights among a few other things. Seriously, this friggin machine has spent more time on the lift than on the road. I thought I bought this new because it was from the owner of a tractor supply, but he registered it under the stores name making me the 2nd owner voiding any and all warranties.
      Any Ideas what to look for would be appreciated.
      Thanks
    • John M in Louisiana
      Hisun E1 Power Plug Replacement
      By John M in Louisiana
      Quick question about replacing the plug.  One of the prongs pulled out, so I'm thinking it will be an easy fix to connect the old cord with a new plug but I'm unsure about the specs.  15amp 125v?  Is it more complicated than that?  I do plan to buy a plug that's water tight.
      Thanks in advance!
    • felo72
      24 Massimo Buck 250 Parking Brake Issue
      By felo72
      Hello all. I purchased a brand new Massimo Buck 250 EFI in June for our farm and I've had the parking brake fail on me twice. I have approximately 250 miles on the vehicle. The first time was less than a month after receiving the UTV. We all of a sudden lost brake pressure and it would not start. I tracked the issue back to the parking brake. Upon removing the chain cover, I noticed the brake pad was missing and the caliper piston was touching the rotor. I found a set of brake pads online and replaced them myself. It's worked for several months and just happened again. Seems like a design flaw. I'm reaching out to see if there's an upgrade option available, or if I should replace the entire caliper with the brake pads? Thanks in advance for any advise.
      I submitted a warranty claim, so I'll keep this updated with what Massimo replies.
      When I replaced the brake pads the first time, back in July, my Son made a video on YouTube to show the unique caliper design. Here's a link if you wanted to check it out:
       


    • Fishing Wiskers
      2012 Axis 500 4x4, no power going up hill
      By Fishing Wiskers
      Top speed is 30mph on flat grass ground.  but it will not go up minor hills forward or reverse without a runing start.  If you start at the bottom of the hill machine will stop about 1/2 way up.  I have the engine cover off and you can see the outside of the drive clutch will stop spining., and the engine does bogg down some.  Dosent matter if engine is cold or warmed up.  Seat belts are connected.  Fuel is clean
      I am the 5th shop to look at it and different shops have replaced the fuel pump, injector, ign coil, wet clutch, 
      I am not sure how to check for codes with this machine,  can anyone teall me how to do it?
       
      Compression with hot eng is 145,  valves adjusted to .005 with a cold engine.  Dash shows 426 hours
      I am not convinced it's an engine problem
    • Fast Free Shipping on All Orders Over $50
    • A P
      2022 Hisun Sector 550 eps. Power steering not working
      By A P
      Hi
      I have a 2022 hisun sector eps 550. 30amp fuse is blown for eps. Checked the motor and it’s fine. Opened up the controller and found a bad diode. Dealer wanted 500$ for the controller. Just posting this in case it helps someone. I couldn’t read numbers from the old one so just took a guess and replaced it with a 100v 3amp diode. 

UTV FORUMS

MORE SECTIONS

FOLLOW US ON

GET IN TOUCH

  • Automotive Webmaster
×
×
  • Create New...