SO just got a 05 trx450 and.... QUESTIONS

1585 Views 18 Replies 7 Participants Last post by hondaman01, Oct 3, 2008

dragit

Discussion Starter · Sep 26, 2008

Alright. So I had a 500rwhp turbo trans am and couldn't afford to keep it up. So I traded the car and got some cash on this quad (and a few new parts for the quad that it needs).

Now im VERY dissapointed in it compared to my yfz... My friend has a 06 yfz with a Lexx slip on, cam mod, and been jetted. He weights in at 300lbs and im about 140-150 and he puts a good quad on me every drag. If we switched quads it was bad... Me putting like ten quads on him with the front wheels off the ground. But there are a few things on the honda that prolly needed to be addressed.

I dug into it and found that basicly this thing was not very well kept (not by the guy i got it from, but the one he got it from). After
seeing the air filter, fricked up motor mount bolt, and some dirt in the intake (may have been me removing the filter but dunno), I decided I would do a compression check and do the valves on it before I beat on it anymore. ALso found the carb on the engine side was not THAT tight...

Well the guy I got it from told me he has two big bores with very low miles on em and I can choose one to take with it. So My question is what one to go with. One is like a 480 with a higher compression piston (like 14:1) and stock jug bored. The other is a 500 cc with a aftermarket jug and lower compression (like 12/1).

The quad already has a full FMF exhaust on it and I just put in a fuel screw. I just need to know what big bore will give me a good combination of power and reliability. Also looking at what cam to buy for it also (this being the one thing money wise coming out of my pocket).

Please give me any helpfull tips on which way to go, and what kinda jetting I will be lookin at (at my 5000 foot elevation).

I really dont wanna be dissapointed with it when im done. I want it to run like a big bore bad quad and the yfz only have dreams of hanging with a person of the same weight on it. Thanks guys!

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1 - 19 of 19 Posts

jwilson84

· #2 · Sep 26, 2008

It really is a combination with these machines, the yfz with cam mod is a good runner

what kinda jug? with the after market one, it really depends if ya wanna run race gas or pump gas, the high comp 480 isnt gunna be to far behind the 500cc low comp, with either one of them size bores ud be good with a hc2 or a hc3

dragit

Discussion Starter · #3 · Sep 26, 2008

It really is a combination with these machines, the yfz with cam mod is a good runner

what kinda jug? with the after market one, it really depends if ya wanna run race gas or pump gas, the high comp 480 isnt gunna be to far behind the 500cc low comp, with either one of them size bores ud be good with a hc2 or a hc3[/b]

WEll if the 500cc is gunna be ahead (faster) it would make sence to go that route wouldn't it? With the lower compression you could
still run pump gas yet still be faster? I figured the lower CC/more compression would be faster and rev quicker (it revs slow as hell as it is, but could be jetting). And i see overheating being less of a issue with the aftermarket cylinder. Im not sure on the details
of the jugs. I wanted to ask you guys before I went and looked at them.

Also, what kinda mods can i do to the stock intake?? That is a cluster fvck and I just dont see the need for stuff like the lil box deal off to the left side on the intake tube in between the filter and carb...

Thanks for the input man!!

jwilson84

· #4 · Sep 26, 2008

Most people think the stock intake on the 06 up is actually pretty good, im not really sure, my freind has a pro design intake on his 07 and it seems to work very well,

spktho

· #5 · Sep 26, 2008

The Fuel Customs Intake is good for the 04-05's. You can still use the box, just have to mod it some or run it without the box.

You should definitely look into getting the head ported for the big bore and especially if there was dirt getting into it to f'up the valve seats.

mx333

· #6 · Sep 26, 2008

i would get the bigger cylinder and get a stage 3 cam and have your head ported should be a good runner then

quadforce*com

· #7 · Sep 26, 2008

what year bike do you have ?

sandshots

· #8 · Sep 26, 2008

to begin with i bet your bike is in bad need of a valve adjustment.

to get one of those big bore kits to work well youll have to get the head ported.
the hc stage 3 is a drop in cam and will work well.

dragit

Discussion Starter · #9 · Sep 26, 2008

to begin with i bet your bike is in bad need of a valve adjustment.

to get one of those big bore kits to work well youll have to get the head ported.
the hc stage 3 is a drop in cam and will work well.[/b]

Honestly I'll put the big bore in and cam, jet it and if im not happy with it i'll trade it off for a stock 06+ yfz. Im really excited about the new yfz450r (i'll jsut do a high compression piston in a yfz.).....

But i'll give the ole honda a chance yet. Only gunna cost me like $250 to do what im doing so mise well give it a run and see if it runs good or not.

sandshots

· #10 · Sep 26, 2008

index.php?act=findpost&pid=563035

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to begin with i bet your bike is in bad need of a valve adjustment.

to get one of those big bore kits to work well youll have to get the head ported.
the hc stage 3 is a drop in cam and will work well.[/b]

Click to expand...

