So I had my 650 dynoed this weekend.

[AF_Bill]

My buddies and I went to a bike show sunday and there was a vendor that had a dyno. I wanted to see exactly how much horsepower I was puttin out. Once she was on the dyno, I was impressed, as well as a few people watchin, that she didn't pop or backfire like all the harley's did. After they were done, they gave me the print out. My carbs are PERFECTLY tuned, which made me happy. But the best pull was 50 HP and 35 ft lbs of torque. Is that about what it should be puttin out?? What are some tips/mods I can do to get more horsepower & torque?

[Hammered]

If you go by manufacture specs, those seem a little low.

http://www.motorcyclespecs.co.za/model/suzu/suzuki_gs650g%2081.htm

Being as the G and the K are the same engine. I have no idea what mine pushes at this point. Im sure a 26 year old bike that hasnt been rebuilt is running the same numbers it did years ago.

[reddirtrider]

Keep in mind that dyno hp readings vary from one to the next, from operator to operator, and even depending on the weather.

[Macmatic]

Keep in mind that dyno hp readings vary from one to the next, from operator to operator, and even depending on the weather.

Could be that site is showing DIN rated HP too. I know there is a difference between DIN and SAE ratings but I don't know which way it goes without.... oh here, check this:

http://tinyurl.com/lter86 it looks like about 70hp after converting from Kw

/\/\ac

[850 Combat]

Factory horsepower claims were rated at the brochure

[tas850g]

my brother has a dyno and i'm thinking about putting the 850 on in at some point. Then in a year or two i'll need to replace the stock exhaust then perform another run with V&H to see the difference.

[Nessism]

50 hp sounds about right to me. There are losses getting the power to the ground compared to mfg ratings that are at the crank. My guess is that if the dyno were corrected for things like weather and pressure factors the hp may increase a little but not a whole lot.

[AF_Bill]

The dyno was damn accurate. My buddy's 08 Fatbob was dynoed earlier this year after in did a stage 2 upgrade. It was puttin out 90 hp. He installed bigger baffalds (the kit came w/2) which made it louder. He put it on the dyno and it was still at 90 hp. He was a lil upset about that but I thought it was slightly funny.

I plan on puttin a MAC 4-2 exhaust on (whenever it comes back on eBay) and a K&N filter. Thats about all I wanna do now cuz I wanna ride more that work on my bike.

[doctorgonzo]

That does sound about right, a 1000 is only mid 80's (stock... at the crank) right?

[TheCafeKid]

Probably...ANY HP rating, be it from a manual, or or brochure or whatever is AT THE CRANK. Dyno ratings will vary from dyno to dyno, dpending on the program, calibration, operator, ambient interference, etc etc...50HP sounds pretty good, considering i believe that the 650 is rated at 67HP at the crank, a 17HP reduction thru the drive chain is a little much, but not completely out of the realm of reality...what a Dyno, IMO is best for is simply assuring that the bike is operating at desired levels THROUGHOUT the operating range, that there are no sharp spikes in power output, unless its desired etc etc.

[trippivot]

yep there is more HP at the crank on a eddy brake dyno compared to an accelerometer dyno.

the transmission and chain take 15 ~ 20 % right off the top

[beergood]

I don't really think I want to know what the dyno info for my bike is. It definitely feels fast for an old bike, and I can guarantee that it is faster than it was when I got it. Besides, we all know these bikes aren't actually fast so much as they are vintage-fast.

To me fast is a feeling, a perception. If your bike feels fast, a concrete number is more likely to disappoint than not.

Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.

[49er]

I don't really think I want to know what the dyno info for my bike is. It definitely feels fast for an old bike, and I can guarantee that it is faster than it was when I got it. Besides, we all know these bikes aren't actually fast so much as they are vintage-fast.

To me fast is a feeling, a perception. If your bike feels fast, a concrete number is more likely to disappoint than not.

Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.

Hey, I like your last paragraph. Yes, sometimes it's better not to know.

I only put my 850 on the dyno because I wanted to measure the increase in performance over stock numbers. I had a Aussie dyno test done in '79 to compare with. The Aussies got 57 hp at the wheel, mine did 73 hp. I'm pretty rapt with that. HP increased by 28%. Torque increase was even more impressive, but the Aussie curve was pretty flat in the 3000 -5000 rpm range and didn't improve as much as I would have expected to red line. I think their needles weren't set right.

I'm still running stock carbs and airbox too.

[redsoxvw]

yep there is more HP at the crank on a eddy brake dyno compared to an accelerometer dyno.

the transmission and chain take 15 ~ 20 % right off the top

I agree with this.....After an engine build on a souped up cage, I went to the dyno and pushed 625hp to the wheels. I was expecting more, and kind of bummin, but after I accounted for the drive train loss.....All was good.......tranny and chain ( or shaft) eat up some power

[TheCafeKid]

I don't really think I want to know what the dyno info for my bike is. It definitely feels fast for an old bike, and I can guarantee that it is faster than it was when I got it. Besides, we all know these bikes aren't actually fast so much as they are vintage-fast.

To me fast is a feeling, a perception. If your bike feels fast, a concrete number is more likely to disappoint than not.

Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.

I dont care who you are..THAT is funny! And so true too...