Join Date: Jul 2004
Location: Plungerville, Michigan
Thanked 205 Times in 187 Posts
09-10 Mileage: 1000
08-09 Mileage: 1000
07-08 Mileage: 1000
06-07 Mileage: 1000
11. Specificly on Battery EFI sleds here is another thing to check. There can be a bad relay on the back of the ecu. There are 2 of them back there 1 for the spark and 1 for the fuel pump.
12. Also, bad reeds on a sled will cause it to back fire and run poorly acting like it is an electrical issue.
14.Other issues that I have seen/read that have caused a no spark/bad running issue:
A. Wrong flywheel on it.
B. Frayed wires in the wiring harness or under the seat caused a short
C. Sled was only running on one cylinder. Low side coil on his stator read 360 ohms and it should have measured 450 ohms. The low side coil was bad.
D. It kept fouling plugs left and right. The guy before me ran ethanol, and never told me. This was on an EFI sled.
E. Hood harness was routed between rewind/stator housing and frame and had 4 wires smashed. Repaired wires and ran good.
F. Got it running again tapped the ECU and died. Pulled the ECU cover off and found some corrosion
G. Wires running to the carbs were rubbing against the jack shaft (Shaft going from secondary clutch to the top sprocket in the chain case). After rewrapping/rerouting the wires it ran great
H. Bolt for the recoil cup broke off and hit the trigger coil, bent the bracket slightly and gave it too much air gap
I. Oil Injection turned up too high
J. Fuel Lines hooked up backwards
K. Lean jetting will cause a bog. The sled would start and idle but if you pinned the throttle the sled would bog and quit running. We were able to determine that it ran better when you choked it a little. We jetted up and it ran good.
L. Sheared Timing key
M. Crank out of Phase will cause it to run very poorly.
N. Too much dielectric grease in the trigger connector caused sled to bog.
O. Bad TPS Switch/TPS wires shorting/grounded
P. The wire on the carburetor was put on backwards
Q. Loose key switch wire