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post #1 of 45 (permalink) Old 03-15-2011, 10:00 AM Thread Starter
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New used bike, new problems

So i bought a '97 VN750 last night for 1300.
in great shape, and I met the shop owner who rebuilt it in San Marcos, TX.

After riding, I notices the throttle acts a bit weird...
It seems to rev up pretty quickly, then do nothing at all.
This makes it incredibly hard to roll out of a stop going uphill without stalling.

Additionally, the bike wouldn't go over 70 on the ride home, nor did it have ANY pickup over 45mph.

My first guess is the battery or the carbs? The previous owner said the bike had been sitting since January before he got the drive shaft replaced, and the mechanic told me i needed to replace the battery soon.

Could these issues simply be side-effects of a dying battery, or to I need to pull the tank off and have a mechanic tinker around before i take her out?
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post #2 of 45 (permalink) Old 03-15-2011, 10:15 AM
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It sounds like air/fuel mix issues. That's pretty broad, but I would start with trying to do a good ride once the bike is warmed up and then pulling the plugs and getting a good look. If they're wet and black, then the mixture is rich with fuel. (too rich) If they are white (ish) then the mix is too lean (not enough fuel). That's a good place to start. I'm leaning (no pun intended) to the lean mix side on this one, maybe with vacuum leaks or air filters missing or not correctly oiled. These things can be caused by poor fitting of the carb boots or cracked vacuum lines, etc. Start with the plugs and see if it points to anything and check back with the forum... You can pull them and check them cold too, which probably isn't a bad idea, then if they look normal, try the ride and kill the engine with the kill switch so you get a good read on the plugs.

One caution, if it is running lean, it can burn the valves pretty quickly so I wouldn't keep riding it until we figure it out.

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2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
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post #3 of 45 (permalink) Old 03-15-2011, 10:53 AM
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First-I agree with Fergy, it sounds like air/fuel mixture issues... but---
So you need a new battery why not go ahead and get a new MF battery (don't think that will cure it but) then give the gas a good dose of SeaFoam... Do the warmed up ride as Fergy suggests, and as much as you feel comfortable with...
If that don't help, then exactly as Fergy says above... That way all adjustments will be done with cleaned up carbs and more than likely be final, adjustments done on varnished up carbs will usually have to be repeated and sometimes several times as the carbs clean up...
Have a good one...Old Dog...

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Last edited by Old Dog; 03-15-2011 at 10:55 AM.
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post #4 of 45 (permalink) Old 03-15-2011, 11:04 AM Thread Starter
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Is SeaFoam an octane booster?
Sorry for sounding like the newb I am. I'm not a skilled mechanic by any means, and I've only been riding a little over 2 years, so I may not be too familiar with some terminology.

And MF battery? Maintenence free? And can I find one at auto zone?
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post #5 of 45 (permalink) Old 03-15-2011, 11:31 AM
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I sometimes forget to mention Seafoam since I use it all the time, ha! But definitely get you a couple cans and after the initial quarter can dose or even more in a full tank, use about 3 oz at a fill up per month for preventive maintenance. Seafoam is a cleaner, fuel stabilizer. It really can clean out a lot of gum and varnish, and can attach its self to water and get it burned through.

The reason I was leaning to the lean side was the high revs and weak power, together a sign of an air leak. If your battery is not a maintenance free you need to replace it with one as soon as possible. You don't have to check water levels which is a big plus considering the pain it is to remove the seat, and they have more cold cranking amps than the same sized wet cell so it is a win-win, and they last longer too, and don't lose as much charge sitting in the bike when you're not riding it...

Thanks Old Dog for the reminder!

Fergy
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Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
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post #6 of 45 (permalink) Old 03-15-2011, 12:20 PM Thread Starter
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Awesome, So can i pick up a battery and SeaFoam at Autozone or any similar auto parts store?
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post #7 of 45 (permalink) Old 03-15-2011, 12:27 PM
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I've never bought a battery at autozone, but you can definitely buy seafoam there. The last battery I ordered from the net, was a big crank I believe that someone posted a link to here somewhere. Just take the old battery with you so you can match size and cable orientation and you should be good, if they have them.

Fergy
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2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
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post #8 of 45 (permalink) Old 03-15-2011, 01:08 PM
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Quote:
Originally Posted by PhayzR View Post
After riding, I notices the throttle acts a bit weird...
It seems to rev up pretty quickly, then do nothing at all.
This makes it incredibly hard to roll out of a stop going uphill without stalling.

Additionally, the bike wouldn't go over 70 on the ride home, nor did it have ANY pickup over 45mph.
Being more of a conspiracy theorist, if seafoam and mix adjustments don't cure it, you might want to consider whether the spark is getting advanced by the ignitir IC. I wish I knew how to test that ...

Good hunting.

~~C8> Ratt
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post #9 of 45 (permalink) Old 03-15-2011, 01:29 PM
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Deka and I think Big Crank (may be Westco) batteries are made by East Penn battery company here in the US and are good quality. If I wasn't lazy, I'd get the number off my battery and give you the ebay link for Deka. Beware Chinese made batteries!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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1989 VN750 acquired December, 2008, 6,711 miles
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post #10 of 45 (permalink) Old 03-15-2011, 01:34 PM
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Quote:
Originally Posted by PhayzR View Post
Awesome, So can i pick up a battery and SeaFoam at Autozone or any similar auto parts store?
you can get both at walmart.. just get the right size MF battery.. they have 2 differnt sizes that I have seen.
Also as stated above... check all of your hoses and boots for leaks...try useing WD40 sprayed around them if the engine stubels or reves then you know you got a leak there... what is your idle setting at on the Tac? does it bounce around at idle?.. look at the carbs next to the vent nipples on the sides.. is the plug still in the air/fuel mix hole?.. if not then take a small screw driver and turn them all the way in then back them out 2.5 turns...
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