White brothers exhaust trx300
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I have a 94 TRX300FW and curious about the comment you made about re jetting and the 88 cam. I did a rebuild on mine and installed a different cam out of an 85 250 3 wheeler I believe, Fishfiles posted on my build thread and gave some advice on it, so I'd have to go back and look to see exactly what it was. My question is : what cam are you referring to, what exactly does it do and can you elaborate on the jetting? Mine had a crappy China Ebay carb on it and I couldn't get it to run worth a hoot so I found an old factory one and rebuilt it with a Shindy kit and it made all the difference in the world! If I can get more power re jetting without it causing overheating issues or any other problems, I'd definitely like to do it. I appreciate the info Cool.
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38,589 Posts
and your not going to notice that much difference with just a jetting. trx300fw's are NOT speed demons..never have, never will be.
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114 Posts
The truth is lol, is that even though i'm prepared to put the '88 300 cam in mine I still haven't. (it comes from a 1988 fourtrax 300). The cam will add high-end power and a little more power output overall. Some say they lost low end doing it, some say it's just better. I need to find out myself. BUT I installed this white bros exhaust and rejetted with a dynojet kit using the 124 main. I advise you do the same. You CAN get more power rejetting. Infact, the difference it made on mine was more than just a tiny bit, (contrary to the naysayers on here who claim to know all and seem to be doubtful of little things like this.) It does give you more power and make it snappier. After changing the jet to what dynojet says, I found that the air/fuel mixture screw position ran too rich, so if you mess with that and get it right you will get a boost. This is what I have been doing the past 3 days and I am much happier with it. Find out the truth yourself. The jet size and air/fuel mixture is key.
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114 Posts
Who knows what would happen to his? Mine made a difference. No, you probably won't get anything if all you do is rejet without adjusting and getting everything dialed in. I decided to find out myself after putting it off because I was told none of this would do anything. And I guess I learned a lesson. I know whats best for my bike and i'll think for myself from now on about it.
If you're happy it's your bike, but if it was that simple to get more power they would have done it from the factory. I think you have the "I just tinkered on my engine so it feels faster" feeling. In reality, probably no difference. Been there, done that. Kinda like when I cut a couple of coils off the spring on my 09's carb slide.
"WOW, I can feel a HUGE difference."
Then when I bought another bike, exactly the same, I realized that the power increase I thought I got was all in my head.
Buddy bought an 06 that was jetted with an HMF. He talked about all the power it had with the HMF and jet kit. I put him on my bone stock 06 that was exact same bike. He rode it a bit, ate some crow, took that loudener off his bike and sold it, put a stock muffler on his bike.
"WOW, I can feel a HUGE difference."
Then when I bought another bike, exactly the same, I realized that the power increase I thought I got was all in my head.
Buddy bought an 06 that was jetted with an HMF. He talked about all the power it had with the HMF and jet kit. I put him on my bone stock 06 that was exact same bike. He rode it a bit, ate some crow, took that loudener off his bike and sold it, put a stock muffler on his bike.
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114 Posts
But it didn't come from the factory. It's actually 26 years old. Now, I have done that before. I know you'd like to call me ignorant, but i'm afraid this isn't the case. I wouldn't have gone out of my way. Here's what i'm talking about; There is both a 1986 trx 350 foreman and a 1993 fourtrax 300 at my grandparents farm. The 350 has always triumphed over the 300 in every way and blown it away in drag races. Because we noticed such a difference after changing the exhaust and rejetting right, we did a drag race again. What happened this time was that through the first 4 gears the 300 stayed ahead with the 350 right next to the bottom half of the 300. Then, once we hit 5th gear the 350 slowly passed it. Both bikes were both running as good as they do, especially the 300. That was what amazed me. I could already feel there was a difference, but once we did that I KNEW there was a difference.
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1,759 Posts
Most loud exhausts do flow better especially the full system. There is a small low rpm power loss but if jetted properly all "low performance" four strokes make better power with a louder exhaust. The trick is to rejet with a larger main and perhaps the needle. The ones that don't rejet will probably find an actual power loss........it just sounds faster.
