Weight plays a big factor when you talk performance, Based on the raw data i see no reason why this rig won't smoke a 350X. I'm guessing it may even give a stock 250R a scare.Originally Posted by torker
Got The Holeshot
Arm chair racerJust too addicted
Weight plays a big factor when you talk performance, Based on the raw data i see no reason why this rig won't smoke a 350X. I'm guessing it may even give a stock 250R a scare.
My toys 85 KXT250A2, 85 ATC250R, 85 Tri-z 250, 06 LT-R450, 04 YFZ450S, 07 125 typhoon x 3, 06 FPV GT.
Power User
Roostin Away
IIRC a stock 85-86 R was rated at about 30hp and I'd bet the power that 4 stroke makes is over a larger RPM band so it'll probably spank a stock R.
1985 Eddie Sanders ATC330r
1986 Monstecate
1984 ATC70 (awaiting 125cc transplant)
1984 ATC125M
1986 GSXR 750 - Keepin' it old school!
1999 Arctic Cat 500 4x4 plow machine
1999 Arctic Cat Thundercat 1000 (lake lizard)
1996 Arctic Cat Jag 440 L/C (ditch banger)
Just Too Addicted
Arm chair racerJust too addicted
I'm really hopeful it will be a good bike when done. I looks like it has better ballance and one can tell it weights a lot less when you're handling the bike and moving it around.
Today there was a lot of progress. The front, lower engine mount was done and so was the front brace by the engine mount. We did it at my friends shop. All the work we went to do is not done just yet, I'll be picking it up on monday. By then all engine mounts should be done and the radiator mod should be completed. Also the kick starter will be finalized.
I'll be posting pics then. Keep watching as I move forward with this and bring my 86' ATC 250RF, a little bit, to more modern times, with newer parts. To tell you guys I'm very, very anscious will be an understatement.
Thanks to all for the good words and encouragement I have recieved.
TORKER.
THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...
Power User
Roostin Away
This is a great build Torker!!!!can't wait to see how it turns out but is it only me who thinks this engine might not have enough torque??? the main reason the engine is so much lighter is because the crank is alot lighter .....crank weight (to a point) equals torque and HP and adding a bigger flywheel only helps a bit not the same as a bigger crank though???? the KXF 250 weights in at 231lbs and a 250R weights 291lbs thats 60lbs difference???
Need Honda ATC TRX NOS restoration parts??? or come check out our ATC brochure site
www.offroadvintage.com
Power User
Got the holeshot
Imo, this will probably be close to a stock R, how ever it will be ate alive by a slightly modded R. But that is not the point, I think this would be a great xc/mx bike.
Power User
4 Wheels? Huh?
do you have to come in to every thread and run your mouth about a 2 stroke.
Great build Torker. I share that affinity for the new kawis. After you get it mechanically done you can revamp the suspension and so on. Should make for a fun ride for sure.
Last edited by Louis Mielke; 02-23-2010 at 06:03 PM. Reason: uneeded text
At The Back Of The Pack
Arm chair racerAt the back of the pack
I am guessing that their will be more weight savings than just the motor. My 450 will spank my trx250r, but very hard to get a good launch, the front end just lifts and keeps lifting no matter if you shift or not you have no choice but to get out of the throttle. I see no reason why this build would have any problems beating a stock or slightly modded 250r.
2005 CRF450R Alum Frame build done, switching to inverts.
86 trx250r fmf fatty fmf q k&n v force reeds gold valve rear shock with eibach spring.
86 atc250r stock sand only
88 NX250 mint rainy day
85 kawi js550 stand up basicly stock
87 kawi js550 scary fast for a stand up
Power User
Got the holeshot
excuse me? I don't really care about your opinion and the fact that you have spent a fortune on something that a 250r will beat stock. Hell, this 250 four stroke will eat your "3 fiddy x" in any riding condition. Why is it you called me out instead of the other people that said the same thing?
I actually like this build, and it has nothing to do with 2 stroke vs. 4 stroke.
"edit"
Sorry torker.
"mod edit"
nice try but not enough. please watch it.
thank you - Louis
Last edited by Louis Mielke; 02-25-2010 at 04:42 AM. Reason: unnecessary language
Got The Holeshot
Arm chair racerJust too addicted
Easy Boys this is a really great thread, lets not screw it up.
Have you got some photos some more photos yet Torker?
Do you think you could do me a favour and do some quick dimension of the KX250F donk. like the overall height, overall width, the width across where the swingarm bolt goes, and the diameter of the swingarm bolt.
I'm seriously thinking about doing this to my Tecate, but I don't want to cut up the frame to do it.
My toys 85 KXT250A2, 85 ATC250R, 85 Tri-z 250, 06 LT-R450, 04 YFZ450S, 07 125 typhoon x 3, 06 FPV GT.
