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Old 08-12-2013, 03:16 PM   #5806
Woody2627
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Originally Posted by Kray View Post
Around 80mph. Mine was 77mph. There are so many different variables that it isn't an exact number. The bike does not have enough power to reach the theoretical max speed in stock form.
Tyre size is the only variable, everything is else is constant. There are plenty of aftermarket tachos available for under 100 bucks and they are easy to install. :
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Old 08-12-2013, 03:19 PM   #5807
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Originally Posted by Woody2627 View Post
Tyre size is the only variable, everything is else is constant. There are plenty of aftermarket tachos available for under 100 bucks and they are easy to install. :
weight, temperature, barometric pressure, wind direction, wind speed, humidity, traffic, grade ...to name a few. The EFI system is decent at trying to keep things equal but wind tends to be my biggest enemy.
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Old 08-12-2013, 03:31 PM   #5808
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Quote:
Originally Posted by Kray View Post
weight, temperature, barometric pressure, wind direction, wind speed, humidity, traffic, grade ...to name a few. The EFI system is decent at trying to keep things equal but wind tends to be my biggest enemy.
None of them will affect the relationship between crankshaft speed and road speed.
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Old 08-12-2013, 03:33 PM   #5809
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Originally Posted by SAPB View Post
Oh, I definitely see your point... But you were able to take your seat off, then put it back on, maybe an hour or so later and ride off. There aren't many if ever times, when I can be without a bike. And to ship, and have them do it, then send back would be at least a week. I'd freak out.
I agree! It is probably the only thing winter is good for! :-D
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Old 08-12-2013, 04:34 PM   #5810
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Originally Posted by marktbike View Post
Does anybody know the maximum speed in the six gears, with original gear ratios? Thanks!
On my CRF I did hit 135kph with little tail wind.. I am 75 kgs.
But most of the time 110kph- 120kph is very easy to reached...
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Old 08-12-2013, 06:25 PM   #5811
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I agree the best bang for the buck is the 13t, and no changing the chain. It's a JT JTF1321.13, less than $20 + shipping. Only thing is, your speedo is off then, 12 O'clock labs has the SpeedoDRD to fix this. I didn't think I would get the bar risers, but now I'm looking. Is it just 1" that you can do without cable problems? I'm staying with the stock bars, what have people been getting?
I think I'm going to try the 13T mod but so unsure as I ride a decent bit in metro traffic and often hitting the 70s mph. However, for the price, it sounds likes a fun weekend project.

I have installed the Rox Risers 2inch. They work excellent and I kept all stock cables and electric. I'm 6'2" and can stand up comfortably now. Easy mod to do as well. you will have to rotate your break lever a little upwards if you have aftermarket hand guards.
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Old 08-12-2013, 06:52 PM   #5812
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Originally Posted by Lost Rider View Post

I would think that you and most people around you up there are pretty resourceful and helpful with each other, and there's no real specialty tools needed to maintain this bike so you should be good .
Thanks Lost Rider, I checked out one of your posts in another thread concerning the valve inspection last night and it looks very interesting. I'm slightly intimidated by the thought of taking my bike apart (more like afraid to screw it up) but I like the idea of DIY, especially living up here so long, one does tend to become resourceful, and today I enlisted a coworker with some mechanical aptitude to help me with the first service. I am having slight anxiety with the return of memories related to cleaning the filters of my 1976 RM125 when I was 12 years old. I can still smell the fuel mix, and my bike was in the shop more than not, so I want to be careful. Thanks again.
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Old 08-12-2013, 09:12 PM   #5813
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MPG log online

Since nobody threw this out there when we were talking about gas mileage the other day.
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Old 08-12-2013, 10:17 PM   #5814
maginashun
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Octane?

Since it's been a long time since I've had to buy gas for a motorcycle and when I did it had to be a mixture, I have no idea what to get. I was at the pumps on Saturday just wasting time on my phone searching the internet and came up with nothing. So I couldn't wait any longer and just went with Unleaded (89). It's not surprising that I didn't find anything easily during my search after reading a thread. Seems like choice of octane ranks right up there with the Canon/Nikon, PS3/Xbox or PC/Mac debate. What do you run in yours?
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Old 08-13-2013, 02:15 AM   #5815
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Originally Posted by maginashun View Post
Since it's been a long time since I've had to buy gas for a motorcycle and when I did it had to be a mixture, I have no idea what to get. I was at the pumps on Saturday just wasting time on my phone searching the internet and came up with nothing. So I couldn't wait any longer and just went with Unleaded (89). It's not surprising that I didn't find anything easily during my search after reading a thread. Seems like choice of octane ranks right up there with the Canon/Nikon, PS3/Xbox or PC/Mac debate. What do you run in yours?
Owner's Manual page 28, unleaded only, pump octane number 86 or higher. 87 seems to be the lowest available around here, that's what I run.
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Old 08-13-2013, 02:38 AM   #5816
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Originally Posted by SAPB View Post
Owner's Manual page 28, unleaded only, pump octane number 86 or higher. 87 seems to be the lowest available around here, that's what I run.
Thanks for the info. I don't have access to mine right now.
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Old 08-13-2013, 05:18 AM   #5817
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Originally Posted by Woody2627 View Post
None of them will affect the relationship between crankshaft speed and road speed.
The relationship between crankshaft speed and road speed is limited by external forces. The CRF250L doesn't have nearly enough power to reach it's geared maximum speed from the factory. With a decent gust at your back and a racing suit on going downhill in a tuck you'll hit a higher top speed than Billy Bob in jeans and a t-shirt trying to power up a hill against the wind. It's physics.

