SV1000 exhaust temp different

**Motu** · 28th April 2006, 12:38

Some V Twins have different cam and ignition timing for the rear cyl,this could give different exhaust temps at idle.

**cowpoos** · 28th April 2006, 12:43

Originally Posted by Motu

Some V Twins have different cam and ignition timing for the rear cyl,this could give different exhaust temps at idle.

yep....and with the exhuast system on the vairing sides...the right one in a lot longer....and did the same on my TLs....the back fires and pops are nothing major to worrie about...its quite common with aftermarket cans to upset the fueling a lil...my TL used to blow blue flames out the exhausts when coming of the throttle at high revs...quite spetacualr at nite I was told!!

**paturoa** · 29th April 2006, 11:58

Just pulled apart and the top butterflys were closed...hmmm turned on the ignitionand they opened - remember that one.

Anyway the front throttle body had a residue around the line of the closed lower butterfly which I couldn't reach. So I got a pair of long nose pliers and a cotton bud and wiped the opposite side to the injectors. Definite black sooty reside from burnt fuel.

You can see right down to the top of the the valves on the front cylinder and the black residue was mostly around the ring of the bottom butterfly as much as I could see.

The rear is harder to see and has a bend in it so can't see the top of the valves but can just see the valve stems. Anyway the ring of black soot was identical to the front. Checked it with the cotton bud and the exact same soot was there.

Hmmm unlikely to be burn valves (besides exhaust almost always go first)

I'm off to have a coffee, stand there and look at it for a while (my thinking pose) and check the flanges next.

**paturoa** · 29th April 2006, 15:22

checked the flanges, as much as I could, had to use a little mirror and bright light. As far as I can see there are no leaks anywhere.....

Got bored with that so fitted my heated grips instead. Bit of a mission - see

http://www.kiwibiker.co.nz/forums/sh...ad.php?t=28291

Anyway back to the issue of the day

Any ideas anyone?

Put the original cans back on???

**imdying** · 29th April 2006, 16:16

I wouldn't worry about it, it's just the PAIR valves doing their job. You can always do the PAIR mod, but I'd leave it unless it really annoys you.

**paturoa** · 29th April 2006, 16:49

yours does it too?

**Scouse** · 29th April 2006, 17:02

Originally Posted by u4ea

what fuel are you using??hopefully 96 or 98 should give a better life on the pistons,91 is causing combustion ..................

Silly Girly she means Detonation

**Titanium** · 29th April 2006, 17:23

Detonation is where the burn happens prior to piston coming to Top Dead Center and full compression.

The piston meets and explosion which is BAD. Eats away at pistons, especially on exhaust side and hammers the little end bearings and wristpins. Rather than the fuel/ air mixture being compressed then ignited as it shold.

Happens real bad in 2 strokes where timing / heat / bad fuel are factors.

Peter

**paturoa** · 1st May 2006, 19:59

Just checked Spankme's SV1000 site - bloody good!

http://www.sv-portal.com

Anyway did a search and found a bunch of really useful stuff. Appears to be quite common. I need to check the plugs just to make sure not running too lean.

They need replacing anyway so I'll post what I find with the plugs when I change them.

**Pussy** · 1st May 2006, 21:04

Originally Posted by BMWK1200S

Detonation is where the burn happens prior to piston coming to Top Dead Center and full compression.

The piston meets and explosion which is BAD. Eats away at pistons, especially on exhaust side and hammers the little end bearings and wristpins. Rather than the fuel/ air mixture being compressed then ignited as it shold.

Happens real bad in 2 strokes where timing / heat / bad fuel are factors.

Peter

Nope, that's preignition, caused by a hotspot somewhere in the combustion chamber. Quite different to detonation

**paturoa** · 3rd May 2006, 22:16

Changed the plugs tonite and both good. Rear is marginally richer than the front which is a good colour.

Been checking Spankme's SV1000 site and contemplating the the TPS tune next.

**imdying** · 3rd May 2006, 22:23

Took the baffles out of my Microns tonight... the right one was about twice as sooty as the left one, which is what I was expecting.

**paturoa** · 3rd May 2006, 23:03

Originally Posted by imdying

Took the baffles out of my Microns tonight... the right one was about twice as sooty as the left one, which is what I was expecting.

Clean or check? Microns are loud enough standard.

**imdying** · 4th May 2006, 11:39

Just to see what they sounded like. To be honest, the difference is negligible. I was expecting something obnoxiously loud, but there's hardly any difference. Bearing that in mind, they look better with them out, so out they're going to stay (subject to a few days running around town to be sure they're not much, if any, louder.