At The Back Of The Pack
Arm chair racerAt the back of the pack
I agree calm down its from how I read it he wasnt actually saying anything about a 2 stroke being better than 4. But like he said a mildly built 250r probably can beat it in drag, but trail/mx is different world. The main issue I see him having here is that the tranny on the kx is geared quite a bit higher than what you would want for the sprocket and tire size that we use on three wheelers, way larger rear sprockets on a dirt bike along with taller tires allow it to be gear quite a bit lower. But it should still be a good performer with power all over the place, mine is a little bit tricky to start moving as far as clutch control, but not horrible once you get used to it from there its a torque monster.
2005 CRF450R Alum Frame build done, switching to inverts.
86 trx250r fmf fatty fmf q k&n v force reeds gold valve rear shock with eibach spring.
86 atc250r stock sand only
88 NX250 mint rainy day
85 kawi js550 stand up basicly stock
87 kawi js550 scary fast for a stand up
Power User
Roostin Away
The larger tire diameter should counteract the larger sprocket size and vice versa. I can't wait to see this finished. It makes me want to shoehorn a 450 into my spare 350X frame.
1985 Eddie Sanders ATC330r
1986 Monstecate
1984 ATC70 (awaiting 125cc transplant)
1984 ATC125M
1986 GSXR 750 - Keepin' it old school!
1999 Arctic Cat 500 4x4 plow machine
1999 Arctic Cat Thundercat 1000 (lake lizard)
1996 Arctic Cat Jag 440 L/C (ditch banger)
Just Too Addicted
Arm chair racerJust too addicted
It's cool. Let's just keep our eyes on the ball, shall we.
TORKER.
THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...
Just Too Addicted
Arm chair racerJust too addicted
I have not had a chance to pick it up yet, it's still at the shop. But work has been completed as far as engine mounts and radiators go. The swingarm bolt hole it's the same diameter as a TRI-Z, that one fits great. For the R, I has to build bushings to get the swingarm bolt to fit snugly. They were made out of stock blaster/banshee A-Arm bushings and modified accordingly. I'll be changing those at a later date from plastic to bronze. The swingarm was also modified slightly on the left side so the sprockets lined up. It was easy with a grinder and some new delrin bushings I got from ?, sorry forgot his name, but I run his swingarm bushings on all my R's. Also a Chro-Mo spacer was made on the right side of the engine, where the swingarm bolt goes thru to take up that space.
I'll get measurements when I pick the trike up. I just have to pay the guy, you know. I'll also post some pics for ya.
Well, I had to cut the frame on the left side and a different bend Cro-Mo tubbing made to let the engine drop to its right place. I have not had a Tecate in years, so I don't know how it will fit on that particular frame.
Keep looking, I should have something in the next few days. Hopefully I can sell what I have left from the Z to keep financing this build. Help me out!
TORKER.
THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...
At The Back Of The Pack
Arm chair racerAt the back of the pack
The larger tire diameter does make up for the gearing a little. On my crf450 conversion the largest rear sprocket that I am able run while retaining the skid plate is a 39 tooth. The crf runs a 51 tooth rear sprocket, this 12 tooth difference is huge. Mine had all kinds of torque and will lift the front end in any gear, but from a stop it is hard to move with out either slipping the clutch like crazy or spinning the tires. My buddy tried to move it last time at the dunes over to my toy hauler and killed it 4 times, and he is by no means an amateur. I have no doubts that this will work, just will be alittle bit tricky on the low end of first gear. On a three wheeler the ground clearance just doesnt allow you to run a large enough sprocket on the rear. On my 450 I am running the smallest counter sprocket possible while still clearing the trx450r swingarm. This is a great project and I am sure that it will turn out amazing judging by how it has progress thus far.
2005 CRF450R Alum Frame build done, switching to inverts.
86 trx250r fmf fatty fmf q k&n v force reeds gold valve rear shock with eibach spring.
86 atc250r stock sand only
88 NX250 mint rainy day
85 kawi js550 stand up basicly stock
87 kawi js550 scary fast for a stand up
The purveyor of "Plan B"
Teaching quads a lesson
I'm seeing some great self moderation in this thread which is appreciated but I do want to chime in here. I really don't want to go through and clean out or lock this thread because its a really great build. If you want to argue about stock to stock, bikes to bikes, engine to engines, my dads badder than your dad then please do so in chat or in the vs. forum. Strong language will not be tolerated anywhere on the board. Discussion is one thing but lets not fight like teenagers.
This message will self destruct in a few days after its sunk in. No need to leave it here permanently. Thank you everyone.
"Yes its broken, but does that really surprise you?."
"What happened? What does it look like happened?!?!"
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