Quantcast
Jump to content

Massimo 500 wont start, Got Fuel, Dry spark plug


Recommended Posts

  • Alex changed the title to Massimo 500 wont start, Got Fuel, Dry spark plug
23 minutes ago, Lance Darbonne said:

Massimo 500 wont start.  Pulled the injector and when i turn the key it sprays a lot of fuel, but the spark plug is dry.  What would be my next step?  Valve adjustment?

You need three things to run an ICE: fuel (a proper air/fuel mix), compression and a spark at the correct moment. One of those is missing. 

Easiest thing to check next (if you have not yet) is for a spark. OHC valvetrains rarely wear themselves tighter (s o tight as to not close and not allow some compression)--not what I'd check next...

 

Link to post
Share on other sites

As I alluded to above, with an engine that was  running reasonably well before a starting problem valve adjustment would likely be the last thing I'd check--just yank the plug and test the compression. If an intake or exhaust  valve is not closing tightly the cranking compression will be rather low (likely <100 psi)...

Link to post
Share on other sites

Thanks Guys, the thing that was puzzling me was that the injector was sending fuel, but the spark plug remained dry, which is why i asked about valve timing, but it does make sense what cliffyk said.

When i pulled the injector, it didn't really send a fine mist, but wasn't a solid stream, but it is sending fuel.   What would cause that fuel not to go into the cylinder?

Link to post
Share on other sites
7 minutes ago, Lance Darbonne said:

Thanks Guys, the thing that was puzzling me was that the injector was sending fuel, but the spark plug remained dry, which is why i asked about valve timing, but it does make sense what cliffyk said.

When i pulled the injector, it didn't really send a fine mist, but wasn't a solid stream, but it is sending fuel.   What would cause that fuel not to go into the cylinder?

That is perplexing--Check the spark and compression. Is there a smell of gas in the cylinder? I have seen "no-start" EFI systems where the fuel just ran down the cylinder wall and into the crankcase--does the oil smell of gas?

  • Like 1
Link to post
Share on other sites
  • 1 month later...

Guys, I want to thank you for all of your help, as well as let you know what the problem was.  I went on an out of state trip after my last post, so hadn't had time to get back on this unit until lately.  During my initial troubleshooting, i was on the drivers side working on the unit and my granpa was on the other side.  When i went back to verify the injector had a good spray pattern, i was not getting any fuel out.  I wiggled something and it started spraying again.  I leaned over to look at the fuel pump and noticed fresh oil.  Traced it to the oil filter which was barely hanging on.   

So, the whole problem was an oil filter with the wrong thread type was installed.  It screwed on, but over time, and with vibration, came loose and fouled the threads on the filter.  After it started spewing oil, i guess the low oil sensor was engaging causing the bike to dye intermittantly, until the oil was never able to reach the sensor.  I ordered a new filter, installed, and topped off the oil, and now she is running great.

The only thing i wonder is why i was getting fuel and fire with pretty much no oil?   I would figure that the sensor would kill the fuel or the fire???

Link to post
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.
Note: Your post will require moderator approval before it will be visible.

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.

  • Similar Topics

    • By calebcobb1994
      There is no spark to plug and no power to fuel pump. I can run a direct ground to fuel pump to get power but still no spark at plug. Any ideas to what could be wrong? thanks!!
    • By Ann hays
      Hi, new member here, thanks for the ad. Our 2012 hisun hs 500 utv turns over but won't start unless primed. It'll run then for a few seconds & shut back down. It's just not getting fuel. Things we've done, installed brand new fuel pump, fuel pump relay, starter selonoid, replaced all the small fuses in fuse container...10-15 & 3 amps. Replaced a few Butt Connectors a 30 amp. Fuse for headlights. Tapped up some electrical wiring. Nothing has helped. It always started instantly. At a loss as to what to do next. Any suggestions would be so appreciated. TIA. Ann 
    • By Markky
      Can’t seem to figure out my Coleman 550 outfitter no start issues. Machine turns over and starts for a brief second and shuts right off. Had error code for fuel injector and has since “been changed. Next code it’s throwing is E 118, coolant/oil temperature sensor circuit high voltage or open”. I believe I’ve located the sensor right near the head of the motor. All wires seem to be clean and tight on the plug end. Any suggestions or has anyone ran into a similar problem. Thanks everyone 
    • By AdamG
      I have a 2015 (EFI) Hisun Forge 110 atv that has no spark or injector pulse.  I have replaced the Stator/pickup coil and ECU and still can not get anything.  I have brought it to 3 different Hisun Service centers and no one can figure it out.  The last service center said they can get a very "weak" spark but that is about it.  I consider myself pretty knowledgeable about engines but this one has me (and 3 Hisun service centers) stumped.  I just uploaded the service manual for this machine.  Any help or advise that you can give is going to be much appreciated!
      110 ATV Service Manual.pdf
    • eManualOnline
    • By Cap Dodaa
      Looking for the tork specs for the fuel injectors. RTV900 G
  • Similar Tagged Content

    • By JohnnyB
      My Massimo 500 will not start. I’ve checked all the obvious things. It turns over just fine. fuel, spark, fuse box are all good. I can’t figure it out. Any ideas would be greatly appreciated. Thank you.
    • By Sgriger534
      I have a MSU 500 and sometimes it acts sluggish in 4x4 and you can smell hot gear oil. 
      I'm Thinking it is something binding up the the transfer case or front differential but before I dig into it I wanted to see if anybody had a similar problem.
       
      Thanks, 
    • By owencole15
      Massimo 500 will only crank when I jump solenoid with screwdriver cranks right up and runs great. But won’t start with key doesn’t do anything when I turn the key. Only thing it does is power everything as in dash and fuel pump then have to jump solenoid to crank up and drive. 
    • By Andy
      I have a 2015 Massimo 500 that idles really high and it will not let me shift into gear while it's idling. Not sure where to start. Also it will bog down and stall constantly. Starts right back up everytime. Advice please. 

×
×
  • Create New...