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post #1 of 13 (permalink) Old 04-25-2012, 08:27 PM Thread Starter
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ticking or knocking

A couple days ago I accidently tipped my bike over to the right-hand side and I caught it so as it layed over gently. A small amount of gas came out the right carb intake. I picked it up and I let it set about 30 min and then I fired it up. It runs good but now I am hearing a slight, irregular ticking or knocking sound comming from what sounds like the front or middle part of the motor, and it sounds louder on the LEFT side. This only happens after I start it and let it warm up, but after I ride it a few min, it quits again untill I let it get cold or cool down a while. Any suggestions as to what this sound could be? It doesent matter how hot it gets, I can let it idle all day and sound won't go away untill I ride it about 5 miles or so...then I cannot hear it untill it cools down(engine off) for a while. Thanks.

Last edited by kellyjp; 04-25-2012 at 08:35 PM.
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post #2 of 13 (permalink) Old 04-25-2012, 08:42 PM
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My first thought would be the ACCT's. try searching "ACCT" here on vn750 and it might answer your question.

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post #3 of 13 (permalink) Old 04-25-2012, 09:35 PM Thread Starter
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thanks

Thanks, after reading those links, I am 99% sure it's acct on front cylinder. I took off the outside bolt and seen the slotted screw. It did not seem to want to turn, but it was getting dark and I'll take a closer look tomarrow. Thanks again.
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post #4 of 13 (permalink) Old 04-25-2012, 10:04 PM
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You're welcome, and welcome to VN750

1995 VN750 (SOLD)
05-06 CBR600 R/R
ACCT>MCCT mod
engine guard w/HW pegs
Tires, 230's (170/110)
Smaller blinkers
Driving lights
Pickup coil mod
Speedo delete
mirrors w/reverse mount
Black grips

2000 Buell X1 Lightning
Carbon fiber fender F&R
Carbon fiber fly screen
Carbon fiber race intake
Works Shock
V&H Muffler
SS headers

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post #5 of 13 (permalink) Old 04-25-2012, 10:19 PM
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Quote:
Originally Posted by kellyjp View Post
Thanks, after reading those links, I am 99% sure it's acct on front cylinder. I took off the outside bolt and seen the slotted screw. It did not seem to want to turn, but it was getting dark and I'll take a closer look tomarrow. Thanks again.
Should turn easy clockwise, wind it up and let it spring back and then it shouldn't turn counter-clockwise. I just went MCCT today and I can tell a big difference over my old worn out ACCT on the front. Rear didn't make much that much difference in the cam chain noise...

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post #6 of 13 (permalink) Old 04-26-2012, 04:18 PM
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did mcct on front cylinder on mine and noise went awy.now rear cylinder is noisy.my girl aint happy unless i am working on her.lol

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post #7 of 13 (permalink) Old 04-26-2012, 10:59 PM
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my girl aint happy unless i am working on her.lol
Haha, I feel the same way with my scoot.

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post #8 of 13 (permalink) Old 04-28-2012, 09:35 PM
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My petcock click and clangs like crazy. Its the little diapragm thingy. Mine is an 85. I dont think the newer ones have the vacuum operated petcocks. Really clanky with a low tank
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post #9 of 13 (permalink) Old 04-28-2012, 10:13 PM
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Quote:
My petcock click and clangs like crazy. Its the little diapragm thingy. Mine is an 85. I dont think the newer ones have the vacuum operated petcocks. Really clanky with a low tank
the newer petcocks operate off of vacuum as well... just for an fyi
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post #10 of 13 (permalink) Old 04-29-2012, 01:48 AM
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Quote:
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My petcock click and clangs like crazy. Its the little diapragm thingy. Mine is an 85. I dont think the newer ones have the vacuum operated petcocks. Really clanky with a low tank
Quote:
Originally Posted by slimvulcanrider View Post
the newer petcocks operate off of vacuum as well... just for an fyi
slim is right. All vn750 petcocks are vacuum operated.
But only the early models from 1985 to `88 (IIRC) have a "Prime" position that will fill the carbs without vacuum.
From 1989 models and later the "prime" position was changed to an "OFF" position.
However all petcocks are interchangeable, and early or late model petcocks can be installed on any model of the 21 years of production from 1985 to 2006.
The rebuild kits available on Ebay will work on all vn750 petcocks of either style too.

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