Deceleration popping 1250RT

General discussion of the BMW R1200RT/R1250RT
Post Reply
Panman40
Subscriber
Posts: 494
Joined: Tue Mar 22, 2022 8:46 pm
Has liked: 483 times
Been liked: 80 times
Great Britain

Deceleration popping 1250RT

Post by Panman40 »

I’ve noticed since I’ve had my 1250rt since April this year I’m getting a rapid series of pops from the exhaust on deceleration at 2000rpm, this happens every single time no matter which riding mode it’s in.
Just wondered if anyone else has this “feature” ….?.
User avatar
Stu
Administrator
Posts: 1593
Joined: Wed Jun 02, 2021 9:13 pm
Location: Hull, UK
Bike Model and Year: 2016 R1200RT
Has liked: 556 times
Been liked: 514 times
Great Britain

Re: Deceleration popping 1250RT

Post by Stu »

Normally this is caused by a secondary air valve that puts air in to the exhaust to ignite the unburnt fuel

I don't think the RT's have one though

Another cause of it is a leak in the exhaust

Its nothing to worry about it is just unburnt fuel igniting in the exhaust and pretty common on the majority of bikes
User avatar
Doctor T
Posts: 1996
Joined: Tue Dec 21, 2021 10:21 pm
Location: west sussex
Bike Model and Year: 2007 R1200RT SE
Has liked: 1144 times
Been liked: 306 times
Great Britain

Re: Deceleration popping 1250RT

Post by Doctor T »

Have to agree popping on deceleration is mostly down to unburn fuel. Are you fully letting the throttle close? Easy to have it slightly on with thick gloves on. Saying that these bikes run lean due to the euro emissions. My 2007,1200 pops on hard deceleration and across sites ive seen the same topic raised a few times. Seems the norm
Trust me I am a retired Doctor and lecturer at Oxford University of Structural and Mechanical/Electrical engineering.
"Blessed are the cracked, for they shall let in the light". Groucho Marx
Panman40
Subscriber
Posts: 494
Joined: Tue Mar 22, 2022 8:46 pm
Has liked: 483 times
Been liked: 80 times
Great Britain

Re: Deceleration popping 1250RT

Post by Panman40 »

Thanks for the reply’s,
It does feel like over fuelling as at the same time there’s a very slight surge in power \ throttle. It only happens at 2k rpm though, deceleration from high revs is like killing the ignition !.

It’s a small thing unlike the motor being killed on steep inclines which also correspond with a sharp bend… that’s another story …
Post Reply