81 Honda CM 400 T discussion forum: problems:80 Honda CM 400 T/Slow fuel flow/Ignition Mis-Fire
problems:80 Honda CM 400 T/Slow fuel flow/Ignition Mis-Fire
Shadetree Mech. said 2007-08-19 20:23:33
I am new to this on line info stuff ! I have two problems with my 1980 Honda CM 400 T, and I need a good advice and/or discussion group. PROBLEM: Short version: *****1) Slow flow of fuel to the Carb. Bowls (seems like a vapor lock). If I force feed by squeezing the the tube from tank to Carb.,engine will run. I replaced tubing with clear vinyl tubing so I could watch what is happening with the gas flow (great tip for trouble-shooting). Open bowl bleed screws, fuel flows freely into Carb. Also let bike sit for 30 Mins., fuel will fill the bowls, but it is a slow trickle into Carb. NOTE: Accelerator pump diaphragm OK , no cracks & it is soft and flexible, (amazing for 43,000 miles). *****2) Very bad mis-fire under fast acceleration. Idles well and runs OK under slow acceleration until RPM reaches 4,500, then total break-down of ignition firing.(Mis-Fire does show up with Timing light hooked up to either plug wire) Hope it is not the C.D.I. unit (black box). NOTE: Stator has been re-wound & Coil has been bench checked. ----HOPE YOU CAN CONNECT ME WITH THE RIGHT TECH HELP. -------------Thanks, Shadetree Mech.
We invite you to introduce yourself by a few sentences if you are new to
this discussion group. Enter your e-mail to join the forum and get notifcations of new messages. Or post your question,
answer or comment as a guest. We have just improved this discussion forum and expect the number of users to increase.
More 1981 Honda CM 400 T information
Our discussion groups are intended for short messages. We also welcome more extensive motorcycle reviews.
Bikez also recommends that you check out the technical
data and the riders' rating for the 81 Honda CM 400 T.
You can also rate it yourself. Use our efficient motorcycle
classifieds to sell or
this bike. Your motorbike gets a high quality presentation. Ads are free.