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450_gal

Spark Arrestor Effects

21 posts in this topic

Will adding a spark arrestor to my 2004 YZ450 make it harder to kick?

I've heard from different people that spark arrestors rob power and make it harder to get a bike started.

What's your experience?

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do the stock yz 450s specifically 07 have a spark arrestor or any kind of baffle??

because i always take the baffle/arrestor out of my play bikes but i have never been sure about my 450

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do the stock yz 450s specifically 07 have a spark arrestor or any kind of baffle??

because i always take the baffle/arrestor out of my play bikes but i have never been sure about my 450

No, they don't. Its a straight-through design muffler.

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Will adding a spark arrestor to my 2004 YZ450 make it harder to kick?

I've heard from different people that spark arrestors rob power and make it harder to get a bike started.

What's your experience?

I use DRD pipes on both of mine and I use the sparky only when I need it. Part of when I need it is during desert races when a tech inspection is actually done. I can't say that there is any noticeable difference with or without it.

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Mostly it will save your ass. By that I mean when the ranger rolls up on you it will be saving you a few hundred bucks, your weekend will not be shot, and you wont have to push your bike back to the truck. I learned all of that the hard way.

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A decently designed USFS approved spark arrestor will not hinder the bike's performance (or at least not enough to notice). I shouldn't have any effect on starting the bike either.

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I shouldn't have any effect on starting the bike either.
Well, no, I guess not. I mean, you're 2800 miles away. :thumbsup:

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I also have the PMB endcap with removable spark arrestor and there's no noticeable affect on the bike's performace or startability(is that a word:busted:). It looks nice and makes me legal for the trails:thumbsup:

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Our two stroke screen types would eventually plug up and wouldn't run on the top end.

Only seen one problem on a 4 stroke when the perforated tube broke up and collected on the screen with the packing

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Do you have to change jetting with the Pro Moto s/a end cap, and how much quieter is it going to be? I need to be at or below 96db, with my 07 yz450. I think the magazines say it already is, but the track I joined say everyone needs to be quiet!!! I'm fine with that:thumbsup: just looking for the right alternative than purchasing a new slip-on because as soon as I spend the hundreds I will prob thrash it :thumbsup:

Steve

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I put a PMB arrestor on my 02 426 a couple weeks ago, sound difference is not much, maybe a db or two. You can also pick up a silencer to fit your arrestor for and extra $40 or so though.

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Do you have to change jetting with the Pro Moto s/a end cap, and how much quieter is it going to be? I need to be at or below 96db, with my 07 yz450. I think the magazines say it already is, but the track I joined say everyone needs to be quiet!!! I'm fine with that:thumbsup: just looking for the right alternative than purchasing a new slip-on because as soon as I spend the hundreds I will prob thrash it :thumbsup:

Steve

No jetting changes needed.

Not quieter, either. Heck if anything, mine got louder because the outlet is larger diameter than the stock end cap.

They do sell a quiet insert that goes on the end of the PMB cap, basically all it does is direct the exhaust straight down so it sounds a little more quiet.

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Pretty surethat is aword. I also had the PMB endcap and never noticed any performance issues. I did however, get alot of crap from the guys I ride with. Put on an FMF Q4 and couldn't be happier.

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Pretty surethat is aword. I also had the PMB endcap and never noticed any performance issues. I did however, get alot of crap from the guys I ride with. Put on an FMF Q4 and couldn't be happier.

How did the Q4 affect performance? How much quieter is it over stock with the PMB cap?

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Stock muffler with PMB end cap and turndown (quiet tip) was as loud as stock, that's why I got so much crap from the guys I ride with. Q4 is noticably quieter. When I first got my '06, put a Q2 on it and hated it. Rode with it once and sold it because it killed the power so much. Q4, in comparison, smooths out the power and makes the bike a little more user friendly in the woods.

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