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If i stubby my can

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Damon
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Joined: 24 Aug 2007
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PostPosted: 18:18 - 24 Nov 2007    Post subject: If i stubby my can Reply with quote
will i have to mess about with the fueling to get it running properly. im looking to take about two inches off. will this affect my bike at all.

Cheers all Smile Thumbs Up

Last edited by Damon on 18:27 - 24 Nov 2007; edited 1 time in total
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 18:20 - 24 Nov 2007    Post subject: Reply with quote
It might - you'll have to do the mod to find out. Do a plug-chop afterwards to check the WOT fuelling.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Damon
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Joined: 24 Aug 2007
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PostPosted: 18:31 - 24 Nov 2007    Post subject: Reply with quote
is their any easier ways to determine other than a plug chop. Seems like a lot of work and i dont like the idea of butchering perfect new plugs.

Thanks
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Pete.
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PostPosted: 19:10 - 24 Nov 2007    Post subject: Reply with quote
Dam0n wrote:
is their any easier ways to determine other than a plug chop. Seems like a lot of work and i dont like the idea of butchering perfect new plugs.

Thanks


Very Happy Very Happy

Sorry buddy but that made me smile. A plug-chop does no harm to the plug at all and in fact should be done with a new spark plug fitted.

Ride along at full throttle for a bit (1/2 mile or so), then chop the throttle and pull-in the clutch, then kill the engine and coast to a stop. Now remove one of your plugs and look at the colour to determine what your mixture is at full throttle.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Finglonga
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PostPosted: 19:41 - 24 Nov 2007    Post subject: Reply with quote
. . . . Then get a big axe . . . . Wink
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hmmmnz
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PostPosted: 20:14 - 24 Nov 2007    Post subject: Reply with quote
hehehehe lol funny stuff Very Happy
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lllN30lll
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Joined: 12 Jun 2005
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PostPosted: 20:18 - 24 Nov 2007    Post subject: Reply with quote
Dam0n wrote:
is their any easier ways to determine other than a plug chop. Seems like a lot of work and i dont like the idea of butchering perfect new plugs.

Thanks

that's proper Sig material but i've got no room.
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Pete.
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PostPosted: 23:55 - 24 Nov 2007    Post subject: Reply with quote
LukeVFR wrote:
I cut my R6's Micron can in half, and it didn't affect performance what-so-ever,


Isn't your bike fuel-injected? It would have less of an effect than his little stroker.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Damon
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Joined: 24 Aug 2007
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PostPosted: 00:40 - 25 Nov 2007    Post subject: Reply with quote
lol my bad, Wink

dont i have to cut the thread down to the base and see if there is a brown coloured line on the plug?
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Nb
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Joined: 17 May 2005
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PostPosted: 10:19 - 25 Nov 2007    Post subject: PLUG CHOP Reply with quote
Quote:
Confirm your jetting with plug chops
A plug chop simply means looking at the sparkplug to determine how you are jetted at a particular throttle stage. The only tricky part is in isolating the throttle stage. Before starting, clean your sparkplug and filter and warm the bike up.

To check the main jet, which operates from 1/2 to full throttle, get the scooter up to a steady full throttle or near to it for a good few seconds, then simultaneously pull in the clutch and kill the engine. Don't let the motor drag you to a stop, or fall to an idle, because you want to isolate the plug color at full throttle.

Get off and check the sparkplug color. (Links on our tech page.) It should be a light chocolate color. If it's white, the air/fuel mixture is too lean and you need a bigger main jet. If it's black or really dark brown, the air/fuel mixture is too rich and a smaller main jet is needed. If you need to change jets, change by one size, and do another run.


No cutting tools needed. Laughing

Take a look here also, https://www.dansmc.com/EXHAUST_2.htm
My advice? Leave the bloody thing alone before it goes bang. Wink
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Last edited by Nb on 17:23 - 25 Nov 2007; edited 1 time in total
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 10:28 - 25 Nov 2007    Post subject: Reply with quote
I'd have said that Aprilia spend millions of pounds of development on two stroke exhausts, which are MUCH more essential for performance than on four strokes.

The cans are tiny anyway, so why you would want to stubby it I'll never know.

And LukeVFR, you say your bike's performance has not been affected? How can you tell? Have you dynoed it before and after the mod?

I reckon most people wouldn't notice a 10bhp difference in a 600, especially if the bike is louder to boot...
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Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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Damon
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Joined: 24 Aug 2007
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PostPosted: 11:23 - 25 Nov 2007    Post subject: Reply with quote
[quote="MarJay"]I'd have said that Aprilia spend millions of pounds of development on two stroke exhausts, which are MUCH more essential for performance than on four strokes.

