I have produced a knock - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 08-11-2015, 07:38 PM Thread Starter
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I have produced a knock

Well I have a knock in my front cylinder. I thought it was a exhaust leak but it now sounds like a knock. Any clue what this could be? I can't see the oil in the window because the glass is cloudy but it might be low on oil as that may cause a knock.

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post #2 of 23 (permalink) Old 08-11-2015, 07:46 PM
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Can't really move forward without the basics like oil level.

Hydrolic lifters means no rods, so didn't throw one of those.

You can use a screwdriver as a stethoscope to try to diagnose location.

Also are you sure it isn't balance dampers?

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post #3 of 23 (permalink) Old 08-11-2015, 07:53 PM
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Quote:
Originally Posted by thtanner View Post
Can't really move forward without the basics like oil level.

Hydrolic lifters means no rods, so didn't throw one of those.

You can use a screwdriver as a stethoscope to try to diagnose location.

Also are you sure it isn't balance dampers?
Um,uh,if there are no rods,what connects the piston to the crankshaft?hint-it ain't the knee bone.is it high up on the motor(acct) or on the front lower left side by the stator(crank balancer bushings)?

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post #4 of 23 (permalink) Old 08-11-2015, 10:22 PM
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Richard, have you checked to see if it is an ACCT??? Mine was knocking-more like tapping-when I got it. Tried the Grambo and found out it was the ACCT. Easy and cheap fix too.

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post #5 of 23 (permalink) Old 08-11-2015, 10:46 PM
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I almost think a sig line with what work you've done to the bike may be as important as an intro post. Hard to keep track of who has manual and auto tensioners, etc.

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

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post #6 of 23 (permalink) Old 08-11-2015, 10:48 PM
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Quote:
Originally Posted by OleDirtyDoc View Post
Um,uh,if there are no rods,what connects the piston to the crankshaft?hint-it ain't the knee bone.is it high up on the motor(acct) or on the front lower left side by the stator(crank balancer bushings)?
Push-rods is specifically what I meant, sorry to not have been dictionary specific. Swear ours didn't have them but I haven't rewatched Roach's videos in quite a bit.

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 #7 of 23 (permalink) Old 08-11-2015, 10:55 PM
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I think if it was due to oil, you would see the oil light flashing, or on steady.

Harbor Freight has a decent stethoscope for about $3.99.

Sometimes, you can feel a knock or tap, try touching the back of the ACCTs or the mounting bolts.

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post #8 of 23 (permalink) Old 08-12-2015, 10:20 AM
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Well to me there's a difference between a "knock" and a "tap"....a knock is a lower frequency sound...like taking a hammer and hitting a more solid part of the motor...and a "tap" would be a higher frequency sound...like loosely holding a long screwdriver and bouncing the end off a less solid part (like a cooling fin)
ACCT noise is considered a tapping sound...like a noisey sewing machine.

You've started many threads about different issues you've had with the bike, so sorry if I can't remember them all... But didn't you have a problem with a leaky carb and reported you had fuel in your oil?

I'd also say not sure how wise it is to run the bike if you have no idea how much oil it has in it. You also don't have a location listed, which could be helpful as a close member might be able to run by and check your bike first hand.

Generally a "knocking sound" is not a good thing...
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post #9 of 23 (permalink) Old 08-12-2015, 07:31 PM Thread Starter
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I tried the Grambo Trick but the screw wouldn't turn at all. What do I need to do now?

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post #10 of 23 (permalink) Old 08-12-2015, 07:39 PM Thread Starter
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ok I watch the video and found that the screw that I thought was a screw was actually not designed to turn. So I guess I need a smaller screwdriver to turn the tensioner.

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Richard
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