Planet Minis

Coole · 10-18-2009, 12:58 PM

Hey everyone!
I am going to use a Honda CRF100 engine for roadracing. It has a Kitaco inner rotor ignition, 120cc BBR motorsports kit, K&N HA-1088 air filter, FMF Powercore 4T exhaust and a pd22 replacement carburator by RT.

Now because the engine is originally made for off-road use the top speed is not very high. Does anyone have an idea on how to get the topspeed up? I would really like to get it to like 65+ mph.

rc164racer · 10-18-2009, 01:01 PM

Takegawa sport touring tranny. Gonna be hard to find someone to order it for you and might be pretty pricy but that will put you well over 75mph if you have enought power.

Coole · 10-18-2009, 01:09 PM

Actually the Takegawa transmission is really REALL expensive

. I found it for $940 and that's like way to much! But if the transmission is really that important, won't a Honda CB100 transmission fit? That's a roadbike, so it probably has a different transmission.

firepower354 · 10-18-2009, 01:41 PM

CB100 trans is different, and in the series with the old 125/175/185/200 engines. Your 5th gear is a .92 overdrive already, anyway. Your easiest method is sprockets, up in front and/or down in back. There's also the $255 clutch basket and primary gear, that raises overall gearing by 17% or so. Speeds up the clutch, reducing torque load on it. Not sure on the Tak, but the stock trans ratio drops are 39/26/19/19%, while the 80 bolts in and is 30/23/19/15% gearing drops. Tightens things up a bit.

Try calculating the RPM you're using now. The 45mm stroke XR doesn't mind a little buzzing

The BBR cam is way too small, and the head needs some work to really zing. A bigger carb isn't a bad idea, either. Web 69/68 or 69 grind, with matching springs and retainers will add a bunch on top.

Coole · 10-18-2009, 06:43 PM

Thanks for all the replies so far! I am really starting to get an idea of all the possibilities I have!

But what does "Web 69/68 or 69 grind, with matching springs and retainers" Mean? Sorry for not understanding this, I am Dutch you know!

gman · 10-18-2009, 07:10 PM

Performace camshaft and valve springs

Web Cam Inc. - Performance and Racing Camshafts

Coole · 10-19-2009, 10:40 AM

Okey thanks for all the replies so far!

I think I am going to buy a Web 69/68 with matching springs and retainers and new sprockets. Any tips for the sprockets?

Now I would really like to know what my topspeed will be with this parts installed!

tmoney745 · 10-31-2009, 11:27 PM

i have super tall gearing on my stock motor.and it goes about 70mph.put a 15 on the front.and i went with the smallest sprocket i could find for the back.

fireman_343 · 11-04-2009, 06:11 AM

I've got a NSR/NSF that I roadrace with a CRF/XR100 motor with BBR120 kit, 69 grind Webcam, lighter flywheel, kitaco cam chain, 24mm round slide kehin carb, etc.. and I gear it for the long tracks I race at. 16 front with 38 on the rear.
The major draw back with these motors (like said before) is the head. Get a super head and that will really wake up the motor. Also, the a oil cooler will help keep things cool when running that sucker at top speed, but you don't have the bodywork around the motor like I do, so it shouldn't be too much of a problem. If you find that the power starts to "fade" after a while, then you'll want to look into an oil cooler setup.

Coole · 11-04-2009, 11:08 AM

Hey!
I can't find a front sprocket any bigger than 15 tooth! And the smallest rear sprocket I could find was only 40! That's why I would really like to know where you bought your sprockets!

And the Kitaco cam chain, what is that for?

By the way, what is your top speed now?

Thanks for the replies so far, they're very useful!

slow600 · 11-11-2009, 09:23 AM

convert to a 420 chain, much easier to find front sprockets.

fireman_343 · 11-11-2009, 07:26 PM

Yeah.. sorry.. I assumed that you were running a 420 chain. Swap to a 420 and you'll find all kinds of sprockets! My rear sprocket is different then yours since I race a NSR/NSF

As far as my top speed.. I have no clue?? But, you can kinda see in this video of how fast I go against some of the KX65's.. This was a race at one of our short tracks. We race at BeaveRun in PA and I ran a 16 front and 38 rear