The cans are tiny anyway, so why you would want to stubby it I'll never know.
[quote]

I just would like something thats custom to me. quite like the idea of a tiny can.

I was gonna buy an arrow can anyway, but thought i could stubby the original can, and if it goes tits up, then buy the arrow can.

Does stubbying a can typically mke it run rich or lean?

Thanks all Thumbs Up
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Finglonga
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PostPosted: 11:37 - 25 Nov 2007    Post subject: Reply with quote
Dam0n wrote:

I was gonna buy an arrow can anyway, but thought i could stubby the original can, and if it goes tits up, then buy the arrow can.


If you don't do it right the first time the "going tits up" bit may be a seize or a holed piston. Shocked Is it worth taking the chance?
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Last edited by Finglonga on 15:55 - 25 Nov 2007; edited 1 time in total
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Damon
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Joined: 24 Aug 2007
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PostPosted: 11:40 - 25 Nov 2007    Post subject: Reply with quote
Finglonga wrote:
Dam0n wrote:

I was gonna buy an arrow can anyway, but thought i could stubby the original can, and if it goes tits up, then buy the arrow can.


If you don't do it right the first time the "going tits up" bit may be a seize of a holed piston. Shocked Is it worth taking the chance?


shit really? I thought it would make a minimum of difference. Is there anything i could do that wouldnt result in a siezed piston? change the jetting etc? Thumbs Up


Thanks all
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Philious
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Joined: 28 Jun 2005
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PostPosted: 11:53 - 25 Nov 2007    Post subject: Reply with quote
lllN30lll wrote:

that's proper Sig material but i've got no room.


Lol yeah your sig is jam packed, I thought we was only meant to have 3 lines?

Thinking

Dam0n wrote:

shit really? I thought it would make a minimum of difference. Is there anything i could do that wouldnt result in a siezed piston? change the jetting etc?


Erm how about leaving it standard and just being happy with it as it is. Thumbs Up
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MarJay
But it's British!



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PostPosted: 14:57 - 25 Nov 2007    Post subject: Reply with quote
Dam0n wrote:

shit really? I thought it would make a minimum of difference. Is there anything i could do that wouldnt result in a siezed piston? change the jetting etc? Thumbs Up


Thanks all


No, it could result in a holed piston. Which is worse. Parts of the piston may be flung about inside the engine causing all sorts of untold damage.

It isn't worth it IMO.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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Finglonga
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PostPosted: 15:54 - 25 Nov 2007    Post subject: Reply with quote
Flipk wrote:
lllN30lll wrote:

that's proper Sig material but i've got no room.


Lol yeah your sig is jam packed, I thought we was only meant to have 3 lines?

Thinking



Thats the size of your tiny tiny screen, lllN30lll's sig is only 1and a half lines with me. Thumbs Up
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01dabreoo
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PostPosted: 15:58 - 25 Nov 2007    Post subject: Reply with quote
Cans on 2 stokes make very very little difference, would be fine running without one imo.
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Damon
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Joined: 24 Aug 2007
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PostPosted: 16:37 - 25 Nov 2007    Post subject: Reply with quote
01dabreoo wrote:
Cans on 2 stokes make very very little difference, would be fine running without one imo.


? how come you are telling me this but ive just been told the opposite in the above thread?

ahhh who to believe.... ahhh im going to start talking to myself in a minute. Wink
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01dabreoo
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PostPosted: 17:12 - 25 Nov 2007    Post subject: Reply with quote
2 stokes get all their back pressure from the expansion chamber, the cans are purely just to make them quieter.
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Damon
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Joined: 24 Aug 2007
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PostPosted: 22:00 - 25 Nov 2007    Post subject: Reply with quote
01dabreoo wrote:
2 stokes get all their back pressure from the expansion chamber, the cans are purely just to make them quieter.



so i can stubby the can with not ill effects?

just to clarify Thumbs Up
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01dabreoo
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PostPosted: 22:03 - 25 Nov 2007    Post subject: Reply with quote
I believe it wont Razz
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Chriss
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Joined: 07 May 2005
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PostPosted: 22:15 - 25 Nov 2007    Post subject: Reply with quote
See my dyno results for what happens when you put a set of stubby cans on a bike. I lost around 7 peak hp from stock, but loads over all, and it was running wwaaaaayyyyyy lean.
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NSR Mick
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PostPosted: 22:23 - 25 Nov 2007    Post subject: Reply with quote
Is 2 inches really worth the effort?

By all means go for it as it wont affect your mixture that much.
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 22:36 - 25 Nov 2007    Post subject: Reply with quote
I stubbied my can this week - I wonder what effect it will have?
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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