1st gen performance question

James Popp · 05-11-2008, 10:14 PM

Hello everyone,

I've been riding my '84 vf750f for five seasons now and have a question about performance. On this site I've heard it said that interceptor's have good torque down low and remember there they're a four cylinder bike around 8000 rpm where a pretty sharp kick in the pants comes in. While overall I'm pretty satisfied with my bikes performance and believe its running pretty strong, I have to say I don't feel much of a performance increase at the higher revs; it just seems to keep pulling consistantly from 4500 rpm to the 10500 rpm redline.

Should I be feeling more on top? The bike has full kerker pipes and a k&n airfilter. I'm not sure if the jetting is stock or not, I'll try to get ahold of the original owner who installed the pipes. Any thoughts?

P.S. the cams were replaced with a nice clean pair over the winter. High rpm used to be poor from pitted cams but thats no longer an issue.

KC-10 FE · 05-11-2008, 10:19 PM

I think the sharp kick in the pants you're describing would be the guys with the 6th Gen talking about the VTEC transition.

I don't remember a top end hit on any of the VF700's I've riden in the past.

KC-10 FE out...

eddievalleytrailer · 05-11-2008, 10:24 PM

My '83 pulls smoothly all the way up to redline. I don't think you'll feel a "kick" on a 1st gen VF. Now, the 6 Gen bikes...WAHOOO!!! 6500 and up.

James Popp · 05-11-2008, 10:34 PM

Ok, thats reassuring. I've been alittle worried that I might not be getting enough fuel on top end. I'll still try to find out if the jets are stock, I heard my setup really is better one size larger on main and slow jets. Thanks guys.

VFRShorty · 05-11-2008, 11:54 PM

Once I hit 8k rpms on my bike there is a definite difference, but that just might be me.

zbone25 · 10-08-2008, 09:41 AM

I know on my 1st gen vf 1000 there is a definate kick in the pants. especially when it will hit 130 in 3rd no prob

masonv45 · 10-08-2008, 11:39 AM

Sounds like a carb sync and pilot screw adjustment may be in order.

HOWEVER, if the bike has been jetted for the exhaust and filter, you may not experience the "kick in the pants" others are describing.

Honda leaned out the bike right where the EPA tested emissions (4-6K approx). On higher rpms, the mixture was richened up.

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05-11-2008, 10:14 PM	#1 (permalink)
James Popp Member Join Date: Mar 2007 Last Online: 12-05-2008 04:55 PM Location: Wisconsin My Ride: '84 VF750F Posts: 49 Thanks: 0 Thanked 0 Times in 0 Posts	1st gen performance question Hello everyone, I've been riding my '84 vf750f for five seasons now and have a question about performance. On this site I've heard it said that interceptor's have good torque down low and remember there they're a four cylinder bike around 8000 rpm where a pretty sharp kick in the pants comes in. While overall I'm pretty satisfied with my bikes performance and believe its running pretty strong, I have to say I don't feel much of a performance increase at the higher revs; it just seems to keep pulling consistantly from 4500 rpm to the 10500 rpm redline. Should I be feeling more on top? The bike has full kerker pipes and a k&n airfilter. I'm not sure if the jetting is stock or not, I'll try to get ahold of the original owner who installed the pipes. Any thoughts? P.S. the cams were replaced with a nice clean pair over the winter. High rpm used to be poor from pitted cams but thats no longer an issue. __________________ ------------------------------------------------------ JPopp -- '84 750 - kerker pipes, corbin seat, hyperpro shock, dodge oil kit, galfer brake lines -- Never hold discussions with the monkey when the organ grinder is in the room

