grinding noise on decel - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 04-24-2012, 12:27 AM Thread Starter
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grinding noise on decel

Not sure exactly where its coming from, but when i ride i can hear a ginding-ish noise when i apply throttle. when i release throttle it goes away. im not even sure where to start. i looked up the coffee grinder noise, but it says that goes away once engine is warmed up. i was still hearing this after a half an hour ride with warm up. not sure it happens at full throttle due to loud pipes. cant hear it because of those at higher rpms. Also i am getting lower gas mileage around 40mpgs. I have recently put in iridiums and switched to mccts. trying to give enough background as i see needed. Thanks for all the help Mick.
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post #2 of 9 (permalink) Old 04-24-2012, 06:35 AM
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do you hear it at idle? is it coming from the engine, or that back of the bike? A member once posted with a similar noise coming from the right side of the bike, and he traced it to the little loop shaped heat shield... the rivet had broken.
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post #3 of 9 (permalink) Old 04-24-2012, 08:11 AM
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Have you checked the final drive splines? Not sure if the sound fits with normal symptoms of the drive shaft being damage, but its certainly worth a look.

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*2014 VN900 Custom (16,200 miles and counting)
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post #4 of 9 (permalink) Old 04-24-2012, 11:25 PM Thread Starter
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Took it for another ride today. I couldnt hear it at idle but it was there again while riding. It sounds like it is coming from beloe the tank. I looked around and didnt see anything loose. I havent checked the splines, but it doesnt seem like that to me. Thanks Mick.
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post #5 of 9 (permalink) Old 04-25-2012, 12:22 AM
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I'd check the splines, just in case. You don't want to end up stranded and looking for a $200+ part on eBay.

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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post #6 of 9 (permalink) Old 04-25-2012, 11:39 AM
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How old is your bike? Some of the early models, especially if they sat for a while, have the balance rubbers disentigrate. If it goes too long, the balancer comes out through the lower left crankcase. See project bike notes in my sig.

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 #7 of 9 (permalink) Old 04-25-2012, 11:54 AM
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Quote:
Originally Posted by flitecontrol View Post
How old is your bike? Some of the early models, especially if they sat for a while, have the balance rubbers disentigrate. If it goes too long, the balancer comes out through the lower left crankcase. See project bike notes in my sig.
Just to add some notes to this. When you see the dampers begin to disintegrate, you'll notice black plastic flecks on your oil screen. Also, it can cause a 'knock' noise at idle.

Requires an engine tilt/pull. They're behind the rotor which is behind the stator.

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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post #8 of 9 (permalink) Old 04-25-2012, 04:50 PM Thread Starter
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Its an 85, so it doesnt get any older than that for our bikes. Is the only way to check them by looking for plastic in the oil or is there another way. Also whats a ballpark for skill and money needed to do this. Thanks Mick.
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post #9 of 9 (permalink) Old 04-25-2012, 08:38 PM
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Here is a picture in the gallery of the balancer gear chewing into the case:
https://www.vn750.com/photopost/showp...to=294&cat=505

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
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