Noise on take off - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 05-23-2015, 08:17 PM Thread Starter
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Noise on take off

I've put about 1200 miles on my VN so far and the only thing that it does that doesn't seem right is that when you go to take off, especially when cold starting off, it makes a "brrruhh" noise. It sounds almost exactly like a hydrostatic mower taking off and the pump grunts at you. It only does it for a quick second and then it quits. Doesn't do it shifting gears or hitting throttle in 1st. I can't tell where it's coming from. Not really sure what it is. If my super awesome description doesn't do it, I can get a vid of it making the noise tomorrow. Happens every day.


2006 Vulcan 750
Bone Stock
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2000 Honda XR650L
Wiseco 10.4:1
Pirelli Scorpions
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post #2 of 6 (permalink) Old 05-23-2015, 08:42 PM
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Originally Posted by AndrewGilbert View Post
I've put about 1200 miles on my VN so far and the only thing that it does that doesn't seem right is that when you go to take off, especially when cold starting off, it makes a "brrruhh" noise. It sounds almost exactly like a hydrostatic mower taking off and the pump grunts at you. It only does it for a quick second and then it quits. Doesn't do it shifting gears or hitting throttle in 1st. I can't tell where it's coming from. Not really sure what it is. If my super awesome description doesn't do it, I can get a vid of it making the noise tomorrow. Happens every day.
Do a search for " coffee grinder syndrome ". Very common. Also check this https://www.vn750.com/forum/showthrea...inder+syndrome

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier

Last edited by JM2001; 05-23-2015 at 08:45 PM.
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post #3 of 6 (permalink) Old 05-23-2015, 08:54 PM Thread Starter
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Thanks, JM2001! That's it exactly. I believe I'll do a thorough oil change and see if it improves. If that doesn't do the trick I'll do the mod. I thought it may be the clutch but I just couldn't put my finger on where the noise was coming from. The guy I bought it from said he did an oil change at 1600 with Lucas; it may not be a great fluid for the clutch.


2006 Vulcan 750
Bone Stock
=======
2000 Honda XR650L
Wiseco 10.4:1
Pirelli Scorpions
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post #4 of 6 (permalink) Old 05-23-2015, 09:06 PM
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Originally Posted by AndrewGilbert View Post
Thanks, JM2001! That's it exactly. I believe I'll do a thorough oil change and see if it improves. If that doesn't do the trick I'll do the mod. I thought it may be the clutch but I just couldn't put my finger on where the noise was coming from. The guy I bought it from said he did an oil change at 1600 with Lucas; it may not be a great fluid for the clutch.
Before doing an oil change put about 4 ounces of SeaFoam into the crankcase. Warm up the engine at idle for about 10 minutes then ride the bike for about 10-15 miles. Drain the oil and put in a good motorcycle oil. I use Castrol 4T 20-50 motorcycle oil. I got rid of the coffee grinder noise.

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
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post #5 of 6 (permalink) Old 05-24-2015, 09:35 AM
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X3 on coffee grinder.

It can also help to work the clutch lever a few times while it's warming up, before you take off.

Seafoam: Come to think of it, I haven't seen coffee grinder this season, last year I ran a dose of Seafoam for 200-300 miles, because I thought it might have a sticky intake valve. Seems like both problems are gone now.

Long story but ... Coffee grinder dumped me on my butt the first year I rode mine. Be careful with it. Previous owner got dumped too.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
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post #6 of 6 (permalink) Old 05-24-2015, 02:56 PM
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As Sprockster said, work the clutch lever a bit before taking off (while it's warming up). First few takeoffs I just let it out real easy. No oil changes etc made it ever go away completely. I'll be drilling holes in the basket this summer when I'm swapping the plates and springs for a perm fix.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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