performane difference between 700 and 750 2nd gen

vfr 750 rated at105 hp vfr700 rated at 76hp.
that is a lot between the two.
IS one rated at the crank and one the rear wheel.
I have 86 700 with a good engine ,but I also just bought a 86 750 engine and plan on doing an engine swap.It just seems like alot for 50cc difference.
thanks

 

It does seem like a lot of difference. The ratings are both at the crank. I've not ridden a 700; but I know my 750 feels like 100hp. Does your 700 feel like that?

 

the 700 i am just now finishing putting together ,got it in a trade out for some work on a busa,thought i would put it together for sentimental reasons,bought a new 750 in 86,traded my vf1000f in for it.last bike i owned before getting this was my turbocharged 1428 kaw drag bike.not a fair comparison.:smile:
Just bought the 86 750 for the engine and parts.

Thanks,
Gary

 

It's about 5 hp difference, I never could tell the difference in 87 when I rode both. The 105 is brake hp and 76 rear wheel hp.

 

I did the 1986 700>750 conversion this spring. The engine pulls through the midrange faster. You are going to like it.

 

I would like to this at some point.

 

Jeez !!! Do some people really think that a VFR 700 is not fast enough ???? Really ?

 

vfr 700,94 hp at crank.Now the numbers make more sense.:crazy:
thanks for the input,

gary

 

That does make more sense, where'd you find that?

 

found the information at VFR700F Specs

 

Thanks, and for the link as well. :wink:

 

Yes, the extra 50cc is like an extra moped or something. I thought you knew that squirrel.

 

Yeah, a moped or four chainsaws, that's like 50 extra HP, amirite?? :wink:

 

Obviously you didn't ride my bike before and after so you really don't have a reference point do you? The 750 engine in effect has a mild stroker kit in it. Same bore. Same gearing. Each time the engine fires the piston slides down faster, it has more leverage on the crankshaft, simple physics.

Perhaps you would rather have 50cc less. I spent 300 dollars on an upgrade of performance, no increase in weight, No downside except spending $300. Pick out a way to add more midrange on a 25 year old bike for 300 dollars. No sessions tuning it. Just bolt on. Is my bike as fast as a new one? Probably not but it has more response everytime I twist it.

Exhaust gas analysis? Man you live in a different world than I do. My carbs were just moved from one engine to the other. No adjustments. It idles fine and starts up nearly instantly.

I chain saw wood every week in the fall as we heat with wood. My chain saw has 45cc and will tear through your thigh in 2 seconds if you don't pay attention. Try that with a hand saw. Adding 50 cc is a noticeable difference. Someone said 11 hp more. It feels like it.

Is the 700cc engine enough. Yeah sure.
Is more better as long as you don't pork it up??? By all means.

 

Apparently some think 250cc's is more than enough.

 

Tink, back off the dude, if he said his bike is faster it is faster, not everybody has disposable income to dyno thier bike every time they make a change to it. I have never dyno'd mine and I have changed my carb insulators and you know what IT RUNS BETTER .... is it not true because I didn't dyno it?

bsides he changed the whole engine out and used the carbs from his 700...

all though I will agree that he should sync his carbs.. it will probably run a hair better than what it is doing right now...