How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Louie Your Own Question
Louie, Technician
Category: Motorcycle
Satisfied Customers: 12571
Experience:  25+ yrs. experience
Type Your Motorcycle Question Here...
Louie is online now
A new question is answered every 9 seconds

My M900 turns over fine. Has new fuel lines new fuel new

Customer Question

My M900 turns over fine. Has new fuel lines new fuel new battery. Will crank over and over but wont start Whats next
JA: When did you last fill the tank? And do you smell gasoline around the engine?
Customer: A week ago i fueled the tank. Drained all the existing fuel out..
JA: What is the model/year of your motorcycle?
Customer: R900 1998 i think
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Ive put new plugs in obviously changed the fuel and battery. Had all the fuel lines changed by a mechanic a few months back.. One thing i did do out of the ordinary before i bought a new battery was charge the old battery with jumper leads from the car. Could of this damaged anything ?? It wouldnt fire when i did that either. Seem to have a masive backfire after trying to start and the key is turned off then on ??
JA: Anything else you think the mechanic should know?
Customer: No
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.

Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.

Initially, attempt to start again with the clutch lever pulled in and the side stand folded up.

Still, let's try and review the basics. Proposed preliminary checks (if have not been done) on suspects:

  • • carefully remove the spark plugs immediately after attempting a start;
  • • determine if these are wet with fuel;
  • • cautiously perform a spark test.

All others would require the use of a volt/multi-meter.

Customer: replied 1 year ago.
Loui that made no difference. Any other ideas. The backfire from the exhaust is like a gun going off. This happens when the ignition is turned off and then on.
Expert:  Louie replied 1 year ago.

Is there spark at the plugs when attempting to start?

Customer: replied 1 year ago.
No spark at plugs.
Expert:  Louie replied 1 year ago.

This would explain the backfire; no spark when attempting to start BUT there is a single spark when turning on; i.e. ignition system is not functioning.

Let's try work on the easy to reach suspects first / back to the side stand switch; locate this switch and for test purposes, ground the gray wire to the engine. Attempt to start / check for spark.

If still not corrective, then a volt/multi-meter would be needed for all other tests.