Now, if the CRF250L had ~80hp this would be a different conversation. It could then reach it's maximum geared speed and be limited by internal mechanics. Not to mention, be awesome as duck.
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Old 08-13-2013, 05:55 AM   #5818
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You guys are just talking past each other. He meant to say, "theoretical, gearing limited top speed", or "speed at redline in 6th gear".

Anyway, here you go. 103.4mph with my (stock) rear tire and 14/40 gearing.

Code:
	1	2	3	4	5	6	
RPM\Ratio	3.333	2.118	1.571	1.304	1.115	0.963	RPM
1500	4.3	6.7	9.1	10.9	12.8	14.8	1500
1600	4.6	7.2	9.7	11.6	13.6	15.7	1600
1700	4.8	7.6	10.3	12.4	14.5	16.7	1700
1800	5.1	8.1	10.9	13.1	15.3	17.7	1800
1900	5.4	8.5	11.5	13.8	16.2	18.7	1900
2000	5.7	9.0	12.1	14.5	17.0	19.7	2000
2100	6.0	9.4	12.7	15.3	17.9	20.7	2100
2200	6.3	9.8	13.3	16.0	18.7	21.7	2200
2300	6.5	10.3	13.9	16.7	19.6	22.6	2300
2400	6.8	10.7	14.5	17.4	20.4	23.6	2400
2500	7.1	11.2	15.1	18.2	21.3	24.6	2500
2600	7.4	11.6	15.7	18.9	22.1	25.6	2600
2700	7.7	12.1	16.3	19.6	23.0	26.6	2700
2800	8.0	12.5	16.9	20.4	23.8	27.6	2800
2900	8.2	13.0	17.5	21.1	24.7	28.5	2900
3000	8.5	13.4	18.1	21.8	25.5	29.5	3000
3100	8.8	13.9	18.7	22.5	26.4	30.5	3100
3200	9.1	14.3	19.3	23.3	27.2	31.5	3200
3300	9.4	14.8	19.9	24.0	28.1	32.5	3300
3400	9.7	15.2	20.5	24.7	28.9	33.5	3400
3500	10.0	15.7	21.1	25.4	29.8	34.5	3500
3600	10.2	16.1	21.7	26.2	30.6	35.4	3600
3700	10.5	16.6	22.3	26.9	31.5	36.4	3700
3800	10.8	17.0	22.9	27.6	32.3	37.4	3800
3900	11.1	17.5	23.5	28.4	33.2	38.4	3900
4000	11.4	17.9	24.1	29.1	34.0	39.4	4000
4100	11.7	18.3	24.7	29.8	34.9	40.4	4100
4200	11.9	18.8	25.3	30.5	35.7	41.3	4200
4300	12.2	19.2	25.9	31.3	36.6	42.3	4300
4400	12.5	19.7	26.5	32.0	37.4	43.3	4400
4500	12.8	20.1	27.2	32.7	38.3	44.3	4500
4600	13.1	20.6	27.8	33.4	39.1	45.3	4600
4700	13.4	21.0	28.4	34.2	40.0	46.3	4700
4800	13.7	21.5	29.0	34.9	40.8	47.2	4800
4900	13.9	21.9	29.6	35.6	41.7	48.2	4900
5000	14.2	22.4	30.2	36.3	42.5	49.2	5000
5100	14.5	22.8	30.8	37.1	43.4	50.2	5100
5200	14.8	23.3	31.4	37.8	44.2	51.2	5200
5300	15.1	23.7	32.0	38.5	45.1	52.2	5300
5400	15.4	24.2	32.6	39.3	45.9	53.2	5400
5500	15.6	24.6	33.2	40.0	46.8	54.1	5500
5600	15.9	25.1	33.8	40.7	47.6	55.1	5600
5700	16.2	25.5	34.4	41.4	48.5	56.1	5700
5800	16.5	26.0	35.0	42.2	49.3	57.1	5800
5900	16.8	26.4	35.6	42.9	50.2	58.1	5900
6000	17.1	26.9	36.2	43.6	51.0	59.1	6000
6100	17.3	27.3	36.8	44.3	51.9	60.0	6100
6200	17.6	27.7	37.4	45.1	52.7	61.0	6200
6300	17.9	28.2	38.0	45.8	53.6	62.0	6300
6400	18.2	28.6	38.6	46.5	54.4	63.0	6400
6500	18.5	29.1	39.2	47.3	55.3	64.0	6500
6600	18.8	29.5	39.8	48.0	56.1	65.0	6600
6700	19.1	30.0	40.4	48.7	57.0	66.0	6700
6800	19.3	30.4	41.0	49.4	57.8	66.9	6800
6900	19.6	30.9	41.6	50.2	58.7	67.9	6900
7000	19.9	31.3	42.2	50.9	59.5	68.9	7000
7100	20.2	31.8	42.8	51.6	60.4	69.9	7100
7200	20.5	32.2	43.4	52.3	61.2	70.9	7200
7300	20.8	32.7	44.0	53.1	62.1	71.9	7300
7400	21.0	33.1	44.7	53.8	62.9	72.8	7400
7500	21.3	33.6	45.3	54.5	63.8	73.8	7500
7600	21.6	34.0	45.9	55.2	64.6	74.8	7600
7700	21.9	34.5	46.5	56.0	65.5	75.8	7700
7800	22.2	34.9	47.1	56.7	66.3	76.8	7800
7900	22.5	35.4	47.7	57.4	67.2	77.8	7900
8000	22.8	35.8	48.3	58.2	68.0	78.7	8000
8100	23.0	36.3	48.9	58.9	68.9	79.7	8100
8200	23.3	36.7	49.5	59.6	69.7	80.7	8200
8300	23.6	37.1	50.1	60.3	70.6	81.7	8300
8400	23.9	37.6	50.7	61.1	71.4	82.7	8400
8500	24.2	38.0	51.3	61.8	72.3	83.7	8500
8600	24.5	38.5	51.9	62.5	73.1	84.7	8600
8700	24.7	38.9	52.5	63.2	74.0	85.6	8700
8800	25.0	39.4	53.1	64.0	74.8	86.6	8800
8900	25.3	39.8	53.7	64.7	75.7	87.6	8900
9000	25.6	40.3	54.3	65.4	76.5	88.6	9000
9100	25.9	40.7	54.9	66.2	77.4	89.6	9100
9200	26.2	41.2	55.5	66.9	78.2	90.6	9200
9300	26.4	41.6	56.1	67.6	79.1	91.5	9300
9400	26.7	42.1	56.7	68.3	79.9	92.5	9400
9500	27.0	42.5	57.3	69.1	80.8	93.5	9500
9600	27.3	43.0	57.9	69.8	81.6	94.5	9600
9700	27.6	43.4	58.5	70.5	82.5	95.5	9700
9800	27.9	43.9	59.1	71.2	83.3	96.5	9800
9900	28.2	44.3	59.7	72.0	84.2	97.4	9900
10000	28.4	44.8	60.3	72.7	85.0	98.4	10000
10100	28.7	45.2	60.9	73.4	85.9	99.4	10100
10200	29.0	45.7	61.5	74.1	86.7	100.4	10200
10300	29.3	46.1	62.1	74.9	87.6	101.4	10300
10400	29.6	46.5	62.8	75.6	88.4	102.4	10400
10500	29.9	47.0	63.4	76.3	89.3	103.4	10500

