Bike Running On One Cylinder Shortly After Starting? - SV650.org

Steve_God · 02-07-09, 10:52 AM

Hey peeps,

I've got a question that I 'think' I know the answer to, but wanted to get some further opinions on:

Occasionally when I start the bike up, it makes a noise for a few seconds that sounds like it's running with no exhaust. Very loud and lumpy noise. But then afterwards it's fine.

I'm 'assuming' that it's just the engine mis-firing, as the spark-plugs are well over-due to be changed. But wanted to see if you all think the same? Or if it could be something a bit more sinister?

02-07-09, 10:54 AM

Does it only happen when the bike's cold, or when it's hot too?

If only cold, then you're right and it could be a plug getting up to temp

Steve_God · 02-07-09, 11:07 AM

It's only happened recently when the engine is already warm, either due to the warm temperature outside (with the engine temp showing 30 degrees) or not long after the bike has been running (with the engine temp showing around 70/80).

Steve_God · 04-07-09, 05:12 PM

Any thoughts anyone?

dizzyblonde · 04-07-09, 07:28 PM

Evaporating petrol?
Different circumstances, but, recently a right propper head scratcher was solved on one of my bikes. It would only ever ever ever start on one cylinder, sounded like it was thuping itself to death. What was thought to be oil leaking from somewhere(but no evidence) was actually petrol leaking out of the float bowl. There must have been some grit under the rubber gasket inside, so it didn't seal properly. Overnight the petrol would evaporate or leak out of the seal, so there was no petrol in it to fire up both cylinders. YC swapped the bowl and gasket...bish bash bosh TWO cylinders

Might be worth poking about in the petrol dept. Different to carbs, so dunno how it works, but maybe theres a seal gone somewhere.

yorkie_chris · 04-07-09, 07:31 PM

Maybe vapor lock in injector pipes. Try change the plugs, see if it helps and see what tey look like.

Steve_God · 10-07-09, 01:23 AM

Quote:

Originally Posted by yorkie_chris

Maybe vapor lock in injector pipes. Try change the plugs, see if it helps and see what tey look like.

It did it again this morning...
I'll change the plugs since I've got some lying around, and see what happens!
(May be some time before I get around to doing that though

)

10-07-09, 04:08 AM

I recon dampness in front spark plug 'ole.

WD40 / dry / silicon grease seal

02-07-09, 10:52 AM	#1
Steve_God Member Mega Poster Join Date: Apr 2006 Location: Mow Cop, Cheshire Posts: 1,214	Bike Running On One Cylinder Shortly After Starting? Hey peeps, I've got a question that I 'think' I know the answer to, but wanted to get some further opinions on: Occasionally when I start the bike up, it makes a noise for a few seconds that sounds like it's running with no exhaust. Very loud and lumpy noise. But then afterwards it's fine. I'm 'assuming' that it's just the engine mis-firing, as the spark-plugs are well over-due to be changed. But wanted to see if you all think the same? Or if it could be something a bit more sinister? __________________ SV650s; K6; Metallic Euclase Silver; Fully Faired; Renegade Twin Exhaust Full System (Stubbied); Full ECU Remap; Fabri Tinted DB Screen; Hamicad Fender Eliminater; Bagster Seat/Suzuki Gel Seat; Fenda Extenda; HEL Braided Brake Hoses; R&G Crash Bungs; GSXR Front-end, Triumph Daytona 675 Front Brake Master Cylinder; RedFox Rear Hugger; BMC F.1 Air Filter; Top Box! *Coastal Tours*:Great Britain (for Cancer Research) - 3588.2 miles: Completed July 2007. Ireland - 1466 miles: Completed for July 2008

02-07-09, 10:54 AM	#2
simesb Guest Posts: n/a	Re: Bike Running On One Cyclinder Shortly After Starting? Does it only happen when the bike's cold, or when it's hot too? If only cold, then you're right and it could be a plug getting up to temp

