Strange Exhaust smell!

[Crazy about Banshee]

Hello to all.

 

 

Forgive me in advance for I am a 100% DIY'er and like a Monkey, when I SEE, I DO. And so after spending huge amounts of time reading your posts and looking at all the pictures, my story begins.......

 

 

One day while I was helping a friend clean his 4 stroke carb with a highly flammable cleaner (you spray into the carbs while in WOT) I decided to do the same on the Banshee, dumbass idea. You probably guessed it, burn a hole on the piston. Had the cylinders rebored next size up, new Pro-X pistons, rings, gasket etc. Decided to buy a dremel and began to grind away. Dont ask me what type of porting I did, perhaps you guys can tell me? Had the head skimmed to .030" and re-assembled the motor. It fired up with no problems but it smoked quite a bit and then I realized that I was still running a 20:1 mix. Changed the mix to 32:1 and ran a couple of heat cycles before taking it out for a controlled ride, you know, ride 10 minutes, cool down. During this ride I only smelt the normal 2-stroke smell.

 

 

The following week-end I joined some friends for a good ride and that’s when I noticed a strange exhaust smell, different from the normal 2-stroke oil. It smelled like jet fuel, hard to explain in words but I thought perhaps you guys can explain this one? I had visual confirmation from a friend that my pipes were smoking in case you wondering I might have too little 2S oil. The air temperate during the ride was +/- 90F and I was ridding hard. The bike runs great, beat a piped TRX450R if I may use it as a bench mark.

 

 

I know you have lots of questions and in no particular order I am just going to type what comes to mind;

 

 

Stock banshee with exception to unknown port & skimmed head, stock pilots, #200 mains, clip 2^nd from the flat part and stock pipes.

 

Elevation +/- 6000 feet

 

 

I checked the plugs and it is between light grey to the coffee with cream color,

 

I have checked for loss of tranny oil and water in the oil but all negative,

 

I have checked the radiator water, no loss.

 

Fuel type here in South Africa – Unleaded 95 octane, not sure of your equivalent.

 

Ratio 32:1 YamaLube 2S oil

 

I don’t really want to remove the head unnecessarily so I will wait until I receive your replies.

 

 

Thanks

 

Imageshack picture links;

 

http://imageshack.us/photo/my-images/210/snc00007hf.jpg/

 

 

 

http://imageshack.us/photo/my-images/189/snc00004pr.jpg/

 

 

[coryv4]

as a side note you are running a little too lean if you accually manage to do a good port job

[Coupelx]

as a side note you are running a little too lean if you accually manage to do a good port job

 

So porting = richer jetting?

[coryv4]

So porting = richer jetting?

[BUILDER]

Well since it is hard for us to figure out what you are smelling. If the plugs look good and it runs good and you are not loosing any fluids I say run it.

[camatv]

that smell is just me i farted a few weeks ago and it takes a lil time for the stank to make it to south africa

[06specialedition]

200's are really lean. I ride at 5000ft and the average stock carbed banshee we run takes 290-330's depending on the build. Are you still running stock pipes and filters...etc?

[Dicklez]

Thats the smell of Banshee death.

[Crazy about Banshee]

200's are really lean. I ride at 5000ft and the average stock carbed banshee we run takes 290-330's depending on the build. Are you still running stock pipes and filters...etc?

 

Yep, stock pipes & filters. Emailed various pipes companies in USA, CPI, TOOMEY, etc, they not interested in my business. Dont know how safe it is to buy from other members here and the stealers in SA want an arm & a leg for decent pipes. Anyone interested in supplying me a good set of used CPI's, shipped to South Africa?

 

Going for #320's followed by a plug chop.... Agree?

 

Thanks for all the replies.

[Jereme6655]

Doing a plug chop is the best way to dial in your jetting. As far as the pipe situation......i'd check with NYUK.......he deals in parts on here and i know for a fact on here that he has shipped parts all the way to Australia. He's an honest guy to deal with and he's not going to rip you off... alot of people on here can vouch for him....

[Coupelx]

 

well?

[BUILDER]

Good lord if you have the stock air box and stock pipes on it then by all means do not put 320 main jets in it the poor bike will not even run. People that are running that bike of a jet at your elevation are runnings pipes and pod filters. For a totally stock bike your jetting is really close.

[06specialedition]

Yep, stock pipes & filters. Emailed various pipes companies in USA, CPI, TOOMEY, etc, they not interested in my business. Dont know how safe it is to buy from other members here and the stealers in SA want an arm & a leg for decent pipes. Anyone interested in supplying me a good set of used CPI's, shipped to South Africa?

 

Going for #320's followed by a plug chop.... Agree?

 

Thanks for all the replies.

 

X2 with Builder......320's is WAY to much if you still have stock pipes and filters. I run 310's, but I have just about every bolt on and my cylinders are aggressive dune ported.