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Virago 250 Front and rear sprocket upgrades

This is a discussion on Virago 250 Front and rear sprocket upgrades within the Yamaha forums, part of the Manufacturers category; I recently purchased a Virago-250 (now called V Star 250) last month. I am strongly considering changing the front sprocket ...


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Old 08-23-2006   #1
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Default Virago 250 Front and rear sprocket upgrades

I recently purchased a Virago-250 (now called V Star 250) last month. I am strongly considering changing the front sprocket to 17 teeth and the rear sprocket to 38 teeth.

Has anybody used a 17/38 tooth sprocket combination with good success?

My question also is, do you have any clutch slippage in 1st gear when starting out, and how much power/acceleration do you have in 1st gear?

Any additional comments, pointers, tips would be much appreciated.

Thanks,

Michael
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Old 08-24-2006   #2
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Default Virago 250 Front and rear sprocket upgrades

Why such a significant change from stock???? I'm guessing you are wanting more top end and you are going to use the bike to commute, but with that gear ratio and the small 250cc engine I would guess that your acceleration would suffer.
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Old 08-24-2006   #3
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Default Virago 250 Front and rear sprocket upgrades

Stock sprockets are 16 front, 45 rear for the Virago-250 (V Star 250).

A popular upgrade is to replace the sprockets so that the gearing is taller.
Taller gearing requires less frequent shifting and even better fuel economy. The Virago 250’s V-twin provides sufficient torque to cope with taller gearing.

I have read that 17/42 works well. I have read some folks using 17/38, but they haven't reported if there is any clutch slippage or poor acceleration in 1st gear.

If anybody has any experience with these gear ratios, please share your observations.
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Old 08-25-2006   #4
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Default Virago 250 Front and rear sprocket upgrades

I own a 2008, Yamaha V Star 250 that I upgraded with a tachometer and a wind-deflector. I went ahead and changed my front and rear sprockets from 16/45 to 17/38. The change is hard to believe. There is no clutch slippage in 1st gear and great acceleration in all gears including 1st. I had it at 75 mph at 5,900 rpm in 5th gear. If I had done this with the stock sprockets the rpm's calculated would have been 7,500 rpm. I am 5 ft 10. inches and weigh 200 lbs, yet this bike has a lot of torque and acceleration even with the 17/38 change, and best of all riding on the interstate is now very possible. I have just over 500 miles on the bike now, and still in the break in 1000 mile period. So I did not try to max out the speed, but it has a lot of punch and throttle left after 75 mph. I list below the actual road data and theoretical calculations for the benefit of others. I also am attaching a jpg image of this data plotted up.


Road Data 16/45 in 5th gear
-
RPM MPH
-----
2,500 25
3,100 30
3,600 35
4,475 45
5,400 55


Road Data 17/38 in 5th gear
-
RPM MPH
-----
3,100 40
3,500 45
3,900 50
4,300 55
4,700 60
5,100 65
5,500 70
5,900 75


Theoretical Data - RPM vs MPH in 5th gear
--
RPM 16/45 17/45 17/44 17/43 17/42 17/41 17/40 17/39 17/38
----
2,400 24 25 26 27 27 28 29 29 30
3,200 32 34 35 35 36 37 38 39 40
4,000 40 42 43 44 45 46 48 49 50
4,800 48 51 52 53 54 56 57 59 60
5,600 56 59 61 62 64 65 67 68 70
6,400 64 68 69 71 73 74 76 78 80
7,200 72 76 78 80 82 84 86 88 90
8,000 80 85 87 89 91 93 95 98 100


file://C:XV250.JPG
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Old 04-26-2009   #5
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Default HP?

I am thinking of geting a smaller back sprocket on my virago but i dont know if i will get the same performance as you did. :(
What HP do you have on your v star 2008 ? :)

And where did you get the technical data:

''Theoretical Data - RPM vs MPH in 5th gear
--
RPM 16/45 17/45 17/44 17/43 17/42 17/41 17/40 17/39 17/38
----
2,400 24 25 26 27 27 28 29 29 30
3,200 32 34 35 35 36 37 38 39 40
4,000 40 42 43 44 45 46 48 49 50
4,800 48 51 52 53 54 56 57 59 60
5,600 56 59 61 62 64 65 67 68 70
6,400 64 68 69 71 73 74 76 78 80
7,200 72 76 78 80 82 84 86 88 90
8,000 80 85 87 89 91 93 95 98 100''
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Old 04-26-2009   #6
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Default

I am thinking of geting a smaller back sprocket on my virago but i dont know if i will get the same performance as you did. :(
What HP do you have on your v star 2008 ? :)

And where did you get the technical data:

''Theoretical Data - RPM vs MPH in 5th gear
--
RPM 16/45 17/45 17/44 17/43 17/42 17/41 17/40 17/39 17/38
----
2,400 24 25 26 27 27 28 29 29 30
3,200 32 34 35 35 36 37 38 39 40
4,000 40 42 43 44 45 46 48 49 50
4,800 48 51 52 53 54 56 57 59 60
5,600 56 59 61 62 64 65 67 68 70
6,400 64 68 69 71 73 74 76 78 80
7,200 72 76 78 80 82 84 86 88 90
8,000 80 85 87 89 91 93 95 98 100''
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Old 04-27-2009   #7
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Location: Salt Lake City, UT
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Default

I'm considering purchasing a 2007 Virago 250 and will be swapping out the sprockets with the 17/38 combo most likely. Your data was extremely helpful in convincing me to go ahead with the purchase.

One thing I'd like to know is, how many links did you drop in your chain for such a big change in sprocket size? A neighbor of mine also swapped out his 1989 Virago 250 sprockets for the 17/38 combo but can't remember how many links he dropped in his chain (if any). His little bike cruises easily at 70 miles per hour and he's even had it up to 110! He agrees that's a bit much for the weight and size of this little bike.

Anyway, if anyone has some advice on how many chain links i'll have to drop, I'd appreciate it.

thanks,
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Old 05-05-2010   #8
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Default 17/38 is a mistake

I read the other posts and did it, now the top speed is 105 km/h (down from 135 km/h yesterday). First 4 gears are fine for city streets, but the 5th is now useless. On an up ramp bike slows down to 85 km/h because it has no power.

Don't believe everything people are posting. I wasted 200 $, and will cost me another 200 $ to change it back to 16/38 or even 16/40 to get the 5th gear back.
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Old 05-17-2010   #9
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Default 17f 43r

I live in Colorado and wanted a bit more out of my XV250 so I upgraded to a 17 tooth front sprocket and a 43 tooth rear sprocket. I was a bit hesitant being that it's carb'd and I'm in such high altitude. I did it and the results were amazing. First gear will get me to about 15mph, second gear to about 30mph, third gear to about 45mph, fourth gear to about 55-60mph, and fifth gear is now past 70mph. It does loose a bit of power in fifth gear if I'm going up hill but other than that it's not a problem. I was amazed that starting out in first gear was fine. There was no hesitation and it had plenty of get up. Keep in mind I'm over 6,000 feet elevation and it runs great! The same stock chain will work with this new set up and you do not need to take links out, nor do you need to modify anything else. It literally took me 1.5 hours to install. I would not recommend a 38r sprocket. I think the 43r is the lowest I will go. Ride safe.
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Old 06-16-2010   #10
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Default gotta try sumthin

Bought a 2006 yesterday. Nice bike. 2006 with 1200 miles on it. Only complaint is top end is about 50mph, Im 5'11,200lb. Gets to 45 pretty quick but all these guys saying they can do 70+ must be going downhill with a strong wind behind them. Think I may have to try the 17/43 in the near future.
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