Curvy rear cylinder cuts out. - Page 2 - SV650.org

25-07-12, 02:38 PM

I am based in bolton lancashire.
I split the carbs up. I have a spare set and I chose the best rear carb, the one with the least worn needle jet. It also has a DynoJet kit fitted so I had to reuse the needle, I will re-check this for any marks at weekend.

jambo · 25-07-12, 04:01 PM

Simplify the approach.

You have a specific problem, try to find out what's up. Do you know someone else with an SV in Lancashire?

Don't mess about separating carbs, just shunt the whole lot in, then you can break down each section when you know that that assembly made a difference. When a friend had a similar problem we'd substitute whole systems across until we found it.

Carbs
Both Coils & HT leads
ICU

etc, turned out in his case the loom itself was at fault. We never could find a problem with it when cold, but we dropped one from another bike on and the problem went away.

Jambo

26-07-12, 04:28 PM

I have split the loom to check for breaks but not found any, I am going to check the ICU connectors this weekend. The coil connections are ok,
the feed wire is ok, the ICU conns are the only ones left to check.
need small screw driver to remove them from the connector block.

31-07-12, 03:10 PM

Ignition OK, looks like the rear carb is dumping fuel into the cylinder.
Discovered fuel dripping from exhaust connector when bike ticking over.

(Welded connector must be cracked internally)

maviczap · 31-07-12, 05:10 PM

read this thread, similar problem to yours

http://forums.sv650.org/showthread.php?t=181591

01-08-12, 12:44 PM

Thanks Maviczap will check the fuel pump gasket.

01-08-12, 04:06 PM

My rear cyclinder was half firing, noticalble when riding, got worse when you stopped/slowed down. Turns out the rear carbs was leaking round the bowl... Not as obvious as you think because the heat makes it evaporate quickly. Just something to check.

02-08-12, 10:42 AM

Checked the fuel pump. got a mouth full of petrol. diaphragm leaking, allowing fuel into
the rear inlet tract problem solved at last.

25-07-12, 02:38 PM	#11
Draconis Guest Posts: n/a	Re: Curvy rear cylinder cuts out. I am based in bolton lancashire. I split the carbs up. I have a spare set and I chose the best rear carb, the one with the least worn needle jet. It also has a DynoJet kit fitted so I had to reuse the needle, I will re-check this for any marks at weekend.

25-07-12, 04:01 PM	#12
jambo Member Mega Poster Join Date: Aug 2003 Location: Croydonia Posts: 5,376	Re: Curvy rear cylinder cuts out. Simplify the approach. You have a specific problem, try to find out what's up. Do you know someone else with an SV in Lancashire? Don't mess about separating carbs, just shunt the whole lot in, then you can break down each section when you know that that assembly made a difference. When a friend had a similar problem we'd substitute whole systems across until we found it. Carbs Both Coils & HT leads ICU etc, turned out in his case the loom itself was at fault. We never could find a problem with it when cold, but we dropped one from another bike on and the problem went away. Jambo __________________ Modern motorcycles are bloody brilliant, enjoy it while we can Last edited by jambo; 25-07-12 at 04:03 PM.

26-07-12, 04:28 PM	#13
Draconis Guest Posts: n/a	Re: Curvy rear cylinder cuts out. I have split the loom to check for breaks but not found any, I am going to check the ICU connectors this weekend. The coil connections are ok, the feed wire is ok, the ICU conns are the only ones left to check. need small screw driver to remove them from the connector block.

31-07-12, 03:10 PM	#14
Draconis Guest Posts: n/a	Re: Curvy rear cylinder cuts out. Ignition OK, looks like the rear carb is dumping fuel into the cylinder. Discovered fuel dripping from exhaust connector when bike ticking over. (Welded connector must be cracked internally)

31-07-12, 05:10 PM	#15
maviczap Member Mega Poster Join Date: Mar 2007 Posts: 9,097	Re: Curvy rear cylinder cuts out. read this thread, similar problem to yours http://forums.sv650.org/showthread.php?t=181591 __________________ We're riding out tonight to case the promised land Make everyday count RIP Reeder - Jolly Green Giant and comedy genius

01-08-12, 12:44 PM	#16
Draconis Guest Posts: n/a	Re: Curvy rear cylinder cuts out. Thanks Maviczap will check the fuel pump gasket.

01-08-12, 04:06 PM	#17
Destruktor77 Guest Posts: n/a	Re: Curvy rear cylinder cuts out. My rear cyclinder was half firing, noticalble when riding, got worse when you stopped/slowed down. Turns out the rear carbs was leaking round the bowl... Not as obvious as you think because the heat makes it evaporate quickly. Just something to check.

02-08-12, 10:42 AM	#18
Draconis Guest Posts: n/a	Re: Curvy rear cylinder cuts out. Checked the fuel pump. got a mouth full of petrol. diaphragm leaking, allowing fuel into the rear inlet tract problem solved at last.

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