2005 MCI 'spitting' after lift kit even with rebuilt engine

[nickdalzell1]

I'm only guessing this is MCI related since these versions of the Robin never run right on a lifted golf car. they run, but they 'spit and spat' like tiny backfires when you start them. they run fine after however.

Customer has one he put a lift kit on--car goes around 25 mph (bypassed governor) and it originally came in only running on one cylinder--the other rod had broken and that piston wouldn't move.

We have installed three different rebuilt MCI engines and they run, but they spit and spat on start/restart enough to annoy the customer who's paranoid. We tried different and even OEM carbs too, to eliminate the issue, same result. Same with ignition coils. The Ignitor is a $1000 part and customer won't pay that to 'guess' whether or not it fixes it.

I am blaming the lift kit and bypassed governor on the issue, and the MCI doesn't seem to like running on a lift kit for some reason--changing the RPM/ratio in some way?

He refuses to ditch the lift or pay to convert to non-MCI which IMO was the better of the two series of the twin cylinder. The MCI was such hot garbage with soft heads that the valves wear into, and hideously expensive ignition parts that EZGO even scrapped the entire thing and went to the thumper, or my nickname for the 13HP Kawasaki engine they use today.

I'm not a psychologist--I can't fix paranoia. I'm not sure what to do. Right now we have the third engine out, and waiting for a fourth. Not expecting any change. The governor is back to stock speed but it still spits and spats on start. It does NOT backfire like a gunshot, just goes 'sp! sp!' on a hot start and runs after.