exhaust popping

[tubzilla]

i just took my sled out for a test ride last night and noticed a lot of popping in the exhaust. it starts, idles and runs fine. i just bought the sled and i'm not sure what jets are in it but it has aftermarket intake and exhaust. i put fresh gas and some seafoam in it about a month ago. do i just need to run some more gas and seafoam through it or does it sound like a jetting issue?

 

[04rxw10]

I have heard the the exhaust donuts going bad will do the same thing.

 

[tubzilla]

i should mention that the sled only has 3400 miles on it. would the donuts go bad that quick?

 

[04rxw10]

yup not that bad to do you need to pull the seat and gas tank to get to them. Give me a couple min i will find the link for you.

 

[04rxw10]

Here you go

http://www.totallyamaha.com/snowmobiles ... etRepl.htm

 

[tubzilla]

forgot to mention that it only happens when letting off the gas.

just a thought: i'm on a forum for my motorbike (inline 4) and i think i remember a similar problem that a guy had with an aftermarket exhaust. if i remember correctly one of the suggested remedies was bigger pilot jets. does that make sense?

 

[abj87]

My understanding is that a slight burbling under deceleration is normal. Could be wrong.

 

[Len Todd]

forgot to mention that it only happens when letting off the gas. ...

My bet is on exhaust donuts or loose donut clamps. You may have to take a little metal out between the two halves of the clamps to get them to clamp tightly.

 

[gunmaker]

So now that i have the exhaust out, how in the heck do you get it to line back up so you can clap it back together.

 

[Len Todd]

Sometimes you have to take the flex pipes out, put in the rest of the system, then put the flex pipes and new donuts back in.

 

[SMOKNZ]

My donuts were questionable with thie mileage on them right after I bought my sled used. I decided to not change them and they ended up blowing out on my and the bellow pipes then wore holes in both of my $350 titanium Y-pipes. Long story short change them before they end up costing you money. You can do it by loosening up the muffler and the y-pipes from their bracket under the gas tank. I then used a large screwdriver and gently compressed the bellows enough to get the new donuts on. It helps to have a second person pushing on the bellows and you installing the donuts. The Y pipes will only back up so far before hitting their mounting bracket. If you are lucy enough to no round off the allen head bolts, replace them with Stainless. I used a regular hex head and some antiseize on it. I should not have an issue getting these out in the future.

Bill

 

[yamahamaniac]

I have a stock exhaust on my '03 Rx-1 M and she also makes pops sometimes when decelerating. On I think it was three occasions she also made a decent backfire and had a very short/quick drop of power while it happened, and this was when I nailed the gas to go through a drift bank and up hill one time. Dealer said it has something to do with the exhaust but I can't remember what he said. I have to ask him again and fix it but after what SMOKNZ said about allen bolts down there I don't know if I want to do it myself. I freakin HATE allen bolts.

 

[HEAVYD]

My 04 would pop and crack and backfire at times.
installed 1 size larger pilots, took care of the promlem.

 

[Len Todd]

Yah, ... Altitude even affects this tendancy to pop. If you are running a bit lean, she pops. And, ... one size up in the pilots makes sense to correct a very slight lean at low to mid range. You may even get a rid of the popping by turning out the pilot screws 1/4 turn more than two turns from the bottom.

 

[Downlow350]

Im having the EXACT problem on my '03. I have the ecp kit, larger jests, and the rumble pack. I just had the carbs synced as well. It sounds like a bag of popcorn in the microwave when i let off. I replaced all of my exhaust dohnuts, and still the same. Its actually frustrating, because is is way more apparent with the louder exhaust! I dont know what else to do!