Quantcast
Jump to content


YZF450 wont start


dwillouby

Recommended Posts

Hello, New to site. Working on a YZF450. refuses to start. Customer states motor was built with big bore kit, ported head, hotcams. Has hour meter showing 5 hours. Atv has many high end chassis parts and does look well built. Managed to start when first brought in but couldn't idle.  Had stripped threads in exhaust cam holder. Made repairs now wont fire at all Occasional pop. Checked cam timing , Good leak down, new plug, carb clean but haven't verified tune. Acts like no compression. Decompressor seems to work correctly Will not fire even by spraying starting fluid in carb. Have noted while cranking starter seems to slip. Don't know how fast it must spin to overcome decompressor? Contacted Hot Cams to get info but no response at all. Been working on bikes 30+ years but am stumped don't want to just throw parts at it.

Any ideas

Thanks

David

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.
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 Forum Topics

    • By HSTAR
      Hey I have a 1997 big bear 350 4x4
      I replaced the shifter shaft and the shift arm linkage and the rod when I installed them all I was unaware that you had to line the dot on the shifter shaft with the gap on the linkage arm gap put it all back  together and rode it I can't get it to shift in the right gears  I can move the shift cam by hand and goes in different gears but with the shifter shaft in it riding I can't put it in R or N 
      Anyone know how to line up the shifter shaft and the shift cam s
       
    • By ResQ91
      Hi guys
      My 87 Bear 350 won't start and could use a hand.
      Turn key on and Oil light turns on and then slowly fades out. (I think this is key to this) No start, not even a tick.
      battery and connections good
      A Solenoid post jump turns it over
      Neutral Safety Switch wire attached and seems good
      It has not had a wire/switch on Rear Brake Pedal ever since I had it.
      Any thoughts on some other things to troubleshoot this??
    • By 1998Zuki250
      Looking to see if anyone has any input on ATV Tires? 1998 Suzuki quadrunner LTF250
    • By Otter9099
      I plan on using my ATV to hunt. What have you found to be the best method for carrying your rifle that is secure and allows removing quickly to pursue an animal?
    • By utvboard
      2009 HONDA BIG RED
      Honda enters the MUV (multi-use vehicle) market with a side-by-side machine that leapfrogs the competition to set new standards in utility and recreation. With numerous automotive-based technologies, Big Red features a powerful 675cc OHV liquid-cooled PGM-fuel-injected single-cylinder engine and an automatic transmission with three selectable drive modes plus Reverse, front and rear independent double-wishbone suspension, a roomy cab featuring rubber-mounted bucket seats with adjustable backs, and a specially designed, highly durable, tilting cargo bed. A broad selection of Honda Genuine Accessories will also be offered.
      Big Red
      KEY FEATURES
      - Powerful OHV, liquid-cooled, PGM-fuel-injected 675cc, mid-engine design.
      - Automatic transmission with Reverse.
      2009 Honda Big Red in Camo
      - Three selectable drive modes.
      - Front and rear independent double-wishbone suspension for an impressively smooth comfortable ride.
      - Roomy cab and rubber mounted bucket seats with adjustable backs designed to comfortably fit a wide range of body types and reduce fatigue on long drives.
      Specially designed, high durability, tilting cargo bed
      - Specially designed, high durability, tilting cargo bed.
      - Wide variety of Honda Genuine Accessories.
      - Summer 2008 release. More information to come soon!
      Board Message - UTV Forum - Online UTV Community and UTV Forum
×
×
  • Create New...