R1200S misfire/lumpy at low revs

[Copper]

Hi,

Finally got my bike back together and MOT'd after about 7 months off the road.

Only one problem now, its really lumpy at low revs, it fine at higher engine speeds but I'm having to rev it and slip the clutch a lot to pull away.

What/where should I check first?

Thanks,

Jon

[Herb]

Simple stuff first, especially after its been off the road a while.

Plugs
Fresh fuel? Throw a tank of premium in there.
Nothing nesting in the air filter housing?

After that, stick coils maybe? They have been known to play up.

[milleplod]

I'd hazard a guess at a stick coil having gone. Easy to check - while the engine's ticking over, disconnect the low-tension lead from each coil in turn and see if there's any difference in the engine sound. I parked my ST up one November, it had been running fine - dug it out the following March, symptoms just like yours.

I always carry a spare main, and one of each of the secondaries now.

Pete

[Copper]

Hi,

Thanks,

I had a stick coil go before it only effected high speed running. This does seem similar just at the lower rev range. Can a faulty coil affect the running at any speed?

Regards,

Jon

[milleplod]

On mine, it was definitely more noticeable at lower revs - slipping the clutch was the only way I could set off without the bike feeling like it was going to stall. I could also feel it at higher revs, the bike just didn't feel as if it had as much 'go' as it should have done.

Definitely worth checking.

Pete

[Humbug]

Same with mine, certainly noticeable at low revs.

[dave the german]

Mine felt like that after I'd rode my GS for some time then I was reminded about the R1200s throttle and the need to give it a handful when setting off but it did feel a little odd. Throttle bodies were balanced and tappets done. Next up is a re map

[The Teutonic Tangerine]

Are the bungs still on the stubs that you attach the tubes for a vacuum meter to? Maybe bleeding air in to one or other throttle body?