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post #1 of 15 (permalink) Old 09-21-2018, 10:11 PM Thread Starter
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Hello everyone, I have recently bought a 97 VN 750 it's a great looking bike but I have noticed a few issues with it, I'm leaning towards the cards need cleaned and jetted, the bike idles up as soon as you put it on the kickstand with the tire straight, It keeps fouling out the left rear plug only.
I replaced all the plugs the p/o put in it, it was odd he had 1 Hotter plug in the front left than the rest, he had also changed the oil over to rotilla, I'm not sure on that one, I have seen mixed reviews and I won't start an oil thread lol...

I also noticed the past two times I ride it after it got up to temp the bike is harder to switch gears,
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post #2 of 15 (permalink) Old 09-21-2018, 10:41 PM
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Originally Posted by Joey Persons View Post

I also noticed the past two times I ride it after it got up to temp the bike is harder to switch gears,
Check for gas in the oil. Does the oil smell like gas? Are there vapors coming from the oil fill hole when it's hot? (not running)

Make sure the oil is at the correct level, aeration from being too full can make the shifter sticky.

Rotella is great, never heard a bad thing about it.

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post #3 of 15 (permalink) Old 09-22-2018, 07:01 AM Thread Starter
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The oil does have a slight smell but more like exhaust than fuel, as to the oil level the oil fills up the sight glass while standing up or leaning on kick stand.
The P.O. said he did a fresh oils change the oils color is a light tea color, the odd thing is the fouling of just the left rear plug only, and the idle when it leans left, I double checked all the plug gaps and plug wires. But I did notice that the left rear pipe is not getting very hot, not sure if everything is centered around the carbs or not,
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post #4 of 15 (permalink) Old 09-22-2018, 07:09 AM
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Rotella is AOK to run in these bikes, many do it without issue.

Oil level should be checked on center stand (bike straight up, not leaning), and should be just below top of glass (about 1/4 inch)

left rear pipe is the pipe for the rear cylinder. both exhaust ports on the cylinders dump into their respective exhaust manifolds (all exhaust from rear cylinder goes out the left rear of engine). if its not as hot, its not burning as well as front. this does sound like a carb problem

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post #5 of 15 (permalink) Old 09-22-2018, 09:51 AM
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Possibly the float height on the rear carb is too high.

Sounds like it has too much oil.

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post #6 of 15 (permalink) Old 09-23-2018, 06:18 PM Thread Starter
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Joey Persons

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2 days ago* #1

New to the forum

Hello everyone, I have recently bought a 97 VN 750 it's a great looking bike but I have noticed a few issues with it, I'm leaning towards the cards need cleaned and jetted, the bike idles up as soon as you put it on the kickstand with the tire straight, It keeps fouling out the left rear plug only.
I replaced all the plugs the p/o put in it, it was odd he have 1 Hotter plug in the front left than the rest, he had also changed the oil over to rotilla, I'm not sure on that one, I have seen mixed reviews and I won't start an oil thread lol...

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about 8 hours ago* #2

Rottella is highly recommend here, and on other forums.
It would make more sense to use a hotter plug in the rear, but just guessing the OP had to use it just because the right one wasn't available?
We also recommend the iridium plugs.
Oh yeah, Welcome to the Forum !

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Thanks everyone for the feed back, now I experienced a different problem today when riding to work I stopped at a light then the idle shot up to about 4500 and would not go down , I check the cables and the handle nothing stuck , Reeved it a little higher and it stopped, went about 200 yrds to the next light it did it again, I know I'm having some cars issues, but it seemed like they all went away when I started it, it ran like a dream and it was like the engine just came to life with a new found power then bam when I hit the light it started going bonkers, the light it happens at is about 3 miles from my house
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post #7 of 15 (permalink) Old 09-23-2018, 06:54 PM
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Could be running on one cylinder (requires the idle to be set higher). When the dead cylinder kicks in intermittently, the idle setting is way too high.

The fouling plug, gassy oil, sticky shifter, etc., could all be because that rear carb is flooding most of the time.
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post #8 of 15 (permalink) Old 09-23-2018, 09:14 PM
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Check for a sticky float needle as well. Look up Wolfie's back blow method in the sticky section of the card & fuel system board on here

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post #9 of 15 (permalink) Old 09-26-2018, 07:52 AM
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Check for air leaks around the carb boots. Cracks or loose intake boots can cause the rpms to rise or stick.

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post #10 of 15 (permalink) Old 09-26-2018, 02:55 PM
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Clean the ignition switch

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