Author Topic: Lost builder (Read 9419 times)

tlr7272 · « **Reply #15 on:** November 28, 2014, 01:17:55 AM »

so will it b a good woods bike with just esr mx ported cylinder,38 mm carb with vforce 3 and dyna cdi box and fatty fmf w fmf silencer, 450 shocks on front............the one thing I know it will b reliable and should keep up with pipe 450s in the woods........I hope.. ok so tell me do I want powervalve?? stroker, welded crank? what kind of cylinder like I said I don't need that wide open desert hp I just thought 50hp was realistic my friend swears his 450rputts 50 dowb and bhe only has hrc kit he claims.......thisb is my first project so if something id
s dumb as hell its just someone wantinh to learn .................thank u udontknowme

tlr7272 · « **Reply #16 on:** November 28, 2014, 01:22:49 AM »

I understand that ,,,,but if I know something and someone is asking question and I know I can help him I WOULD ITS FREE IT DONT COST ME ANYTHING TO POINT SOMEONE INTHE RIGHT DIRECTION........... but I guess knowledge is power and it goes to ur head cause I guarantee he asked questions even if it was 20 years ago...........I guess to each there own I woulg tell it like it is...................

mennis1971 · « **Reply #17 on:** November 28, 2014, 10:30:27 AM »

I don't see what the problem is, EXCEPT that a 50hp woods friendly OEM 250cc jug pump gas motor isn't possible. I have a 50hp oem jug and it isn't a woods motor. It's a peaky screamer(and was built to be that-no it's not a drag motor btw). Everyone here has no problem sharing info btw.
To get that kind of hp out of a stock jug, EVERYTHING must me matched up to compliment each other and not just a pile of parts thrown together.
The other thing I think you're leaving out of all this is the rider. IDK how well you can ride, but the rider will be one of the most important parts of this machine. A great rider can easily overcome being down a few hp by riding both harder and smarter.
I'm sorry if you didn't like the answers that others have given you, but they are honest answers. Would you rather have a builder lie to you and then be disappointed?

Tbone07 · « **Reply #18 on:** November 28, 2014, 10:51:12 AM »

You'd have to be an excellent woods rider to keep up with built 450 quads on a stock 250r cylinder. You would have to ride virtually mistake free.

You need to go to a 330cc or bigger cylinder, depending on how much you weigh and your skill level

Jerry Hall · « **Reply #19 on:** November 28, 2014, 11:56:33 AM »

A stock off the show room floor TRX450 will make 36 to 37 hp to the rear wheels on my dyno. Remove the air box lid and rejetting the carb will raise the power to 38 to 40. Add the best exhaust pipe and muffler on the market to the stock engine with the air box lid removed and the pipe will add another 1 to 2 hp. Now install the full HRC kit to the engine with the air box lid removed, the best pipe and muffler and now the kitted motor will make 43 to 45 hp on my dyno. Do the correct things to the ports, valve seats, and valves and now the 43 to 45 hp package will make 49 to 50 on my dyno making 8 to 10 second long dyno runs.

An off the show room floor YZF450 Yamaha starts off at 37 to 38 and responds very similar to the same modifications/external bolt ons as the TRX450, but will end up at about 46 with the air box lid removed, rejetted carb, best pipe and muffler on the market, and exhaust cam retarded 1 tooth.

A LTR 450 Suzuki off the show room floor will make 40 to 42 off the show room floor and make 48 with the air box lid removed, best pipe and muffler, and the fuel map re-mapped.

four-strokes typically have a higher power average over a wider RPM range than two-strokes. It will typically take a 53 to 55 plus peak hp two stroke to beat or run equal in a drag race to a 50 HP four-stroke.

I cannot say your engine will not make 50 hp on someone elses dyno without knowing their dyno testing procedures, type of dyno, what was done to the ports, combustion chamber and what pipe they were using. I can say it has been my experience that I have not see a 50 hp 250 on my dyno that I would consider to have the shape power band that I would consider to be good for woods riding.

We dyno a lot of ATVs, UTVs, motorcycles and street hot rods where the owners are really disappointed with their recent vehicle purchase, or their self selected mail order engine components or some professionally built engines. Talk is cheap in the forums, advertisements and bench racing sessions. The race track, or dyno and or lining up side by side will reveal the truth.

udontknowme · « **Reply #20 on:** November 28, 2014, 02:55:00 PM »

i think if i were you i would look into a 72 bore puma. take your oem crank and weld the tins on. i dont see how you could go wrong with this setup and it wouldnt cost all that much

fearlessfred · « **Reply #21 on:** November 29, 2014, 07:21:53 PM »

I have seen certain builders claim to make big numbers but would not put much trust in people that have to toot their own horns constantly. Jerry and others have taken time to give good and honest advise. I value this and you should also.

udontknowme · « **Reply #22 on:** November 29, 2014, 07:33:34 PM »

ya seems like dyno keyboard racing is all to common anymore. banshee sites are the worst :glee: