Guys my last bike was a softail with the 88 cu. in. motor and 5 speed tranny. It ran great and had 58K on it when I traded it in. My new to me Ultra has 18K on it and I notoced when I am slowing down to stop or turn etc. that I feel a slight slip when the rpm's get lower. On my old bike I could let the engine do braking and it never did this. It's almost like the engine is braking through compression and all of the sudden it just stops and the bike slips or lurches forward slightly. Any ideas?? Do I need to look into the clutch or something? Thanks for the help! Oh and I dont notice any slipping on acceleration....just deceleration.

 

Sound like engine breaking, what is the compression at? Is it a stock motor with flat tops? I have a BB 103 but it only slips on gravel or wet area, blip throttle on down shift should get rid of it locking up..

 

It's a stock 88CI with EFI. Not sure what a flat top is. My last bike had a 95" kit with cams and some head work. So is what I am noticing normal? Any cause for concern?

 

I think I have experienced this and what I finally realized is that when you first shut off the throttle the ECM signals the system to shut off the fuel to the point the engine quits running. When you finally reach a certain rpm (don't ask me what rpm) it starts adding fuel again so the engine is running again. It almost feels like a jake brake on a truck.

 

My 07 did that several times. Just figured it was the nature of the beast and never worried about it.

SugsPa

 

My RK does that when I decelerate to slower than the gear, if that makes any sense. It lurches forward from what seems like piston momentum, then flattens out after 1/2 a cycle. I've only noticed it in 2nd coming to a stop though.

 

Flat Tops are the lowest compression ratio piston, as apposed to high compression piston.

It also, maybe a clogged breather bolt/ tube..

 

I had a 06 ultra and it did exactly what you are saying. I think it is the compensator but I am not sure I quit worring about it It did it from day one until I sold It in late 2012 with 115000 on it.

 

OP>>>>I have noticed the same thing, and feel the same way as this guy...so I would say it is a normal thing...

 

Its the cluth. Its a reverse slipping clutch. Some of you guys that have only rode Harleys arent used to it because its something that Harley has just recently put on their bikes. Its been on metrics and crotch rockets for years. Nothing to do with compression or anything like that. Its designed to make downshifts a lot smoother and only allows engine braking down to that point to right before the engine stalls out when rolling. Nothing to worry about...just takes some getting used to...especially for all of you that haven't ridden anything remotely modern.