Honestly I'll put the big bore in and cam, jet it and if im not happy with it i'll trade it off for a stock 06+ yfz. Im really excited about the new yfz450r (i'll jsut do a high compression piston in a yfz.).....

But i'll give the ole honda a chance yet. Only gunna cost me like $250 to do what im doing so mise well give it a run and see if it runs good or not.
[/b]

fine tuning will play a huge role. i suggest gettin it on a dyno to get all u can

dragit

Discussion Starter · #11 · Sep 27, 2008

index.php?act=findpost&pid=563134

Click to expand...

to begin with i bet your bike is in bad need of a valve adjustment.

to get one of those big bore kits to work well youll have to get the head ported.
the hc stage 3 is a drop in cam and will work well.[/b]

Click to expand...

Honestly I'll put the big bore in and cam, jet it and if im not happy with it i'll trade it off for a stock 06+ yfz. Im really excited about the new yfz450r (i'll jsut do a high compression piston in a yfz.).....

But i'll give the ole honda a chance yet. Only gunna cost me like $250 to do what im doing so mise well give it a run and see if it runs good or not.
[/b]

Click to expand...

fine tuning will play a huge role. i suggest gettin it on a dyno to get all u can
[/b]

Well i do live in po dunk Casper, Wy and there is no place to put it on a dyno. So i will have to do it by feel and plugs since there is no way to get my wideband on it easily really. Seems my buddy's yfz ran well with tuning off of feel...

Looks like I may go with the 480 since the 500 turns out to be even lower compression than 12/1 and so i figure it has got to be a pooch. That and I can use stock gaskets with the 480.

So hot cam 3 sounds like the ticket. will get it on the way with some shims. Now what should I be looking at doing for jetting to start with?

AND IF IT MEANS ANYTHING, my buddy has a brand spanking new trx450r that is bone stock and runs jsut the same as the 05 I have. :thumbdown:

jwilson84

· #12 · Sep 27, 2008

stock to stock the new quad will be faster then ur 05, the 06 n up have more compression, better carb,

dragit

Discussion Starter · #13 · Sep 27, 2008

stock to stock the new quad will be faster then ur 05, the 06 n up have more compression, better carb,[/b]

I just dont know why honda would build a quad that aint even slightly competitive in power with the Yamaha.

I'd have to say my 04 yfz ran similar to this 05 trx... but the 06+ yfz's are animals .......

jwilson84

· #14 · Sep 27, 2008

there really close stock to stock, yfz vs honda, it just seems that the yfz comes around alot quicker, like faster with less money

dragit

Discussion Starter · #15 · Sep 30, 2008

So anyone have any jettin tips? like a good general area to start from for the 500cc bb and a stg 3 hotcam??

dragit

Discussion Starter · #16 · Oct 3, 2008

K i got my big bore today. It is a 500cc Wiesco kit. I ordered the Hotcam stg3... and im thinking about trying to pawn off my fmf system on a friend with a 08 and getting me a Rossier setup.

Still up in the ait on what jets to try first, but at this point since our altitude is so high I suppose i'll start with whats there and try to clamp my wideband into the slip on.

Anyone else have any helpfull advice?? Also! The big bore has about ten hours on it, and im debating on buying new rings or not for a safety margin. And will I be able to see excessive valve wear without actually removing the valves from the head??

THanks again.

hondaman01

· #17 · Oct 3, 2008

IMO your not gong tog et the performance your looking for without some headwork

AND with some headwork and a BIG FCR carb and a good intake that 04 500cc will put a hurtin on a fully built 06 any day of the week

dragit

Discussion Starter · #18 · Oct 3, 2008

IMO your not gong tog et the performance your looking for without some headwork

AND with some headwork and a BIG FCR carb and a good intake that 04 500cc will put a hurtin on a fully built 06 any day of the week[/b]

lol well that's bad news and good news... Only looking to out run a cam modded/slip on 06 yfz... well... now he has a raptor with a high comp piston and lots of tuning.... But either way...

Looks like head porting is a good chunk of change... like $600++??

hondaman01

· #19 · Oct 3, 2008

index.php?act=findpost&pid=566401

Click to expand...

IMO your not gong tog et the performance your looking for without some headwork

AND with some headwork and a BIG FCR carb and a good intake that 04 500cc will put a hurtin on a fully built 06 any day of the week[/b]

Click to expand...

lol well that's bad news and good news... Only looking to out run a cam modded/slip on 06 yfz... well... now he has a raptor with a high comp piston and lots of tuning.... But either way...

Looks like head porting is a good chunk of change... like $600++??
[/b]

ill send you a pm on that one lmao

its not just the head porting thats gong to help the 04-05 bikes have weak stock intake valves, they are probably wore out and need replace and since youve got to go that far into the head might as well get that sumbitch ported, you know waht i mean?

a good ported head will add up to 10hp on some builds, so its worth it

1 - 19 of 19 Posts

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