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Title: carburetted M900 rough running '96. Post by: CX500 on June 25, 2009, 05:10:01 PM Hoping someone might recognize this symptom:
Rough running, sputtering, and coughing at steady throttle. Give the throttle a twist and it runs great -- lifts the front wheel. Idle is OK, maybe a little rough. Sounds like a carb issue to me - maybe a plugged jet before the needle jets take over, but it also smells very rich after running rough. This made me wonder about electrical. I am going to change plugs tomorrow. Try to check one thing at a time. Any insight would be greatly appreciated. MarcuSS Title: Re: carburetted M900 rough running '96. Post by: ducpainter on June 25, 2009, 05:17:59 PM Hoping someone might recognize this symptom: Replace the needle jets/emulsion tubes.Rough running, sputtering, and coughing at steady throttle. Give the throttle a twist and it runs great -- lifts the front wheel. Idle is OK, maybe a little rough. Sounds like a carb issue to me - maybe a plugged jet before the needle jets take over, but it also smells very rich after running rough. This made me wonder about electrical. I am going to change plugs tomorrow. Try to check one thing at a time. Any insight would be greatly appreciated. MarcuSS I have the same bike. Title: Re: carburetted M900 rough running '96. Post by: beethoven on June 26, 2009, 01:44:48 AM +1 Needle jets. They get worn and let fuel through at low-mid revs causing roughness and richness. I have 97 M900 and have just done them at 45000 km. Fuel consumption has improved about 15%. The mechanic photographed the tube and it had a definite oval shape rather than circular.
Title: Re: carburetted M900 rough running '96. Post by: CX500 on June 26, 2009, 08:23:45 AM Thanks for the replies. This is exactly what I was thinking, especially at 35,000 miles.
Now, do I do some work on these carbs, or go for the flat-slides I always wanted. Hmmmm... MarcuSS Title: Re: carburetted M900 rough running '96. Post by: ducpainter on June 26, 2009, 02:21:47 PM Thanks for the replies. This is exactly what I was thinking, especially at 35,000 miles. needle jets will set you back about $100...Now, do I do some work on these carbs, or go for the flat-slides I always wanted. Hmmmm... MarcuSS Flatslides will be considerably more. How flush are you? ;D |