I'm on the red GP style bike on pole at the start of the race...
OYL MiniGP Race Circleville, Ohio Sunday Sept. 13 video by Jaymz996 - Photobucket

-Brian
www.teamquazzymoto.com # 4

hammer_213 · 11-11-2009, 08:45 PM

nice vid dood ...good racin

PitRacerVince · 11-12-2009, 01:16 AM

Quote:

Originally Posted by fireman_343

I've got a NSR/NSF that I roadrace with a CRF/XR100 motor with BBR120 kit, 69 grind Webcam, lighter flywheel, kitaco cam chain, 24mm round slide kehin carb, etc.. and I gear it for the long tracks I race at. 16 front with 38 on the rear.
The major draw back with these motors (like said before) is the head. Get a super head and that will really wake up the motor. Also, the a oil cooler will help keep things cool when running that sucker at top speed, but you don't have the bodywork around the motor like I do, so it shouldn't be too much of a problem. If you find that the power starts to "fade" after a while, then you'll want to look into an oil cooler setup.

no one will say it but hondas always have very limiting heads, but solid design... I had to say it nicely to not offend anyone lol

fireman_343 · 11-12-2009, 08:10 AM

Didn't offend me.. That is the only thing I don't like about my motor in the bike.. the head is what holds back all the power. But.. for reliability and what not.. stick with the stock head. The CRF/XR100 motors are bullet proof in stock form and even with mild mods.

crf50luke · 11-12-2009, 08:44 AM

Quote:

Originally Posted by fireman_343

Didn't offend me.. That is the only thing I don't like about my motor in the bike.. the head is what holds back all the power. But.. for reliability and what not.. stick with the stock head. The CRF/XR100 motors are bullet proof in stock form and even with mild mods.

i hav to agree. like look at the crf450 it only has 1 cam and suzuki kawi yamaha ktm 450s all have 2 cams

10-18-2009, 12:58 PM	#1 (permalink)
Coole PM Newbie Join Date: Aug 2009 Posts: 15	honda CRF100 roadracing mods Hey everyone! I am going to use a Honda CRF100 engine for roadracing. It has a Kitaco inner rotor ignition, 120cc BBR motorsports kit, K&N HA-1088 air filter, FMF Powercore 4T exhaust and a pd22 replacement carburator by RT. Now because the engine is originally made for off-road use the top speed is not very high. Does anyone have an idea on how to get the topspeed up? I would really like to get it to like 65+ mph.

10-18-2009, 01:01 PM	#2 (permalink)
rc164racer 2nd Gear Member Join Date: Sep 2008 Location: Brisbane, CA Posts: 916 My Mood:	Re: honda CRF100 roadracing mods Takegawa sport touring tranny. Gonna be hard to find someone to order it for you and might be pretty pricy but that will put you well over 75mph if you have enought power.

10-18-2009, 01:09 PM	#3 (permalink)
Coole PM Newbie Join Date: Aug 2009 Posts: 15	Re: honda CRF100 roadracing mods Actually the Takegawa transmission is really REALL expensive. I found it for $940 and that's like way to much! But if the transmission is really that important, won't a Honda CB100 transmission fit? That's a roadbike, so it probably has a different transmission.

10-18-2009, 01:41 PM	#4 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,987 My Mood:	Re: honda CRF100 roadracing mods CB100 trans is different, and in the series with the old 125/175/185/200 engines. Your 5th gear is a .92 overdrive already, anyway. Your easiest method is sprockets, up in front and/or down in back. There's also the $255 clutch basket and primary gear, that raises overall gearing by 17% or so. Speeds up the clutch, reducing torque load on it. Not sure on the Tak, but the stock trans ratio drops are 39/26/19/19%, while the 80 bolts in and is 30/23/19/15% gearing drops. Tightens things up a bit. Try calculating the RPM you're using now. The 45mm stroke XR doesn't mind a little buzzing The BBR cam is way too small, and the head needs some work to really zing. A bigger carb isn't a bad idea, either. Web 69/68 or 69 grind, with matching springs and retainers will add a bunch on top. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

10-18-2009, 06:43 PM	#5 (permalink)
Coole PM Newbie Join Date: Aug 2009 Posts: 15	Re: honda CRF100 roadracing mods Thanks for all the replies so far! I am really starting to get an idea of all the possibilities I have! But what does "Web 69/68 or 69 grind, with matching springs and retainers" Mean? Sorry for not understanding this, I am Dutch you know!

