Slight surging problem - SV650.org

19-12-08, 02:44 PM

The sv seems to be surging a bit lately. Its more noticeable in the lower revs when going slow in and around the city. Chain and sprocket are relatively new and in good nick. Tyre pressure is fine. Rear wheel is aligned using swingarm to axle method. Clutch seems ok. What else could cause this feeling? Definitely engine-ish as if i freewheel its not present..

yorkie_chris · 19-12-08, 02:48 PM

Balance the carbs up. Is it due a valve clearance check?

19-12-08, 02:50 PM

Quote:

Originally Posted by yorkie_chris

Balance the carbs up. Is it due a valve clearance check?

Sorry, forgot to mention both balance and clearances done about 2 months ago.

19-12-08, 03:32 PM

Done some reading and it looks like my bike may be running lean ie. lean surge? Is there a relatively easy way to solve this, or is it a trip to the garage even though i just got my carbs balanced and clearances checked? Don't have any experience with carbs or shims and whatnot...

19-12-08, 03:36 PM

I thought they do surge anyway?
mine seems to a bit at low revs and low speed when not under much load.

Steve

19-12-08, 03:49 PM

Quote:

Originally Posted by startrek.steve

I thought they do surge anyway?
mine seems to a bit at low revs and low speed when not under much load.

Steve

Ya, from what ive been reading they do come out of the factory running lean and some do tend to be lumpy. Funny thing is mine didnt do it before the work and only seemed to start a while after, not immediately.

Mines restricted also, if that makes any difference.
And has a baffless Beowulf slip on too...

yorkie_chris · 19-12-08, 03:51 PM

Check everything's attatched properly.

19-12-08, 03:52 PM

Sounds more like a stuck choke to me.

The front choke plunger is susceptible to water ingress. I would guess the plunger and spring is rusted up and sticking in the open position.

19-12-08, 04:55 PM

Quote:

Originally Posted by BigApe

Sounds more like a stuck choke to me.

The front choke plunger is susceptible to water ingress. I would guess the plunger and spring is rusted up and sticking in the open position.

Would this not cause the engine to idle a bit higher than before the surging appeared?

19-12-08, 04:58 PM

If the choke was stuck open on one of the cables, you'd have a rough idle , where the needle would move around from 1000 to say 2000 or above depending.

p.s. are you doing the toy run on sunday ?

19-12-08, 02:44 PM	#1
noob-saibot Guest Posts: n/a	Slight surging problem The sv seems to be surging a bit lately. Its more noticeable in the lower revs when going slow in and around the city. Chain and sprocket are relatively new and in good nick. Tyre pressure is fine. Rear wheel is aligned using swingarm to axle method. Clutch seems ok. What else could cause this feeling? Definitely engine-ish as if i freewheel its not present..

19-12-08, 02:48 PM	#2
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Slight surging problem Balance the carbs up. Is it due a valve clearance check? __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

19-12-08, 03:32 PM	#4
noob-saibot Guest Posts: n/a	Re: Slight surging problem Done some reading and it looks like my bike may be running lean ie. lean surge? Is there a relatively easy way to solve this, or is it a trip to the garage even though i just got my carbs balanced and clearances checked? Don't have any experience with carbs or shims and whatnot...

19-12-08, 03:36 PM	#5
startrek.steve Guest Posts: n/a	Re: Slight surging problem I thought they do surge anyway? mine seems to a bit at low revs and low speed when not under much load. Steve

19-12-08, 03:51 PM	#7
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Slight surging problem Check everything's attatched properly. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

19-12-08, 03:52 PM	#8
Stig Guest Posts: n/a	Re: Slight surging problem Sounds more like a stuck choke to me. The front choke plunger is susceptible to water ingress. I would guess the plunger and spring is rusted up and sticking in the open position.

19-12-08, 04:58 PM	#10
drag Guest Posts: n/a	Re: Slight surging problem If the choke was stuck open on one of the cables, you'd have a rough idle , where the needle would move around from 1000 to say 2000 or above depending. p.s. are you doing the toy run on sunday ?

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