02-07-09, 11:07 AM	#3
Steve_God Member Mega Poster Join Date: Apr 2006 Location: Mow Cop, Cheshire Posts: 1,214	Re: Bike Running On One Cyclinder Shortly After Starting? It's only happened recently when the engine is already warm, either due to the warm temperature outside (with the engine temp showing 30 degrees) or not long after the bike has been running (with the engine temp showing around 70/80). __________________ SV650s; K6; Metallic Euclase Silver; Fully Faired; Renegade Twin Exhaust Full System (Stubbied); Full ECU Remap; Fabri Tinted DB Screen; Hamicad Fender Eliminater; Bagster Seat/Suzuki Gel Seat; Fenda Extenda; HEL Braided Brake Hoses; R&G Crash Bungs; GSXR Front-end, Triumph Daytona 675 Front Brake Master Cylinder; RedFox Rear Hugger; BMC F.1 Air Filter; Top Box! *Coastal Tours*:Great Britain (for Cancer Research) - 3588.2 miles: Completed July 2007. Ireland - 1466 miles: Completed for July 2008

04-07-09, 05:12 PM	#4
Steve_God Member Mega Poster Join Date: Apr 2006 Location: Mow Cop, Cheshire Posts: 1,214	Re: Bike Running On One Cyclinder Shortly After Starting? Any thoughts anyone? __________________ SV650s; K6; Metallic Euclase Silver; Fully Faired; Renegade Twin Exhaust Full System (Stubbied); Full ECU Remap; Fabri Tinted DB Screen; Hamicad Fender Eliminater; Bagster Seat/Suzuki Gel Seat; Fenda Extenda; HEL Braided Brake Hoses; R&G Crash Bungs; GSXR Front-end, Triumph Daytona 675 Front Brake Master Cylinder; RedFox Rear Hugger; BMC F.1 Air Filter; Top Box! *Coastal Tours*:Great Britain (for Cancer Research) - 3588.2 miles: Completed July 2007. Ireland - 1466 miles: Completed for July 2008

04-07-09, 07:28 PM	#5
dizzyblonde Da Cake Boss Mega Poster Join Date: May 2007 Location: On a flying Horse Posts: 9,992	Re: Bike Running On One Cyclinder Shortly After Starting? Evaporating petrol? Different circumstances, but, recently a right propper head scratcher was solved on one of my bikes. It would only ever ever ever start on one cylinder, sounded like it was thuping itself to death. What was thought to be oil leaking from somewhere(but no evidence) was actually petrol leaking out of the float bowl. There must have been some grit under the rubber gasket inside, so it didn't seal properly. Overnight the petrol would evaporate or leak out of the seal, so there was no petrol in it to fire up both cylinders. YC swapped the bowl and gasket...bish bash bosh TWO cylinders Might be worth poking about in the petrol dept. Different to carbs, so dunno how it works, but maybe theres a seal gone somewhere. __________________ Suzy, yellow 2001 SVS. Kitty, V-Raptor 1000, ZZR1400<<its my bike now Pegasus! Hovis 13.8.75-3.10.09 Reeder 20.7.88-21.3.12

04-07-09, 07:31 PM	#6
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Bike Running On One Cyclinder Shortly After Starting? Maybe vapor lock in injector pipes. Try change the plugs, see if it helps and see what tey look like. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

10-07-09, 04:08 AM	#8
injury_ian Guest Posts: n/a	Re: Bike Running On One Cyclinder Shortly After Starting? I recon dampness in front spark plug 'ole. WD40 / dry / silicon grease seal

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
K6 running on one cylinder.	Smoggy	SV Talk, Tuning & Tweaking	29	16-03-09 11:03 PM
Too much oil on the K&N, now running on 1 cylinder...	Troy	Bikes - Talk & Issues	26	24-07-08 06:21 AM
RUNNING ON 1 CYLINDER	jmsvuk	SV Talk, Tuning & Tweaking	2	13-02-06 04:53 PM
Help - running on 1 cylinder	buckstone	SV Talk, Tuning & Tweaking	3	23-01-06 05:55 PM
1 cylinder running	Scoobs	SV Talk, Tuning & Tweaking	6	11-02-05 10:05 PM