1998 vn750 debate - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 02-21-2010, 05:54 PM Thread Starter
 
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1998 vn750 debate

Hi! I am just new to this forum and really indeed need of help. I was debating if I am going to buy this 1998 vn750 which was originally came from Washington State. I am currently residing here in Hawaii and wanted to jump into cruisers. I used to ride a sportsbike and all of them was all a liter bike.

To start of, I am really debating of buying this '98 vn750 for the reason that it has some problems right now which are the following:
the bike pops a lot (backfiring)
won't idle below 2500 rpm but after warm up it will
bike seems to lacks of power (don't know if compression related)
rode it in high rpm's but still pops a lot (it pops under the tank and to the exhaust)
broken coolant reservoir
but other than that everything is ok and all accessories are working
typical 12 yrs old bike with some minor rust and dull surfaces
also has an aftermarket pipes which I guess a straight slash cut pipes

The guy is selling the bike for $750 but able to bring it down to $550 which I think is already a good deal. I am just really concern of the poor throttle response and the excessive popping both while idling and riding. I already read some articles from this forums about the problem and all were directly pointing to carburator cleaning and marbling the air system.

I am looking forward to hear you comments and advises.

Last edited by 98vn750; 02-21-2010 at 05:59 PM.
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post #2 of 7 (permalink) Old 02-21-2010, 06:15 PM
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You definately need to get the carbs reworked and rebuilt first. You can read the thread about the guy that rebuilds carbs at a resonable price. He is at www.carbworx.com, this is if you do not think you can do it yourself. Also you need to read some threads about how to remove and reinstall the carbs on this bike, can be difficult.

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post #3 of 7 (permalink) Old 02-21-2010, 06:21 PM
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for 550 bucks you can't go wrong...even if you were to say part it back out (not an option I like to go but just throwing that out there) but all the problems listed are typical problems with easy fixes with little to no cash out of pocket. the lack of power could be carb issues, or it could be that it is only running on one cylinder. these bikes are peppy little machines, and I love mine... as do most VN750 Owners.
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post #4 of 7 (permalink) Old 02-21-2010, 08:49 PM
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The popping is typical of most Vulcan 750's and is not a problem normally. The lack of power IS definitely a problem but might be very easily fixed by cleaning the fuel system and changing out the air filters, and probably changing out the spark plugs and wires In all, I'd say the price is darn good and you will love your bike once you tune it up.

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post #5 of 7 (permalink) Old 02-21-2010, 09:20 PM
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A good part of the running issues are almost certainly carb related, and can be complicated by the aftermarket exhaust system which will cause a lean air/fuel mixture if the carbs are not rejetted to compensate, which could be the cause of the backfiring. Also, at near sea level, the idle mixture screws need to be turned out to 2 1/2 -3 turns. Factory setting is 1 1/2 turns out, but that is too lean for low altitude use. The other thing you can do is to remove the complete air injection and CA evap emissions crap. The air injection system causes the exhaust to run hot, and can also cause backfiring.

It sounds to me like the bike just needs some sorting out. You didn't say how many miles it has on it, but if you buy it, and I would, based on your description and picture, AND assuming it hasn't been crashed (I won't buy a crashed bike other than for parts, to much danger of frame damage), you will also need to do a spline lube, and check the cam chain tensioners. to much play in the cam chain can affect valve timing and also cause a loss of power, and backfiring. Unfortunately, there is no easy way to check the cam chains for excessive wear until after you buy the bike, and that is not an easy fix. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #6 of 7 (permalink) Old 02-21-2010, 10:07 PM Thread Starter
 
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well thanks for everything guys... here's an update, I went to check the bike thoroughly and found out couple problems again, I am pretty sure that this one could cause the engine to backfire, I found out that the bolt holding the pipe is broken (missing head) so there's no way to tighten it and the rest of the bolts are all rusted which I think will lead to a big fiasco, second the front wheel is off alignment, if you try to straighten the handle bar the bike will veers to the right. I think the bike had a front end accident which causes alignment to be off. I don't know now if I still going to buy it probably save my money and wait for a better one.

22k mileage on the bike...

Last edited by 98vn750; 02-21-2010 at 10:13 PM.
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post #7 of 7 (permalink) Old 02-21-2010, 10:45 PM
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If you believe it has been crashed, then yes I would avoid it. Crashed bikes are always a gamble, no matter how low the price is, because they can have damage far beyond what you can see. Also avoid bikes with salvage titles. Many sellers on Craigslist seem to think a salvage title is not a big deal, but it is. In my state anyway, the only way to get one is for an insurance company to write the bike off as a total loss. Sometimes with sporbikes, seriously damaged bodywork can cause that to happen, while the bike is mechanically ok, the broken bodywork having protected the frame and engine. Sportbike frames are also a lot stronger than cruiser frames.

I have owned a couple of liter class sportbikes, including a Kawasaki ZX11. They were fast, but simply to uncomfortable for me. I have owned 44 bikes total, including an '84 Goldwing and a '86 Yamaha Venture. Believe it or not, the Vulcan 750 is the most comfortable of them all, for me. I have put more mileage on Vulcan 750s that any other single model, a total of over 123,000 miles on 2 of them.

You will not regret buying a Vulcan 750 in good condition. Not only are they comfortable, but they are fast for a 750 cruiser, in fact they will outrun many cruisers twice their size, including any stock EVO powered Harley, and Kawasaki's own Vulcan 1500 Classic. They also handle very well for a cruiser. The only thing they are not good for is long distance 2 up riding, but for that you simply need a bigger bike. That's where a Goldwing, Venture, Voyager, or Suzuki Cavalcade comes in real handy. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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