Horsepower and Top Speed of CRF 100
Posted May 22, 2006 - 07:27 PM
The 150 has 12 hp and weighs 223#
The 100 only weighs 165 #.
If the 100 has only a bit less hp than the 150, then since the 100 is much lighter, it may accelerate faster and have a highter top speed.
What is the reality of this comparision?
Has anyone driven both or know the facts about the crf 100's top speed or horsepower?
I have never driven either.
Posted May 22, 2006 - 08:43 PM
The 150 is heavier, but it also has 50% more displacement. That is huge, much bigger than you think. The correlation between horsepower and displacement cannot be measure as a simple 50% increase. its more complicated.
With more torque on the 150, it will have higher gearing (i.e. bigger sprocket). That means that it will gain and hold increased speed at lower revs. This is really what biger displacement is all about.
I would be more concerned the weight of the 150 though. Although the cc's are there to move it, its still heavy.
Posted May 22, 2006 - 09:34 PM
Posted May 22, 2006 - 09:40 PM
Yes, I'm kinda joking, but there's way more to it than cc's and power. And when someone say 12 hp, where is it measured, the countershaft or rear wheel???? I've dynoed the older CRF150's and we got 9.6hp with a nobbie tire. Also, look at the TTR125le, is a great middle bike. Your best bet is to ride a few different models, then pick one you feel most comfortable on.
Posted May 23, 2006 - 03:48 AM
I'm 36 , 5"10" and 150#
I have owned atvs for 16 years.
I am an experienced atv rider.
I have a polaris sportsman 500 and a Yamaha Rhino. I had a Kawasaki prairie 650 too, so I'm accustomed to power, but for a motorcycle I don't want a lot of power because I absolutely won't use it.
I trail ride about 100 miles per month.
I had some experience in my brother in laws YZ 125 2 stroke back in 1999.
I think about getting a bike each year and never get one. I will get one this year.
His son just got a 50cc baja motorsports from pep boys.
This thing is a blast even for me. It goes 50 miles per hour and has amazing power for a 50cc.
I was going to get the crf 230, but I want to stick to something smaller so I can man-handle it easier. The 50cc that my nephew has is quite small for me obviously, but I like the fact that I can handle it well. The YZ 125 was so tall I didn't like it.
The 100 is much lighter than the 150 and the seat height is only 2" shorter.
than the 150.
I asked about hp so I could calculate the power to weight ratio.
I asked about top speed because I want to hit about 45 mph or more. Under 40 mph would be too slow for my needs.
I will NOT make it street legal.
I will keep it stock. If I want more power I'll just sell it and buy a bigger one.
Thanks for the info.
I will make this a separate post too with a more appropriate subject title.
Posted May 23, 2006 - 08:40 AM
Posted May 23, 2006 - 12:42 PM
Posted May 23, 2006 - 02:21 PM
Posted May 24, 2006 - 01:23 PM
Posted May 24, 2006 - 08:34 PM
Posted May 29, 2006 - 04:31 PM
Posted December 17, 2012 - 05:49 AM
Posted December 18, 2012 - 11:31 AM
Of all of those, the TTR 125 with electric start is the best deal around for ease of riding and teaching a new rider.
Millions of kids learned on an XR100, but the TTR is better now.
Posted December 22, 2012 - 05:39 AM
The top speed of any vehicle has to do mostly with the gearing provided. You can easily increase the top speed simply by lowering the final drive ratio. That is, installing a smaller rear sprocket or larger front sprocket. Both of these bikes will do somewhere in the 55 mph range on the dyno. That does not include air resistance and other incidental factors that will affect top speed. That does not go on forever of course and every vehicle reaches a "wall" of how fast it will go due to the amount of power available to propel that vehicle. Generally the gearing provided by the manufacturers is a great compromise of good acceleration and top speed. Deviation from this gearing usually increases one while diminishing the other.
The XR/CRF 100 makes about 7.5 rear wheel HP and weighs about 170 pounds. That's a HP/Weight ratio of about 23lbs/HP
The CRF150F makes about 11 rear wheel HP and weighs about 235 pounds. That's a HP/Weight ratio of about 21lbs/HP
You can see they are very similar and if you were to "drag race" these two models with riders of the same weight and skill level it would be a very close race. If you've ridden both of these models you already know this.
If you are going to racing in the 150 air cooled or Mad Dog classes an XR100 with a professionally built race engine will perform much better than the heavier 150F. If, however, you are trail riding, jumping, slamming ruts and generally riding the wheels of the bike the 150F is much better than the 100. The intent of the 100 is as a beginner bike. The 150F can be ridden by adults and anyone who wants an "indestructible" play bike. You can see just by examining the 150F that Honda engineered this bike to take a lot of abuse. It is HEAVY DUTY. That is the reason why it weighs so much and really does not perform any better than the 100 as far as acceleration goes.
We build extremely high performance 100s and are consistently producing engines in the 19-20 HP range. The 150F, even with mods, will not even come close to these bikes. Most everyone in this racing district uses the 100 as it has such an advantage with the lighter weight and huge potential the engine has to make big power. The 150F engine needs a LOT of work to make small improvements. It doesn't breath well at all and that stifles it's ability to make big HP.
The only exception to this is for people who are tall and or big. The 150F is a better choice as it has much roomier ergonomics than the 100 and some of these folks are just too big for a 100. Both bikes, being Hondas, are excellent bikes and offer lots of fun and enjoyment with incredible reliability. I don't see how you can go wrong with either one. Just depends on what your uses are going to be.
Posted December 22, 2012 - 06:05 AM
We build extremely high performance 100s and are consistently producing engines in the 19-20 HP range.
Um? How in gods name are you getting 20hp out of a 100? Aftermarket head and associated Takegawa/Kitaco stuff or in house stuff?
Posted December 22, 2012 - 08:18 AM
Posted December 22, 2012 - 01:38 PM
Yes, we consistently make 18 to 20 rear wheel HP. We do use a lot of Takegawa parts to achieve this. However I use many of my own parts to get to these numbers. Most importantly the carburetor and manifold set up. They need to be tuned properly to see this power level consistently. I've experimented with just about everything under the sun besides the kitchen sink on these 100s. The Takegawa head is the best in the business but believe it or not you can get more out of it with careful cam selection. I have my own carb combination that works excellent. Idles like a stock engine and is as smooth as silk.
150r typically produce about 22 rear wheel HP. Some are better than others but then some have a lot more time on them than others. As soon as the engine is started for the first time it begins to have a diminished power output simply due to wear. A brand new engine will almost always produce the most power. As time goes on the rings continue to wear and you are slowly losing power. That's why if you are a serious racer you freshen your top end as often as possible. Nothing better you can do under a couple hundred dollars. This is why you see variations in similar bikes.
I'll get up some dyno graphs soon so anyone who is interested can see the HP and torque curves.
IF you are interested in dynomometers and how they work you can read more about them in this technical article that I've written. http://www.procycles...yno_tuning!.htm
Building a Dirt Bike by htimsrolyat
XR200R Modification Guide by Quick Draw
CRF 80 XR 80 Suspension Rear Shock Fix by WAKTMRider