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post #1 of 16 (permalink) Old 11-29-2010, 11:25 PM Thread Starter
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Tuning Options for a VN750

My '01 runs pretty strong. Test drove a VN750 a while back that was smooth running but seemed to be off in the HP department. The low end wasn't there. Could that be a tuning preference or something wrong with the engine?

'01 Vulcan 750
Irridium Plugs
MF Battery
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post #2 of 16 (permalink) Old 11-29-2010, 11:45 PM
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sounds like it might be hitting only on the rear cylinder.. very common problem, and an easy fix... usually
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post #3 of 16 (permalink) Old 11-29-2010, 11:51 PM
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It depends if the bike you drove has been properly maintained such as the carbs kept clean, plugs checked or replaced regularly, battery fully charged, oil changes, etc... Mostly the carbs, if they are clogged with tarnish that will make a bike sluggish and seem powerless.

Have you done any other mods besides the plugs and battery?

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #4 of 16 (permalink) Old 11-30-2010, 12:38 AM
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Quote:
Originally Posted by hctublerub View Post
My '01 runs pretty strong. Test drove a VN750 a while back that was smooth running but seemed to be off in the HP department. The low end wasn't there. Could that be a tuning preference or something wrong with the engine?
Quote:
Originally Posted by baldy View Post
It depends if the bike you drove has been properly maintained such as the carbs kept clean, plugs checked or replaced regularly, battery fully charged, oil changes, etc... Mostly the carbs, if they are clogged with tarnish that will make a bike sluggish and seem powerless.

Have you done any other mods besides the plugs and battery?
It is a bike he was test driving that is low on power, not his own.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 11-30-2010 at 12:43 AM.
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post #5 of 16 (permalink) Old 11-30-2010, 12:57 AM Thread Starter
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I took the bike up to speed and hit 90. Maybe I could have gone faster. It was when I downshifted the power wasn't there. With my '01 I can pass in 5th gear but with this bike you had to down shift and 4th was weak. If you were just cruising it wouldn't be a problem. I've never know a used bike that didn't need a trip to the shop after you bought it for one reason or another.

'01 Vulcan 750
Irridium Plugs
MF Battery
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post #6 of 16 (permalink) Old 11-30-2010, 11:08 AM
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Quote:
Originally Posted by OlHossCanada View Post
It is a bike he was test driving that is low on power, not his own.
True but if he has modified his bike and the other is stock that would make the test rode bike feel less powerful as well as how it was maintained.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #7 of 16 (permalink) Old 11-30-2010, 11:28 AM
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Quote:
Originally Posted by baldy View Post
It depends if the bike you drove has been properly maintained such as the carbs kept clean, plugs checked or replaced regularly, battery fully charged, oil changes, etc... Mostly the carbs, if they are clogged with tarnish that will make a bike sluggish and seem powerless.

Have you done any other mods besides the plugs and battery?
What do you do to keep the carbs clean? I bought a 94 with only 13K miles so its likely it spent some time sitting with bad California gas in it. I haven't riden any other 750's so I couldn't tell you if it has the right amount of power or not.

-Robert
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post #8 of 16 (permalink) Old 11-30-2010, 12:00 PM
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Lots of folks here swear by Sea Foam. You can try draining the fuel from the carbs and refilling with straight Sea Foam and letting it sit for a day or two. Then drain the Sea Foam from the carbs. Add 1/2 can of Sea Foam to a full tank of fresh gas and ride it like you stole it. Repeat with a second tank of Sea Foam treated gas is needed. If the carbs are still dirty, probably need to pull, disassemble, and clean thoroughly.

Depending on how much you ride, you may want to add 2-3 ounces of Sea Foam to every 3-4 tanks of gas for maintenance. Sea Foam is also an excellent fuel stabilizer and doesn't have a shelf life like Stabil.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #9 of 16 (permalink) Old 11-30-2010, 12:01 PM
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Quote:
Originally Posted by RobertGary1 View Post
What do you do to keep the carbs clean? I bought a 94 with only 13K miles so its likely it spent some time sitting with bad California gas in it. I haven't riden any other 750's so I couldn't tell you if it has the right amount of power or not.

-Robert
To clean the carbs, get a bottle of Seafoam at your local auto parts store, fill the tank and add a good dose of the seafoam more then the recommended dosage, start the bike and run it for several minutes to get the seafoam into the carbs, shut the bike off and let it set for 24 to 48 hours. This should clean some of the crud out of the carbs and as you ride, use the seafoam at regular intervals as directed. This is not a cure all for more serious carb problems, it is just to clean the sediments left by the fuel.


You beat me to it flite. lol

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #10 of 16 (permalink) Old 11-30-2010, 12:04 PM
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Quote:
Originally Posted by baldy View Post
You beat me to it flite. lol
It's unanimous! Use Sea Foam!

Baldy, I'm usually the slow typist who comes in last!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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