ok ok... (With New Video)

[Damon]

Yes i know alot of people said not to do it, but i stubbied my can over the last few days and just put it onto my bike.

It sounds great and looks brilliant but i have one small problem...

It is kicking out white/blue smoke like it is warming up, even when it is warm. I take it means that there is incomplete combustion and i may have to change the fuel:air ratio

Can someone clarify my guess or tell me what is wrong? Yes i know i have been told by some not to do it in the first place, but i live and learn.

Thanks everyone for all your help so far.

Karma given as always

[stinkwheel]

I hope you mean you just stubbied the end can and haven't been chopping up the rest of it? That would be bad enough.

You do realise that 2-stroke exhaust dimensions are calculated by the bore, stroke and port timing of the engine rather than the quantity of fuel delivered by the carburettor? The length of the free portion after the 'double cone' is one of the critical measurements so you get the correct pattern of pressure waves inside the exhaust.

Your smoke is probably unburned/partially burned fuel coming out of the end of your exhaust that would ordinarily have been stuffed back into the engine by the pressure waves.

Since it's already done now and would be difficult to make longer again, I'd suggest fitting some sort of baffle in the end to slow the gas down a bit.

You can check your mixture by doing some plug chops.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[c_dug]

this doesnt sound as clever as stinkwheels answer and it may not be right but i would have guessed that its just because theres less end-can to "filter" the exhause gasses, i could be completly wrong but it makes sence to me

dont mean to hijack the topic but stinkwheels you dont have a 2 stroke shop in essex do you? i bought something off a guy on ebay by the same name???

c_dug
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[stinkwheel]

[c_dug]

[Damon]

na it was just the can. I thought it only mattered if i cut down the expasnsion chamber or anything before it. I didnt think the waves passed this point.

Im sure i was told somewhere that it would be ok to run a RS125 without a can at all?

[Vincent]

I thought "stubby" cans were a four stroke thing As stinkwheels says, theres a lot of work goes into designing expansion chambers and I'm guessing that the end cans were specificaly made that size to run with the pipe. Once you start chopping them up and changing dimmensions you're risking severe damage to the motor. Four strokes are a bit more forgiving.

[Finglonga]

Us in the know warned you not to do it.
____________________
Andy Sez....
F.Y.Y.F.F.

[stinkwheel]

Depends on the bike. An optimum 2-stroke exhaust has a fairly long 'stinger' on the end of it. The end-can replicates this effect and damps down some of the noise into the bargain.

The length of the stinger is quite important.

The bike on the following picture (Yamaha 500 engine) has an exhaust system designed for maximum power and nothing else. You can clearly see the stinger on it.

Now if it wasn't required or the bike would have gone faster with a shorter one, it wouldn't be there. That bike will run a 9.03 second standing 1/4 mile.
https://www.bikechatforums.com/files/tooley.jpeg
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Vincent]

[Vincent]

[Vincent]

S'not an RD is it? where's the other pipes I can only see 1.

[stinkwheel]

[Vincent]

I didn't notice the forks - too busy looking for the other three pipes. Looks fun.

[gamerboy]

hmmm dont blue smoke mean worn rings ?

[Damon]

So What do people recommend then?

Shall i stick an arrow can on the end? Or does anyone have a standard silencer for a new shape rs i could buy.

Thanks for the answers

[veeeffarr]

Jesus, you must have some cash to burn if you can afford to wreck a 2006 bike :/

T

[Vin]

[acwman]

..show us all to see!!!

..I too need a laugh!
____________________
BMW R1200GS & Honda Fireblade 929RR
Bikes owned -Yamaha R1+akrapovic, Ducati 749S, Power Commander + Termi's,Buell XB12R - with race kit, GSXR600-K4 Titanium Scorpion end Can, ZXR400, RS125, Cagiva Mito, RS50, RG125, ER50, FS1E. https://www.bikepics.com/members/acwman/

[Damon]

here Vin. Have a good laugh....

https://img227.imageshack.us/img227/495/dsc00729dd5.jpg

[Damon]

https://img227.imageshack.us/img227/8454/dsc00730rq2.jpg

https://img227.imageshack.us/img227/3804/dsc00734cq5.jpg

https://img408.imageshack.us/img408/2199/dsc00735uv5.jpg

[acwman]

You done quite a good job there

..Just a shame about all the blue smoke!

Have you tried taking it to a garage to check out the mixture, and if anything can be done? Just seems a shame going through all the hassle off the mod, and not being able to use it!
____________________
BMW R1200GS & Honda Fireblade 929RR
Bikes owned -Yamaha R1+akrapovic, Ducati 749S, Power Commander + Termi's,Buell XB12R - with race kit, GSXR600-K4 Titanium Scorpion end Can, ZXR400, RS125, Cagiva Mito, RS50, RG125, ER50, FS1E. https://www.bikepics.com/members/acwman/

[Damon]

https://www.youtube.com/watch?v=dZv3xZN3r5c

This is what is sounds like.

EDIT yeah i will take it to a garage, but i think i will be a bit embarrese d about telling them of my stupidity.

One more pic of the inside....



https://img144.imageshack.us/img144/333/dsc00733we6.jpg

[acwman]

...Sounds nice aswell!

btw.. your bike needs a clean!
____________________
BMW R1200GS & Honda Fireblade 929RR
Bikes owned -Yamaha R1+akrapovic, Ducati 749S, Power Commander + Termi's,Buell XB12R - with race kit, GSXR600-K4 Titanium Scorpion end Can, ZXR400, RS125, Cagiva Mito, RS50, RG125, ER50, FS1E. https://www.bikepics.com/members/acwman/

[Damon]

Yeah i know, it just seems like whenever i get back from work its pitch black outside and freezing cold. That rear hugger is quite dirty to say the least... actually, i prefer the term "well used"