Join Date: Nov 2018
Location: Ontario, Canada
2010 500HO Hesitation on acceleration
I have a 2010 500HO that seems to hesitate or miss on acceleration under load. I took my son to the gas station and while we were headed there, during acceleration from a stop, it would miss. I should mention too, it has a miss at idle but no discernible miss when in punching the throttle in park. The idle miss is confirmable using a timing light. It is absolutely possible this miss is also occurring under load and noticeable in park, off idle. The carb has been off half a dozen times, super clean, blown out all the jets (new carb kit), ran seafoam through it etc. I'm at a bit of a loss here. I am going to see tonight if the fuel pump is pumping as it should. It does mange 55 MPH but, misses as you are holding WOT. I can ease into the throttle up to 25MPH without noticing it but after 1/4 throttle it starts to become noticeable. The rpm gauge is inaccurate without the lights on if that matters? Anyone experienced this? I'm stumped and don't want to just throw money at it. The ignition should fire every time regardless the situation in the combustion chamber, right?
Cam is good
Valves are clearanced
No gas in oil
Carb clean tested the intake boots on both sides of the carb
Things i have considered (but don't want to throw money at yet, i'm done doing that):
Pickup coil? - doesn't pickup up every time?
Ignition coil? I did get it to jump a "10,000V" Gap with a spark tester
CDI? But why? lol
Last edited by Willshire; 08-12-2019 at 07:49 AM.