Help Support VMAX Forum:
"can anyone tell me if 39mm kehin carbs are worth it"
Worth it as in $$$$ or as in additional performance?
Do you have 2K to spend?
My experience is with PCW's Kehins, their are several other styles on the market.
For a big motor "1400 -1500 cc's" they work great, but on a stock size motor they are over kill. Plus you need to educate yourself on how to tune them, do you like to tune carburetors? Can you do the work yourself? If not stay with the Stage 7.
I have had my Kehin's for 6 years now and like the way they perform. But I run no air cleaners on them, which means every year I take them off the bike and give they a complete cleaning. They tend to have a "bog" if you snap open the throttle. You have to get used to them and how to roll them on. They also do not like to start in the cold weather. Also they are sensitive to elevation and temperature changes, so they may work great in the spring but once it gets hot out, you have to change some of the settings.
As far as Performance over Stage 7, on a stock cc motor you may see a few more HP on the top end. I found that they made more torque in the middle RPM ranges and gave you a sense that the bike pulled harder from 6-9k . My dyno runs showed that too.
I was also using a dyna 3000 ignition on the most advanced setting, nology wires and a custom built "Marks" 4-1 stepped header with a 14" can and a 2.5" baffle.
Google 39mm kehin carbs, see what comes up.
in performance, 2k is alot for me at the moment but ill find it if its worth it. i own my max for 14 years now and its looking and feeling a bit tired.im looking for an affordable(if possible) way to up the hp. any tips would be gratefull.considering i have a lot of work to do with the rest of the bike.
Maybe time for one of my 1300 conversions!
Sean
Sean
hubeerjw
Well-Known Member
And then we could throw some nitrous on it.... O.k. sean, you build the motor and I'll work on NOS system for foxxx....
Foxxx, how much are you looking to spend?
RagingMain
Well-Known Member
Amen to that:biglaugh:
By no means is this every option and it's hard to read in this format. If you want to email me direct I can send the regular spreadsheet. [email protected]
Category Item Part N Stock N QTY Price per piece/unit TTL
Used 1300 Venture/Vmax Engine Core Engine - Miles Vary $600 high miles $1000 low miles 1 $600.00 $600.00
R&R Labor Partial Overhall Engine - Customer R&R from Chassis 1 $200.00 $200.00
Vmax Heads - Low Mile 2 $200.00 $400.00
Vmax Cam Set - Low Mile 4 $50.00 $200.00
Gaskets - Seals - Misc Set 1 $100.00 $100.00
Bead Blast - Engine Paint - Matte or Gloss Black 1 $300.00 $300.00
Solid Engine Mounts Set 1 $75.00 $75.00
ARP head stud kit Set 1 $120.00 $120.00
Subtotal $1,995.00
Optional Upgrades Level 1 - Piston and Rod Kit Ross Racing Pistons 12:1 - Pistons, Rings, Wrist Pins, Locks Set 4 $145.00 $580.00
Cylinder Hone Labor 1 $120.00 $120.00
Recon Rods with Bronze Bushings 4 $60.00 $240.00
Bearings Set 1 $150.00 $150.00
HD overdrive Oil System 1 $100.00 $100.00
Additional Labor 1 $150.00 $150.00
Subtotal $1,340.00
Optional Upgrades Level 2 - Stock Transmission Transmission Undercut 1 $500.00 $500.00
Additional Labor 1 $150.00 $150.00
Subtotal $650.00
Optional Upgrades Level 3 - OD Transmission Overdrive Option Undercut Labor 1 $150.00 $150.00
Fifth Gear Set - OD - new Royal Star Gears 1 $150.00 $150.00
New 2-3 main gear - included in core charge to upgrade trans 0 N/C $0.00
Subtotal $300.00
Misc Upgrades Clutch Plates (Fibers) 8 $13.00 $104.00
Additional Clutch Spring for "DD" mod 1 $36.00 $36.00
$0.00
Ported Heads Pair 1 $600.00 $600.00
Larger Cams Set 1 $700.00 $700.00
HD Springs (recommended with larger cams) Set 1 $130.00 $130.00
Subtotal $1,570.00
Subtotal All Above
$5,855.00
Credit for Good Running Core Engine
-$1,000.00
Total All Above
$4,855.00
Category Item Part N Stock N QTY Price per piece/unit TTL
Used 1300 Venture/Vmax Engine Core Engine - Miles Vary $600 high miles $1000 low miles 1 $600.00 $600.00
R&R Labor Partial Overhall Engine - Customer R&R from Chassis 1 $200.00 $200.00
Vmax Heads - Low Mile 2 $200.00 $400.00
Vmax Cam Set - Low Mile 4 $50.00 $200.00
Gaskets - Seals - Misc Set 1 $100.00 $100.00
Bead Blast - Engine Paint - Matte or Gloss Black 1 $300.00 $300.00
Solid Engine Mounts Set 1 $75.00 $75.00
ARP head stud kit Set 1 $120.00 $120.00
Subtotal $1,995.00
Optional Upgrades Level 1 - Piston and Rod Kit Ross Racing Pistons 12:1 - Pistons, Rings, Wrist Pins, Locks Set 4 $145.00 $580.00
Cylinder Hone Labor 1 $120.00 $120.00
Recon Rods with Bronze Bushings 4 $60.00 $240.00
Bearings Set 1 $150.00 $150.00
HD overdrive Oil System 1 $100.00 $100.00
Additional Labor 1 $150.00 $150.00
Subtotal $1,340.00
Optional Upgrades Level 2 - Stock Transmission Transmission Undercut 1 $500.00 $500.00
Additional Labor 1 $150.00 $150.00
Subtotal $650.00
Optional Upgrades Level 3 - OD Transmission Overdrive Option Undercut Labor 1 $150.00 $150.00
Fifth Gear Set - OD - new Royal Star Gears 1 $150.00 $150.00
New 2-3 main gear - included in core charge to upgrade trans 0 N/C $0.00
Subtotal $300.00
Misc Upgrades Clutch Plates (Fibers) 8 $13.00 $104.00
Additional Clutch Spring for "DD" mod 1 $36.00 $36.00
$0.00
Ported Heads Pair 1 $600.00 $600.00
Larger Cams Set 1 $700.00 $700.00
HD Springs (recommended with larger cams) Set 1 $130.00 $130.00
Subtotal $1,570.00
Subtotal All Above
$5,855.00
Credit for Good Running Core Engine
-$1,000.00
Total All Above
$4,855.00
hubeerjw
Well-Known Member
Don't forget about the NOS...... $900
Giving you a total of:
$5755 and the possibility of hp....
On the 1300 motor alone (Help me out Morley)... 130 rwhp to 150's? depending on upgrades.... then we just throw a little spray on it... maybe a 60 shot and you could be well into the 200 rwhp..... I'm getting wet
Giving you a total of:
$5755 and the possibility of hp....
On the 1300 motor alone (Help me out Morley)... 130 rwhp to 150's? depending on upgrades.... then we just throw a little spray on it... maybe a 60 shot and you could be well into the 200 rwhp..... I'm getting wet
Birdoprey
Well-Known Member
Does your exhaust actually have stepped head tubes?(OD/ID "steps" up to a larger size)
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