rear cylinder probs - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 03-13-2012, 01:25 PM Thread Starter
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rear cylinder probs

ok guys and girls could use some expert advise , rear cylinder was making a weird hissing noise the other day sounded like maybe a burt valve thought i would check timing by watchin valves thu plug holes , looked like timing was close but did notice valves stayed open till about 15 dergee past tdc , tore out engine checked timing but timing show its ok , thought may be the hla s were stuck so removed them and bled them in sea foam seem to be fine .(they felt a little gritty when i first tried but smoothed out second time) thought maybe had an oil passage plugged raising oil presure on hla causing them to over adjust valves keeping valves open longer , blew out oil passages no blockages . any other ideas u may have would be gladly accepted. by the way cleaned carbs so it was running on both cylinders

little red bewitch

96 750 vulcanlittle red bewitch
12561 miles
r/r relocated
leathersaddle bags(take on/ off)
memphis slim windshield (depends on mood)
p/u coils set at .020
agm battery , flame embossed seat cover
drilled clutch hub(3-20-12)
stainless steel coasters (3-28-12)
toc mccts installed(4/3/13)also changed to led bulbs in tail lamp
k&n air filters (4/20/13)
iridium plugs(4/20/13) along with ngk plug caps
V&H pipes, crash bars , luggage rack 4/5/2014
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post #2 of 14 (permalink) Old 03-13-2012, 08:22 PM Thread Starter
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ok up date on my findings looks like cams show proper timing with head and crank lines up with timing mark but marks on chain and middle gear dont jive may be problem got down that far so pulled head and found valves to be in good condition held kerosene all day today

little red bewitch

96 750 vulcanlittle red bewitch
12561 miles
r/r relocated
leathersaddle bags(take on/ off)
memphis slim windshield (depends on mood)
p/u coils set at .020
agm battery , flame embossed seat cover
drilled clutch hub(3-20-12)
stainless steel coasters (3-28-12)
toc mccts installed(4/3/13)also changed to led bulbs in tail lamp
k&n air filters (4/20/13)
iridium plugs(4/20/13) along with ngk plug caps
V&H pipes, crash bars , luggage rack 4/5/2014
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post #3 of 14 (permalink) Old 03-13-2012, 10:07 PM
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If the crank is lined up on the timing mark and the cams are lined up the middle gear should not matter. that is if i understand the way it works, the middle gear is just a 1:1 transfer from crankshaft chain to cam chain. if you turned the engine enough times with everything in time the marks should eventually line up. did it have a miss at all?
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post #4 of 14 (permalink) Old 03-13-2012, 10:34 PM Thread Starter
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no didnt miss both cylinders run just a nasty hiss from exhaust , i checked compession cold and it was 5psi less than front, but after warmed up ran 5 psi higher than front go figure, ran strong

little red bewitch

96 750 vulcanlittle red bewitch
12561 miles
r/r relocated
leathersaddle bags(take on/ off)
memphis slim windshield (depends on mood)
p/u coils set at .020
agm battery , flame embossed seat cover
drilled clutch hub(3-20-12)
stainless steel coasters (3-28-12)
toc mccts installed(4/3/13)also changed to led bulbs in tail lamp
k&n air filters (4/20/13)
iridium plugs(4/20/13) along with ngk plug caps
V&H pipes, crash bars , luggage rack 4/5/2014
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post #5 of 14 (permalink) Old 03-14-2012, 09:03 PM
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Try the "Grambo Trick"....could just be a loose chain. Even with the TOC springs, could be some crud holding back full tension. I had a lot in my tensioners, mostly the rear since it points down. Its like a crud magnet....
Scranton area, eh ?....Howdy from Orange County, NY....




Last edited by Wolfie; 03-14-2012 at 09:08 PM.
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post #6 of 14 (permalink) Old 03-14-2012, 09:14 PM Thread Starter
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could be but im starting to think may be that middle sprocket has more to do with it marks on chain where off buy 4 teeth reset marks and middle gear today . they must have put that timing mark on that middle gear 4 a reason ? waitin on gaskets bummer 67 deg and cant ride

little red bewitch

96 750 vulcanlittle red bewitch
12561 miles
r/r relocated
leathersaddle bags(take on/ off)
memphis slim windshield (depends on mood)
p/u coils set at .020
agm battery , flame embossed seat cover
drilled clutch hub(3-20-12)
stainless steel coasters (3-28-12)
toc mccts installed(4/3/13)also changed to led bulbs in tail lamp
k&n air filters (4/20/13)
iridium plugs(4/20/13) along with ngk plug caps
V&H pipes, crash bars , luggage rack 4/5/2014

Last edited by bow_dude; 03-14-2012 at 09:17 PM.
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post #7 of 14 (permalink) Old 03-14-2012, 09:20 PM
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If you do find it to be the rear ACCT causing your issue, then I personally suggest moving over to MCCTs if possible. I think it's fairly universally accepted around here as a good mod.

Without them I would have never heard the knock from the bad balance dampers (they made the engine so quiet). I feel they saved my engine at this stage, lol. I grabbed mine from TOC, but there are a few manufacturers out there.

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 14 (permalink) Old 03-14-2012, 09:25 PM Thread Starter
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tinking previos owner had some work done to it and didnt get timed right dont think i could jump time even with adjuster removed ,not enough slack to jump timing back had to pull all apart and reset it , thank god for the rebuild videos i saw on here!

little red bewitch

96 750 vulcanlittle red bewitch
12561 miles
r/r relocated
leathersaddle bags(take on/ off)
memphis slim windshield (depends on mood)
p/u coils set at .020
agm battery , flame embossed seat cover
drilled clutch hub(3-20-12)
stainless steel coasters (3-28-12)
toc mccts installed(4/3/13)also changed to led bulbs in tail lamp
k&n air filters (4/20/13)
iridium plugs(4/20/13) along with ngk plug caps
V&H pipes, crash bars , luggage rack 4/5/2014
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post #9 of 14 (permalink) Old 03-14-2012, 09:30 PM Thread Starter
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love the bike but seems to be alot more work than my other bikes i had{good thing i dont mind wrenching on stuff

little red bewitch

96 750 vulcanlittle red bewitch
12561 miles
r/r relocated
leathersaddle bags(take on/ off)
memphis slim windshield (depends on mood)
p/u coils set at .020
agm battery , flame embossed seat cover
drilled clutch hub(3-20-12)
stainless steel coasters (3-28-12)
toc mccts installed(4/3/13)also changed to led bulbs in tail lamp
k&n air filters (4/20/13)
iridium plugs(4/20/13) along with ngk plug caps
V&H pipes, crash bars , luggage rack 4/5/2014
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post #10 of 14 (permalink) Old 04-21-2012, 08:13 PM
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Middle gear is just a transfer/idler...nuthin to do with timing....as long as the mark on the flywheel is at TDC for rear, and the two holes in the cam gears are even with top of cyl edge (holes outward), should be good.
My top and bottom didnt line up perfect. My upper chain had jumped a tooth when not under tension. I removed the ACCT (MCCT in my case) plus the main tension spring just below it. After locking in the two upper cogs in place with 2 punches, I was able to jiggle the flywheel enough to jump it back a tooth. 224 miles since I did that and all seems good.

If'n I could afford the gas to get there, I'd take a ride and help ya out....but yer a good 3.5-4 hrs from me, even speeding. (damn I miss that RT6 !!!!)...



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