First I just want to say hello to everyone. I have been lurking the forum for a while reading up on a lot of info. I decided the forum was great, loaded with info and decided to join.

I have owned a 2003 650 ds baja for the past year. I have recently started having the mod bug. I want to start modding my bike this year. However as of yet the only thing I have is I cleaned my stock exhaust (packing and baffle). I still have the spark resistor in.

This past weekend I noticed I had some raw fuel puddling in the pipe. When I turn the bike off I hear a puff sound. I assuming this is rich condition? I believe this was caused do to running 93 octane this time around. I read somewhere on here I should be running low octane. Is that true? Is the 93 causing the raw fuel left in the pipe?

 

what mods have you done changed piston at all????? you should be alright running 87 octane.. if you still have stock piston. if you are running 93 you might not get all the power out of the bike you want you will be running it to rich you will have a gasey smell when running... as for gas being in your pipe you may need to see if your fuel line maynot be on all the way petcock leaking carb leaking i would check this stuff if you have stock carb make sure you shut the petcock off they like to leak is it leaking were the front pipe and rear pipe connects on the motor...this would be the carb leaking... hope this helps... welcome aboard

 

Thanks for the welcome and reply. The only thing I done to the bike thus far is cleaned the packing and took the baffle out of the stock pipe. The spark resistor is still in.

Everything is stock down to the original tires. This quad has been riden very little. As you can imagine by still having the stock tires on it. The first time I noticed this problem was last weekend I put about a half tank of 93 octane in to top it off.

I do not see any leaks no strong smell. It has been a while since I rode the bike. Can't remember what gas I was using in the past.

 

If you fueled all the way to the top there is a vent tube at the top of the fuel tank that if to full it will drain it back to the ground maybe this is your problem. you can't see it. its alittle but a long hose...

 

Your supposed to run the good gas in these bikes, i always run 93. I dont see how u can have raw fuel IN your muffler, but if u play with it - aka take the packing out, it will need to compensate for the free'er flowing exhaust, so take your air box lid off and run it, see what the difference is.
I remember during the "stock" days, just taking the end cap off all together and going for a spin, sounded like a BIG harley lol, was sick! but at the end of the ride it would give the PUFF out the muffler, prob didnt help that there wasnt any back pressure [img]i/expressions/face-icon-small-smile.gif[/img] haha

 

<div class="FTQUOTE"><begin quote>Originally posted by: YAMASUXHONDUST

what mods have you done changed piston at all????? you should be alright running 87 octane.. if you still have stock piston. </end quote></div>

Don't run less than 93....... The bike is designed and built from the factory to run off of no less than 92.

 

<div class="FTQUOTE"><begin quote>Originally posted by: DS650ryder

<div class="FTQUOTE"><begin quote>Originally posted by: YAMASUXHONDUST



what mods have you done changed piston at all????? you should be alright running 87 octane.. if you still have stock piston. </end quote></div>



Don't run less than 93....... The bike is designed and built from the factory to run off of no less than 92.</end quote></div>

Depends on your elevation and type of air. If you are at sea level, do not run less then Manufacturer recommended. If you are in the mountains, then lower octane is fine as there is a lower oxygen count at higher elevations. If the air is wet and/or very hot, it is like being at a higher elevation. Dry cold air would be like low evelvation

 

Check your float bowl height and the clearances of the valves.
Also get in the habbit of turning off the gas when not in use.
Grade of fuel is strictly for those looking for performance.
As far as what the factory recommends, they also said never to use synthetic oil.
Now when you ask the dealer what they recommend, rotax synthetic oil!!!!!!!

 

I always ran 87 Octane when I had a stock piston, even at sea level. When I replaced with an 11.5 JE the stock piston looked good as new. Ran great.

Matter of fact, you will get the best power with the lowest octane fuel you can run without pinging.