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Re: Sound level with exhaust mod [Re: Moto Psycho] #35623 07/21/08 01:19 AM
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ozarkjeep Offline
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ok,
I did this mod ( 1.5" hole)

it IS stronger, it IS louder.

but its surging on the idle circuit.

Ive drilled and removed the low jet plug, and I recall setting it to 3.0 turns out.

how many turns out can I go before the adjustment becomes ineffective?

and what is the vacuum tube mod, or the UK carb mod?

bike is a 2000, manufacturer date 1999...


new to the xt225, but loving it
Re: Sound level with exhaust mod [Re: ozarkjeep] #35627 07/21/08 01:59 AM
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Moto Psycho Offline
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 Originally Posted By: ozarkjeep
how many turns out can I go before the adjustment becomes ineffective?

I would not go passed 3.5 turns to 4 turns at the very most. Have you re-jetted your carb, or just did the "3-turn" mod? If you have not re-jetted, you might try going up a step to the 42.5 pilot jet, or shimming your needle....

Re: Sound level with exhaust mod [Re: Moto Psycho] #35628 07/21/08 02:15 AM
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ozarkjeep Offline
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bike is totally stock, except that I removed that pilot screw adjustor cap, and turned it to 3 turns, and then cut a 1.5 inch hole into the muffler as per the z1 mod.

Ive read thru these 16 pages and most folks that changed to the 42.5 pilot jet, ended up swapping BACK to the 40 size.

I might shim the needle, although, that too ive read here, was done and re-done.

typical of my mods, they never quite work out like everyone else mods do.

I once knocked the baffles out of a honda shadow, and it was then too lean to run, it sat in the garage for a week until I got a dyna-jet kit in the mail.



 Originally Posted By: Moto Psycho
 Originally Posted By: ozarkjeep
how many turns out can I go before the adjustment becomes ineffective?

I would not go passed 3.5 turns to 4 turns at the very most. Have you re-jetted your carb, or just did the "3-turn" mod? If you have not re-jetted, you might try going up a step to the 42.5 pilot jet, or shimming your needle....


new to the xt225, but loving it
Re: Stock Exhaust Performance Mod [Re: Z1XT225] #35910 07/24/08 10:34 PM
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Skeerman Offline
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So who has done this on a new 250? I am in the process if trying to get it done and I am running into a few hickups.I bought an extension that won't fit in my drill and I bought a metal hole saw that wont fit in my extension. SOOO.... I am going to buy the biggest longest bit I can and then use a tapered bit to grind out the hole lie z1 did. Do I need to woory about the shavings or are those going to blast out the end like I am hoping they will? Thanks!


GO!!!
Re: Stock Exhaust Performance Mod [Re: Skeerman] #35919 07/25/08 01:08 AM
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Moto Psycho Offline
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 Originally Posted By: Skeerman
Do I need to woory about the shavings or are those going to blast out the end like I am hoping they will? Thanks!

I took my pipe off the bike to do this. I didn't want to take any chance of getting shavings doing any harm....

Re: Stock Exhaust Performance Mod [Re: Moto Psycho] #35927 07/25/08 03:02 AM
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Mark R Offline
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I didn't take mine off but the drilled out piece fell inside after it cut through so I ended up taking it off anyway. In hindsight, after seeing how easy it was to take off and put back on, I would have taken it off in the first place.


2008 XT250
Re: Stock Exhaust Performance Mod [Re: Mark R] #35967 07/25/08 05:38 PM
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Skeerman Offline
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Well, I got impatient with my project, and bought a long drill bit drilled several holes in a circle on the baffel. Tonight I am going to pop the piece out and grind the circle to a nice looking circle. I started it up, and with a roar a shower of small metal came out like fireworks on the fourth of July. It sounds mean with the SA out and my neighbor with a VRod even turned around and looked as he was polishing his V-twin and gave an aproving nod. I also installed some after market turn signals, I am next installing an Acerbis Cyclops head light, and then more to come after that.....I am working towards my genre of a bike "supermoto/dirt racer". Man not much better than tinkering and making the bike you want to ride.


GO!!!
Re: Stock Exhaust Performance Mod [Re: Skeerman] #36037 07/26/08 08:57 PM
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daleCarlsbad Offline
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 Originally Posted By: Skeerman
So who has done this on a new 250? I am in the process if trying to get it done and I am running into a few hickups.I bought an extension that won't fit in my drill and I bought a metal hole saw that wont fit in my extension. SOOO.... I am going to buy the biggest longest bit I can and then use a tapered bit to grind out the hole lie z1 did. Do I need to woory about the shavings or are those going to blast out the end like I am hoping they will? Thanks!


I just did the exhaust mod on the wife’s 08 XT250. It really improved the acceleration and the bike can now pull easily up to and past 80 mph. The bike is a bit louder while on the gas, but not too load, as I am not into the loud pipe stuff.

I took the end cap off, using an impact wrench which will ensure you get the screw loose and will not strip the Phillips head. A bit of liquid wrench to loosen the cap, then wiggle the end cap off. You can also insert a large screw driver into the hole which allows access to the Phillips screw….and use a small block of wood to pry against…..and the end cap will pop right off.

Next look down the pipe and about 8 inches down….you will see the plate at the end of the cylinder inside the pipe that is blocking the exhaust flow. Some folks drill a few holes in it, but I used a 1 7/8th inch hole drill bit and removed the entire plate. Then just put the end cap back on and the mod is done.

Also, I took the plastic cover off of the top of the air box that holds the filter in. I fabricated a small length of aluminum to hold the filter in and used the existing screw to secure the plate to the air box.

I can’t provide photos now as am out of town.


daleCarlsbad
Re: Stock Exhaust Performance Mod [Re: daleCarlsbad] #52225 08/25/09 02:07 PM
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Remi Offline
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Is the bike still running well, does it seem to need to be rejetted? Curious yet nervous at opening my 09 up without the availability of the pilot jet.


2009 XT250
Re: Stock Exhaust Performance Mod [Re: Remi] #52303 08/27/09 07:47 PM
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BrandonM7 Offline
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Originally Posted By: Remi
Is the bike still running well, does it seem to need to be rejetted? Curious yet nervous at opening my 09 up without the availability of the pilot jet.


We did my father's '09 Tuesday night, along with making an additional hole in the airbox lid (dremeled a similar-sized hole right beside the stock hole.) It sure is a lot louder. He says it's stronger, but I haven't ridden it yet to get my take on it.

Why is the pilot jet unavailable? I thought I read on here (somewhere) that the small Mikuni jets fit this carb (even though it isn't a Mikuni carb.)


KTM 400 EXC
Street legal, sometimes 'tarded
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