Running Rich/ Smell Gas Fumes???

[big mike]

Hi everyone. Last weekend I put on my punched out R/K mufflers and I absolutly love them, great deeeeep rumble just right!!! When I punched them out I put several small holes on the inlet side baffles, and about six 3/8" holes on the outlet plate at the back side of the muffler if you are looking at the back of the mufflers while mounted on the bike. You can also look straight through the muffler from the inlet side to the outlet side as the center baffles were removed when I got them.

 

Now for my question. I can smell unburned fuel/fumes not only while warming up the scoot but also while riding on my 25 mile commute to work, does this mean that the bike is now running rich and needs to have the carbs ajusted or the bike tuned due to being able to breathe better? I have never had this bikes carbs tuned as I have just bought it in January. However I did do a tune up with plugs, fuel filter, checked air filter, used some marvel mystery oil in with the gas on a tankfull, and I put a fresh oil and filter change with mobil 1 mc oil. It seems to run well I just wonder if it could be running better or if this fuel smell is normal with what I have done????

 

Has anyone ever run into this before? As always any info would be greatly appreciated. Thank You All in advance.

 

Big Mike

[BuddyRich]

First thing is run some seafoam thru it. If anything you should be running lean if you have better airflow and not rejetted for it. But these bike don't need rejetting after changing the pipes.

[big mike]

First thing is run some seafoam thru it. If anything you should be running lean if you have better airflow and not rejetted for it. But these bike don't need rejetting after changing the pipes.

 

Thank You for your feedback Buddy. Just a question though. Isn't seafoam the same as Marvel Mystery Oil? Because I used that already.

 

Big Mike

[hipshot]

Thank You for your feedback Buddy. Just a question though. Isn't seafoam the same as Marvel Mystery Oil? Because I used that already.

 

Big Mike

don't mean to butt in here, mike, but to answer your question, NO, marvel mystery oil is more of an "upper cylinder lubricant".

sea foam is more of a "gunk "cleaner.

just jt

[big mike]

Thanks JT that is what I needed to know. I appreciate it.

 

Big Mike

[Guest tx2sturgis]

Not knowing if the mixture screws have been adjusted, I'd guess it has been running rich on one or more carbs and you are just now noticing it with a free-er flowing exhaust.

 

It could be a small exhaust leak where the new mufflers connect to the header pipe.

 

How's your gas mileage?

 

[big mike]

Not knowing if the mixture screws have been adjusted, I'd guess it has been running rich on one or more carbs and you are just now noticing it with a free-er flowing exhaust.

 

It could be a small exhaust leak where the new mufflers connect to the header pipe.

 

How's your gas mileage?

 

 

 

When i'm really getting on it, which is most of the time, I have been around 40 to 41 miles per gallon the last 3 or 4 fill-ups. However this last fill up was 38.5 miles per gallon. This was the only tank of gas I put in since the new mufflers were installed, so I'm not sure if I really dropped from the mufflers, or just from listening to the new sound at stop lights.

 

Big Mike

[juggler]

When i'm really getting on it, which is most of the time, I have been around 40 to 41 miles per gallon the last 3 or 4 fill-ups. However this last fill up was 38.5 miles per gallon. This was the only tank of gas I put in since the new mufflers were installed, so I'm not sure if I really dropped from the mufflers, or just from listening to the new sound at stop lights.

 

Big Mike

 

 

Heck that's better millage than I ever get no matter how well the bike is tuned.