running temp question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 02-10-2014, 12:30 PM Thread Starter
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running temp question

so i got this new bike it needs some work it runs and everything but needs a carb clean and shift linkage i also noticed a few things like while it was running the front cyclinder exhaust was very hot and the back was only warm the pipe one the front is rain bowed pretty heavy but the back is not does the front run hotter is that normal
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post #2 of 14 (permalink) Old 02-10-2014, 01:08 PM
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I'm not sure but mine is like that too. My carbs are synched as well and the front seems to thump a little harder than the rear and runs a bit leaner I think. Try adjusting the air mix screw. Screw it all the way in, then 2.5 turns out. Turning it out (counter clockwise) DECREASES the amount of oxygen. (check me on this one boys)

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post #3 of 14 (permalink) Old 02-10-2014, 04:14 PM
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Quote:
Originally Posted by Goofyfoot2001 View Post
I'm not sure but mine is like that too. My carbs are synched as well and the front seems to thump a little harder than the rear and runs a bit leaner I think. Try adjusting the air mix screw. Screw it all the way in, then 2.5 turns out. Turning it out (counter clockwise) DECREASES the amount of oxygen. (check me on this one boys)
Sounds VERY logical to me......


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post #4 of 14 (permalink) Old 02-10-2014, 08:17 PM Thread Starter
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it was just something i noticed im glad someone else did too
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post #5 of 14 (permalink) Old 02-10-2014, 08:24 PM
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While a slight difference between cylinders is normal the difference you're discribing is pretty severe, probably more than the air mix screw is going to fix. I'd sispect that the slow jet for your front cylinder is partially plugged. That of your float level is off a tad.

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post #6 of 14 (permalink) Old 02-10-2014, 08:45 PM
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Dunno if anyone here has tried it, but on one of my Harleys when one cyl was runnin hot, I dropped down a number on my spark plug (colder plug)....worked like a charm...

And my front cyl always ran a lil hotter (on both motors)....could be because its shielded from the oncoming wind by the radiator....hmmm....I may design a set of fins to channel air in right behind the radiator....easy enough to do....



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post #7 of 14 (permalink) Old 02-10-2014, 09:20 PM Thread Starter
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While a slight difference between cylinders is normal the difference you're discribing is pretty severe, probably more than the air mix screw is going to fix. I'd sispect that the slow jet for your front cylinder is partially plugged. That of your float level is off a tad.
your prolly right on that it def needs a carb clean the first thing i noticed was the rainbowing on the pipe

"So, Doc, look at this engine. I open its heart, take valves out, fix 'em, put 'em back in and when I finish, it works just like new. So how come I get such a small salary and you get the really big bucks, when you and I are doing basically the same work?"

The surgeon paused, smiled and leaned over and whispered to the mechanic ...

"Try doing it with the engine running!"
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post #8 of 14 (permalink) Old 02-10-2014, 09:29 PM Thread Starter
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Dunno if anyone here has tried it, but on one of my Harleys when one cyl was runnin hot, I dropped down a number on my spark plug (colder plug)....worked like a charm...

And my front cyl always ran a lil hotter (on both motors)....could be because its shielded from the oncoming wind by the radiator....hmmm....I may design a set of fins to channel air in right behind the radiator....easy enough to do....
ill have to get the carbs done up and try that this is only my 2nd v twin bike so im kinda figuring some stuff out as i go here but wat you said makes sense you got some time before spring design away we are expecting 8 inchs of snow here in the next couple days so mines goin in the baesment/mancave/bikeshop

"So, Doc, look at this engine. I open its heart, take valves out, fix 'em, put 'em back in and when I finish, it works just like new. So how come I get such a small salary and you get the really big bucks, when you and I are doing basically the same work?"

The surgeon paused, smiled and leaned over and whispered to the mechanic ...

"Try doing it with the engine running!"
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post #9 of 14 (permalink) Old 02-11-2014, 01:02 PM
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Yea sounds like the cyl. is flooded. Same happened to a lot of people and it's usually the side it leans on while on the kickstand. Try Seafoam in the gas, drain the bowl & shoot some carb cleaner in there or try back flushing the carbs before you tear it apart. You can also try lightly tapping on the float housing with the handle of a screwdriver.

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post #10 of 14 (permalink) Old 02-11-2014, 01:20 PM
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ill have to get the carbs done up and try that this is only my 2nd v twin bike so im kinda figuring some stuff out as i go here but wat you said makes sense you got some time before spring design away we are expecting 8 inchs of snow here in the next couple days so mines goin in the baesment/mancave/bikeshop
I am around a number of different bikes. The exhaust pipe discoloration is a sign of lean, however it is not necessarily lean now. After it is/was fixed the pipes will stay blued unless fixed.

Wolf posted a pic of some borderline lean plugs, I think in response to another of your posts/threads.

Pipe discoloration typically is always a pilot circuit lean condition. Typically partially plugged jet/passages.

edit- a lean cylinder will run hotter.
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