IT RUNS!!! So I haven't really had any time or motivation with the 400 lately but we were slow at work today so I reassembled the magneto side since everything looked and tested good. 3rd pull and it was running again. Was back to its coughing and popping. Anyway....long story short...switched the p...

Seals are good. Going to go find the parts sled in the back of the shed this weekend...swap the cdi first and go from there.

The more I think about it the less I think its fuel/carb problem. Just seems ignition to me. I tried pinching off the fuel feed line, wouldn't it lean out for a few seconds before it runs out of fuel and run good enough and get enough rpm to start engaging the clutch? When it runs it will sit there ...

Did a cold engine compression check here, wide open throttle and a good pull from the rope gets both cylinders in the 130-135 psi area. I think I am going to get a new carb kit, 07-410, and give the carb a good bath. May as well put some crank seals in, will have to read up on that in the manual. Ha...

OK, I understand the theory of this system. I ohmed the triggers and the high and low speed coil. here is what I got #1 and #2 triggers: 31ohms low speed coil: 2.6k ohms high speed coil: 83 ohms With the high speed being 6 ohms out of spec will that cause this problem? Have not pulled the flywheel o...

Is it possible the windings could be bad but still ohm good? If the high speed windings were bad wouldn't it idle ok? I did eyeball the needle/float adjustment and moved it down a hair with no change. Yea I am a auto mechanic during my day job and get people that call and think I can pinpoint there ...

Year & Serial #: 1976 J400E-056203M
Build Date (if available) 6-75
Original/Restored: Original
Your name (at least first name): Brian
Location (at least state/country): South Dakota
Owned since: 4/6/12
Original Dealer: ?
History/Number if Raced: ?
Special Comments: N/A

Recently bought a 76 400. Didn't run when I bought it, no spark at either plug. Put a new CDI box and have good spark now. Now here is my problem. It fires up, sometimes needing the throttle squeezed to start, but runs very poorly. Will not get enough rpms to engage clutch and move machine even with...