Running on one (sometimes)
Posted: Sat Oct 01, 2016 3:10 pm
Hi I am not at a loss as to what to do next with my 906 in terms of getting her to run OK. I have got her to run beautifully in the garage for anything between 2 and 20 minutes. Then all of a sudden she will only fire on one cylinder. (Horizontal). Pops and bangs through the exhaust when this happens. I have assumed this was to do with the Weber fuel height and pressure. Bike was previously laid up in dry storage for 10 years- no idea why (maybe this!) Replacement electric pump was previously fitted but no pipe work. New fuel lines and a new filter added by me.
Pump,is a facet low psi version (1-4 psi off the top of my head) whilst convincing myself I had a flooding issue I also fitted a Holley pressure regulator(1-4psi range). This is set right at the bottom of the range.
The carb was ultrasonic ally cleaned and a refurb gasket set used ( this included a new valve and seat for the fuel chamber part.
Sometimes it will only start on one cylinder sometimes 2, other times it will fire up on two then fall back to one which could happen in 30 seconds or 5 minutes.
I swapped over the coils in desperation but no change. Connections to it all clean and tight. Three way connector to it opened up, male side cleaned up and female side nipped up slightly to ensure good connection. The AMP connection was also a opened- some evidence the female side had been distorted a bit but still connecting to male blade side OK. ( have ordered a replacement just so I can be 100%). Connector block to ignition unit pulled off and reinserted- all seems fine.
I'm now at a loss as to what to check.
All I can think of is change filter as it may have become clogged up from debris in side tank ( inside actually quite shiny). Clean the carb -3rd time!!
Can anyone please suggest some ideas! I'm getting frustrated as when she does run she sounds great.
Best regards
Keith MM in SE London
Pump,is a facet low psi version (1-4 psi off the top of my head) whilst convincing myself I had a flooding issue I also fitted a Holley pressure regulator(1-4psi range). This is set right at the bottom of the range.
The carb was ultrasonic ally cleaned and a refurb gasket set used ( this included a new valve and seat for the fuel chamber part.
Sometimes it will only start on one cylinder sometimes 2, other times it will fire up on two then fall back to one which could happen in 30 seconds or 5 minutes.
I swapped over the coils in desperation but no change. Connections to it all clean and tight. Three way connector to it opened up, male side cleaned up and female side nipped up slightly to ensure good connection. The AMP connection was also a opened- some evidence the female side had been distorted a bit but still connecting to male blade side OK. ( have ordered a replacement just so I can be 100%). Connector block to ignition unit pulled off and reinserted- all seems fine.
I'm now at a loss as to what to check.
All I can think of is change filter as it may have become clogged up from debris in side tank ( inside actually quite shiny). Clean the carb -3rd time!!
Can anyone please suggest some ideas! I'm getting frustrated as when she does run she sounds great.
Best regards
Keith MM in SE London