A question for those with "stage 2" cams... - Page 2 - SV650.org

29-09-06, 10:36 PM

Quote:

Originally Posted by northwind

So, you think you can ask questions on SV Rider, with your sekrit alterego, then come swanning back over here and ask the same ones do you, you rat!

I just feel the yanks have a bit more info on the subject as they seem to throw more money and time to the bike

northwind · 29-09-06, 10:58 PM

And did you, in fact, get the exact same answer over there?

29-09-06, 11:02 PM

Quote:

Originally Posted by northwind

And did you, in fact, get the exact same answer over there?

Its still in discussion

got more info about the cams from rob

but i am trying to find out the theory behind putting a size bigger jet in the front carb when jetting

johnnyrod · 02-10-06, 11:27 AM

It should run a little cooler than the rear cos it's infront, bit like IL4's that use different jet sizes in the middle two carbs cos they run hotter. Mine are both the same.

northwind · 02-10-06, 12:04 PM

Yep, but IL4s have heat transfer through the cylinder walls and cases, vtwins don't have that since they're totally seperate. It is a Mystery

Mine are both the same and it works, so I don't worry about it.

johnnyrod · 03-10-06, 11:39 AM

I'm sure you're right. What setup did you end up with? As far as I can think mine has a Dynojet kit with K&N filter, 138 mains, stock pilot settings (17.5 jet and 2.5 turns out), needle on 3rd clip from bottom (I think, with the plastic doughnut under it you can see one groove only underneath). Dyno says it's pretty much optimum.

northwind · 03-10-06, 12:19 PM

Not going to say I'm spot on, just that it works OK so I've not put any more thought into it. I'm on DJ 180s now... I saw TWF mention on SV Rider that part of the reason is that the carb itself is hotter from engine heat- makes more sense to me that, since the aircooling's not a major part of the cooling effect on liquid cooled motors usually. He knows better than me

johnnyrod · 04-10-06, 11:38 AM

180 is pretty big, any idea how far out it might be?

Ther eis a rich spot on full throttle for mine, around 6-7000rpm, haven't done anything about it but now know that riding at 80 everywhere is worth 8mpg more than riding at 90! Might have to have a tinker... or go faster...

northwind · 04-10-06, 03:09 PM

180's what mine needs... Or at least, we ran it with 175s and it was lean at the top still, still to run it again with the new idle settings and the 180s but it's going to be very close. But whether it'd do better with a different jet front and back, don't know.

You can make a simple lambda pickup and reader for under £100, if I had my prices right, using parts from the home of quality components, Demon Tweeks

04-10-06, 06:06 PM

Quote:

Originally Posted by northwind

You can make a simple lambda pickup and reader for under £100, if I had my prices right, using parts from the home of quality components, Demon Tweeks

Or buy a Bosh Lambda from Eurocarparts for £19.99 and tape a Multimeter to the tank

29-09-06, 10:58 PM	#12
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	And did you, in fact, get the exact same answer over there? __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

02-10-06, 12:04 PM	#15
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Yep, but IL4s have heat transfer through the cylinder walls and cases, vtwins don't have that since they're totally seperate. It is a Mystery Mine are both the same and it works, so I don't worry about it. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

03-10-06, 12:19 PM	#17
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Not going to say I'm spot on, just that it works OK so I've not put any more thought into it. I'm on DJ 180s now... I saw TWF mention on SV Rider that part of the reason is that the carb itself is hotter from engine heat- makes more sense to me that, since the aircooling's not a major part of the cooling effect on liquid cooled motors usually. He knows better than me __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

04-10-06, 03:09 PM	#19
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	180's what mine needs... Or at least, we ran it with 175s and it was lean at the top still, still to run it again with the new idle settings and the 180s but it's going to be very close. But whether it'd do better with a different jet front and back, don't know. You can make a simple lambda pickup and reader for under £100, if I had my prices right, using parts from the home of quality components, Demon Tweeks __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Using "Pointy" Tensioners in a "Curvy"?	dtr125	SV Talk, Tuning & Tweaking	25	05-02-09 05:42 PM
teh "what you doing this weekend thread"...sponsored by Chesley "Sully" Sullenberger the Third	keithd	Idle Banter	30	18-01-09 11:47 AM
Rideout "Sections" or "Groups"	independentphoto	Bikes - Talk & Issues	19	04-09-07 01:08 PM
Rear Cylinder "thunking" probably the cams...help	Torn-Thorax	SV Talk, Tuning & Tweaking	3	07-12-06 01:44 AM
Suspension "Balance" question.	independentphoto	SV Talk, Tuning & Tweaking	6	09-06-06 11:43 PM

02-10-06, 11:27 AM	#14
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	It should run a little cooler than the rear cos it's infront, bit like IL4's that use different jet sizes in the middle two carbs cos they run hotter. Mine are both the same.

03-10-06, 11:39 AM	#16
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	I'm sure you're right. What setup did you end up with? As far as I can think mine has a Dynojet kit with K&N filter, 138 mains, stock pilot settings (17.5 jet and 2.5 turns out), needle on 3rd clip from bottom (I think, with the plastic doughnut under it you can see one groove only underneath). Dyno says it's pretty much optimum.

04-10-06, 11:38 AM	#18
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	180 is pretty big, any idea how far out it might be? Ther eis a rich spot on full throttle for mine, around 6-7000rpm, haven't done anything about it but now know that riding at 80 everywhere is worth 8mpg more than riding at 90! Might have to have a tinker... or go faster...