10-18-2009, 07:10 PM	#6 (permalink)
gman 1st Gear Member Join Date: Apr 2008 Location: Pittsfield, Massachusetts Posts: 240	Re: honda CRF100 roadracing mods Performace camshaft and valve springs Web Cam Inc. - Performance and Racing Camshafts

10-19-2009, 10:40 AM	#7 (permalink)
Coole PM Newbie Join Date: Aug 2009 Posts: 15	Re: honda CRF100 roadracing mods Okey thanks for all the replies so far! I think I am going to buy a Web 69/68 with matching springs and retainers and new sprockets. Any tips for the sprockets? Now I would really like to know what my topspeed will be with this parts installed!

10-31-2009, 11:27 PM	#8 (permalink)
tmoney745 PM Newbie Join Date: Oct 2008 Location: mass Posts: 41 My Mood:	Re: honda CRF100 roadracing mods i have super tall gearing on my stock motor.and it goes about 70mph.put a 15 on the front.and i went with the smallest sprocket i could find for the back.

11-04-2009, 06:11 AM	#9 (permalink)
fireman_343 2nd Gear Member Join Date: Mar 2007 Location: Blacklick Ohio Posts: 358 My Mood:	Re: honda CRF100 roadracing mods I've got a NSR/NSF that I roadrace with a CRF/XR100 motor with BBR120 kit, 69 grind Webcam, lighter flywheel, kitaco cam chain, 24mm round slide kehin carb, etc.. and I gear it for the long tracks I race at. 16 front with 38 on the rear. The major draw back with these motors (like said before) is the head. Get a super head and that will really wake up the motor. Also, the a oil cooler will help keep things cool when running that sucker at top speed, but you don't have the bodywork around the motor like I do, so it shouldn't be too much of a problem. If you find that the power starts to "fade" after a while, then you'll want to look into an oil cooler setup.

11-04-2009, 11:08 AM	#10 (permalink)
Coole PM Newbie Join Date: Aug 2009 Posts: 15	Re: honda CRF100 roadracing mods Hey! I can't find a front sprocket any bigger than 15 tooth! And the smallest rear sprocket I could find was only 40! That's why I would really like to know where you bought your sprockets! And the Kitaco cam chain, what is that for? By the way, what is your top speed now? Thanks for the replies so far, they're very useful! Last edited by Coole; 11-05-2009 at 12:35 PM.

11-11-2009, 09:23 AM	#11 (permalink)
slow600 2nd Gear Member Join Date: Feb 2007 Location: springfield missouri Posts: 519	Re: honda CRF100 roadracing mods convert to a 420 chain, much easier to find front sprockets.

11-11-2009, 07:26 PM	#12 (permalink)
fireman_343 2nd Gear Member Join Date: Mar 2007 Location: Blacklick Ohio Posts: 358 My Mood:	Re: honda CRF100 roadracing mods Yeah.. sorry.. I assumed that you were running a 420 chain. Swap to a 420 and you'll find all kinds of sprockets! My rear sprocket is different then yours since I race a NSR/NSF As far as my top speed.. I have no clue?? But, you can kinda see in this video of how fast I go against some of the KX65's.. This was a race at one of our short tracks. We race at BeaveRun in PA and I ran a 16 front and 38 rear I'm on the red GP style bike on pole at the start of the race... OYL MiniGP Race Circleville, Ohio Sunday Sept. 13 video by Jaymz996 - Photobucket -Brian www.teamquazzymoto.com # 4

11-11-2009, 08:45 PM	#13 (permalink)
hammer_213 PM Newbie Join Date: Sep 2009 Location: Denver Posts: 26 My Mood:	Re: honda CRF100 roadracing mods nice vid dood ...good racin

11-12-2009, 08:10 AM	#15 (permalink)
fireman_343 2nd Gear Member Join Date: Mar 2007 Location: Blacklick Ohio Posts: 358 My Mood:	Re: honda CRF100 roadracing mods Didn't offend me.. That is the only thing I don't like about my motor in the bike.. the head is what holds back all the power. But.. for reliability and what not.. stick with the stock head. The CRF/XR100 motors are bullet proof in stock form and even with mild mods.

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