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4,390 Posts
The reason most people will take the "nay sayer" stance on this matter is because for every one of you there are 50 dudes that will just remove the baffle on there quad and claim it makes all this power difference. When in reality they just made everyone around them 100% more annoyed. We legit re-packed one of the guys that rides with us exhaust for our own sanity. But a good performance exhaust system with jetting and preferrably a good high flow intake system or filter atleast and you just did the "ricer tune up kit". It will make a power gain and a noise gain aswell. Period. It will. Say what ever you want but an engine is an airpump. The more air you can take in or get out means you can flow more which is a bigger bang which is more power. My .02
I realize that a better breathing engine will produce more power. My point is, simply dumping more fuel and adding more flow to the exhaust doesn't change the fact that the rest of the engine hasn't likewise been modified to realize the benefits of those components.
I put a $500 Borla stainless header on a Jeep 258. Made very little difference. Yeah the exhaust has the capacity to flow better, but the stock head on a 258 doesn't allow the benefits of a higher flowing exhaust. If you want power out of a 258 you have to swap to the high output head from the later 4.0 inline 6. Otherwise the design of the head keeps any bolt-ons from getting you any real power increase.
You're dealing with a single cylinder Honda engine with a stock head? Perhaps it wasn't tuned right before you started, but slapping a muffler and a jet kit on a stock Honda motor isn't going to do much, if anything except make your wallet lighter.
But I'm sure ya'll know better than the Honda engineers who mated up a particular exhaust, head, carb, etc right?
I put a $500 Borla stainless header on a Jeep 258. Made very little difference. Yeah the exhaust has the capacity to flow better, but the stock head on a 258 doesn't allow the benefits of a higher flowing exhaust. If you want power out of a 258 you have to swap to the high output head from the later 4.0 inline 6. Otherwise the design of the head keeps any bolt-ons from getting you any real power increase.
You're dealing with a single cylinder Honda engine with a stock head? Perhaps it wasn't tuned right before you started, but slapping a muffler and a jet kit on a stock Honda motor isn't going to do much, if anything except make your wallet lighter.
But I'm sure ya'll know better than the Honda engineers who mated up a particular exhaust, head, carb, etc right?
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114 Posts
Honestly sounds like you just want to be right as its stalemate now. First the story was "you're not going to get any more power" but more air and more fuel will give you more power and we all agree. The argument that Honda would have done this in the factory already is absolutely false. Maximizing speed and power with fuel and air wasnt their priority. Infact, the size of the jet that should be used also depends on your height above sea level. And honda would need to have a balanced medium with their jet so it works everywhere. Honda wanted to make their machine reliable as can be and would never place an easy 2hp increase over that priority anyway. We dont have to know better than the professionals who created the fourwheeler to know more fuel+more air+more burn=bigger bang
OK man. If you want to think that slapping a muffler and a jet on a single cylinder Honda engine with NO engine modifications gives you more power, go right ahead.
You should get one of those magnets that attaches to your fuel line too. I hear they give you 312% better MPG....
You should get one of those magnets that attaches to your fuel line too. I hear they give you 312% better MPG....
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114 Posts
It's funny because you're beating a dead horse of an argument. I already demonstrated how I know theres a difference, and by rejecting that you're wrong. So you can tell me about how I'm wrong after you come here and undo and redo what I did to my atv
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Here is the one and only thing your missing in the argument. The reason honda did what they did is because it was safe and met emissions standards. Every engine is entirely different. Some may have a good exhaust design right out of the box. Alot of times on car engines and truck engine the only way to flow exhaust better is long tube headers. Shorty headers are 100% the same flow as stock. But this is getting alittle heated fellas. Lets keep the 3rd member measuring to a minumum please.:grin
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All the factory machines are choked up a bit on the exhaust and intake, I’ve seen very few machines that haven’t benefited at least somewhat from an exhaust and aftermarket air filter, and of course either a tuner or rejet of the carb. Will it make a bigger difference with internal mods, absolutely. But don’t think that with a stock motor it will do nothing. The real question would be are the gains worth the cost? Because on some of the newer machines where you cannot get a simple slip on anymore plus with EFI, your some serious cash for what is honestly pretty minimal power. But I think the OP is talking about a 300 here, really haven’t read the whole thread sorry....
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