Not only doesn't the LRP's low horsepower let it pull to redline, but the rev limiter is very high compared to the horesepower curve. HP peaks at 8k, and drops hard after 9k. By redline, it's only making about 7 lb-ft of torque. With stock gearing, you can't even redline 4th gear, because that measly 7 lb-ft won't pull it to the theoretical max of 76.3mph. That means on level ground, this bike can only redline 3 of its 6 gears!

Put another way, at 75mph, 6th gear pulls harder than 4th gear, even though the mechanical advantage of that gear ratio is so much worse (0.963 vs 1.304). Instead of 14hp in 4th, you've got 18hp in 6th!
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Old 08-13-2013, 07:00 AM   #5819
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Originally Posted by Auto-X Fil View Post
You guys are just talking past each other. He meant to say, "theoretical, gearing limited top speed", or "speed at redline in 6th gear".

Anyway, here you go. 103.4mph with my (stock) rear tire and 14/40 gearing.

Put another way, at 75mph, 6th gear pulls harder than 4th gear, even though the mechanical advantage of that gear ratio is so much worse (0.963 vs 1.304). Instead of 14hp in 4th, you've got 18hp in 6th!
Yup, never bounced it off the rev limiter. It just "poops out", then you shift.
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Old 08-13-2013, 09:38 AM   #5820
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Preciate the clarification, good sir
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