05-11-2008, 10:19 PM	#2 (permalink)
KC-10 FE I FREAKING RULE!!! Join Date: Jul 2003 Last Online: 01-05-2009 12:29 PM Location: Communist Peoples Republic of NJ - Find Me! My Ride: 2000 VFR800fi (Pearl Yellow) 1989 Hawk GT (Italian Red) 2005 Piece Of Shit F150 Lariat (Dark Bullfighter Red) View my Photo Gallery Posts: 1,591 Thanks: 13 Thanked 50 Times in 37 Posts	I think the sharp kick in the pants you're describing would be the guys with the 6th Gen talking about the VTEC transition. I don't remember a top end hit on any of the VF700's I've riden in the past. KC-10 FE out... __________________ Instructor Side Sitting Switch Monkey Motorcycle Safety Foundation RiderCoach USAF Sport Bike Coach Stupid Hurts & Stupid Kills. Don't Be Stupid. ATGATT http://www.rockthegear.org 2000 VFR800fi Pearl Yellow 1989 NT650 Hawk GT Italian Red I don't discriminate, I hate EVERYBODY! Fight Communism, Free The People's Republic of New Jersey!!! RIP TSgt Christopher D Rey 1 Apr 1968 - 28 Aug 2006

05-11-2008, 10:24 PM	#3 (permalink)
eddievalleytrailer Uber Guru Join Date: May 2007 Last Online: Today 06:57 AM Location: Jonesborough, TN - Find Me! My Ride: 82 V-45 Sabre 83 VF750F Interceptor 91 XR250L 03 Shadow ACE 07 RWB Interceptor View my Photo Gallery Posts: 1,286 Thanks: 52 Thanked 52 Times in 33 Posts	My '83 pulls smoothly all the way up to redline. I don't think you'll feel a "kick" on a 1st gen VF. Now, the 6 Gen bikes...WAHOOO!!! 6500 and up. __________________ Proud Member Sixth Gen Militia-1st VTEC Battalion

05-11-2008, 10:34 PM	#4 (permalink)
James Popp Member Join Date: Mar 2007 Last Online: 12-05-2008 04:55 PM Location: Wisconsin My Ride: '84 VF750F Posts: 49 Thanks: 0 Thanked 0 Times in 0 Posts	Ok, thats reassuring. I've been alittle worried that I might not be getting enough fuel on top end. I'll still try to find out if the jets are stock, I heard my setup really is better one size larger on main and slow jets. Thanks guys. __________________ ------------------------------------------------------ JPopp -- '84 750 - kerker pipes, corbin seat, hyperpro shock, dodge oil kit, galfer brake lines -- Never hold discussions with the monkey when the organ grinder is in the room

05-11-2008, 11:54 PM	#5 (permalink)
VFRShorty VFRW Princess & Chat Modz Join Date: Mar 2008 Last Online: Today 01:31 PM Location: NW Oregon - Find Me! My Ride: 1987 Honda VFR700F F1R Exhaust Posts: 564 Thanks: 10 Thanked 13 Times in 12 Posts	Once I hit 8k rpms on my bike there is a definite difference, but that just might be me. __________________ "Oregon riders do it wet!" VFR Owners/Lovers Club (Myspace) http://groups.myspace.com/vfrowners

10-08-2008, 09:41 AM	#6 (permalink)
zbone25 Junior Member Join Date: Oct 2008 Last Online: 11-22-2008 04:52 PM Location: middle of no where Indiana My Ride: 1984 interceptor 1000 Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	I know on my 1st gen vf 1000 there is a definate kick in the pants. especially when it will hit 130 in 3rd no prob

10-08-2008, 11:39 AM	#7 (permalink)
masonv45 Senior Member Join Date: Apr 2007 Last Online: Yesterday 11:27 AM My Ride: 1985 VF700F Posts: 694 Thanks: 0 Thanked 17 Times in 16 Posts	Sounds like a carb sync and pilot screw adjustment may be in order. HOWEVER, if the bike has been jetted for the exhaust and filter, you may not experience the "kick in the pants" others are describing. Honda leaned out the bike right where the EPA tested emissions (4-6K approx). On higher rpms, the mixture was richened up. __________________ 1985 VF700F 1983 V45 Magna Gone but not Forgotten Memphis, TN

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