Under Tunnel Exhaust Pics with Track and Skid installed

[rlcofmn]

^ dunno about this guy...
last time i checked, the front shaft and the upper iddlers DONT move with the suspension...so unless your rear axle manages to go PAST the upper idlers...
all you need to worry about is 1-2" of balloning at high speeds and braking.

I agree, but I compressed it anyways. It did not change. The track will balloon out.

I think compressing of the suspension comes from the MTX guys who can push the muffler WAY back to have the muffler past that top idler. They need to copress that back half, but us rtx and xtx guys have to have that muffler sitting abover the idler.

False, If you compress just the rear of the skid. The track will lift off the wheels a couple inches.

141 Cat float skid.

 

[beeze455]

THANKS AND WOW.

I thought I had it all the way down.

I am thinking the undertunnel exhaust is just not going to work. I hope i am wrong again!

 

[beeze455]

How far does the SDR muffler drop?

 

[raginyamaha]

i belive it is just over 2 inches. Maybee Kyle (SDR himself) will chime in, he builds them and tested them. i havent riden yet...

 

[Turtle]

False, If you compress just the rear of the skid. The track will lift off the wheels a couple inches.

141 Cat float skid.

Maybe the cat skid is different. But I'm pretty sure because of the design geometry of the Yamaha skid, the track tension actually increases as it is compressed.

 

[rlcofmn]

False, If you compress just the rear of the skid. The track will lift off the wheels a couple inches.

141 Cat float skid.

Maybe the cat skid is different. But I'm pretty sure because of the design geometry of the Yamaha skid, the track tension actually increases as it is compressed.

I'm not sure I'm understanding you? This is just showing that the rear wheel's travel higher than the idlers. Am I missing something here?

Beeze, I would not say all is lost, this tunnel makes it look like there is much less room than there is with the stock tunnel. I ran a 3.5" muffler all season 2 years ago with my 2.5 track. It had a few marks from track slap but noting worth worrying about. I was definitely pull your rear float and jack up the back till you hit the bump stops though.

 

[beeze455]

False, If you compress just the rear of the skid. The track will lift off the wheels a couple inches.

141 Cat float skid.

Maybe the cat skid is different. But I'm pretty sure because of the design geometry of the Yamaha skid, the track tension actually increases as it is compressed.

I'm not sure I'm understanding you? This is just showing that the rear wheel's travel higher than the idlers. Am I missing something here?

Beeze, I would not say all is lost, this tunnel makes it look like there is much less room than there is with the stock tunnel. I ran a 3.5" muffler all season 2 years ago with my 2.5 track. It had a few marks from track slap but noting worth worrying about. I was definitely pull your rear float and jack up the back till you hit the bump stops though.

Not gonna be home for a few days, but am happy to hear what you had. Do you know if it is true that the MTX tunnel has more room then the XTX and RTX?

If i need to, I could lower the rear of the skid.

 

[rlcofmn]

My sled was a shortened MTX so I am not sure since I have not had a xtx but I would not see why it would be any different as long as the skid swap was done in the same location's. Just have to be careful with any skid swap to make sure your suspension performance is your number one goal. The tunnel in the picture is last years sled and because of my lack of tunnel clearance I was having to jack with my skid locations and this is why that chassis is outside rusting away. Your suspension needs to be where it should be if you want a properly handling sled, my tunnel last year did not have enough clearance so I should have gotten rid of my under tunnel and I probably would still be riding that chassis.

I think you should be able to make it work though.

 

[stopdropanroll]

How far does the SDR muffler drop?

Our muffler is 2 7/8 total height, plus about 3/8 more for mounting hardware, so just over 3" hanging down. I am not saying yours wont work, but the mount and the clamp must be changed, I had a pretty beefy mount when I ran my Jardine pipe and at the end of the year I was messing with it all the time and had to do some trail side fixes. Our system is super solid and very thin.

 

[NFLD-Nytro]

How far does the SDR muffler drop?

Our muffler is 2 7/8 total height, plus about 3/8 more for mounting hardware, so just over 3" hanging down. I am not saying yours wont work, but the mount and the clamp must be changed, I had a pretty beefy mount when I ran my Jardine pipe and at the end of the year I was messing with it all the time and had to do some trail side fixes. Our system is super solid and very thin.

Can't find you online anywhere. Where do I find out more about SDR exhaust?

 

[beeze455]

SDR - thanks for the info and I always appreciate constructive criticism. I also followed your thread from page 1 on your exhaust, so I know you have an idea of what is going on. LOL.

SDR's exhaust I think is in transition to be being sold sold by OFT.


When I get home in a few days I am going to compress my suspension and see if it hits. If it does not, I am going to fab up a protector and use something better then a hose clamp.

perhaps i should just stop being a cheap #*$&@.

 

[BigECB]

How far does the SDR muffler drop?

Our muffler is 2 7/8 total height, plus about 3/8 more for mounting hardware, so just over 3" hanging down. I am not saying yours wont work, but the mount and the clamp must be changed, I had a pretty beefy mount when I ran my Jardine pipe and at the end of the year I was messing with it all the time and had to do some trail side fixes. Our system is super solid and very thin.

Can't find you online anywhere. Where do I find out more about SDR exhaust?

Check this thread out:

http://www.ty4stroke.com/viewtopic.php? ... sc&start=0

 

[Alatalo]

^ dunno about this guy...
last time i checked, the front shaft and the upper iddlers DONT move with the suspension...so unless your rear axle manages to go PAST the upper idlers...
all you need to worry about is 1-2" of balloning at high speeds and braking.

Nobody said the front shaft and upper idlers move with the suspension stroke, but you might want to check where your rear axle wheels end up at full suspension stroke. Especially with the suspension in the full weight transfer position (extended front and fully compressed rear). From what I remember, they DO end up above the upper idlers in most Yamaha skids. For instance, maximizing the weight transfer is a brilliant way of puncturing the additional rear cooler of the Attak / Apex LTX, I can not believe Yamaha missed this one...
If you do not get what I am talking about, please refer to the above posted pic of the cat skid.

 

[raginyamaha]

How far does the SDR muffler drop?

Our muffler is 2 7/8 total height, plus about 3/8 more for mounting hardware, so just over 3" hanging down. I am not saying yours wont work, but the mount and the clamp must be changed, I had a pretty beefy mount when I ran my Jardine pipe and at the end of the year I was messing with it all the time and had to do some trail side fixes. Our system is super solid and very thin.

Can't find you online anywhere. Where do I find out more about SDR exhaust?

PM stopdropandroll or look at the SDR Undertunnel posts that i just bumped to the top.

 

[ruffryder]

I'm not sure I'm understanding you? This is just showing that the rear wheel's travel higher than the idlers. Am I missing something here?

agreed. I found the same thing out last year. One thing to not is rlcofmn has 8" wheels, not the stock 7 1/4" wheels. Also, some skids have tipped up rails. Getting straight rails or bending them straight (what I am going to do) should help with the clearance problem as well.