New Purchase - 1993 Kawasaki Vn 750 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 40 (permalink) Old 05-24-2019, 02:51 AM Thread Starter
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New Purchase - 1993 Kawasaki Vn 750

Hi All,

I live in the UK and recently bought a 1993 Kawasaki VN750 with the mileage showing 10,000 miles (not sure how true this is...).

I bought the bike a non-runner for 450 which seemed like a good deal (overall its in great condition for a bike of its age). I took the bike home and started carrying out some checks. 1st thing was the engine oil was below the 'low' mark on the window and the coolant has brownish colour to it. I'm presuming the bike has overheated? I've topped the oil up but left the coolant as it is for now until I establish if the bike will start. After that I will remove the system and flush through.

Also, for some reason the starter relay and all of the spark plugs were missing, so I purchased a new relay, fitted it, charged the battery and the starter/ engine seems to turn ok (without plugs in it). I presume this would mean the engine isn't seized.

I am picking up some new plugs tonight. Before I install them and try to properly start the bike, is there any other checks I should do as I do not want to cause any further damage (if there is any).

Thanks in advance,

Pete
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post #2 of 40 (permalink) Old 05-24-2019, 05:17 AM
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Hi Pete just top the oil up then if you get it running I would change the oil and filter and new coolent Halford pink anti freeze which does not have silicates in it then take it from there. I am in the uk and just finished my vn rebuild
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post #3 of 40 (permalink) Old 05-24-2019, 05:37 AM Thread Starter
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Ok thanks.

Roughly how much are the parts for a full rebuild?

Thanks,

Pete
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post #4 of 40 (permalink) Old 05-24-2019, 06:47 AM
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If you Google kawasaki original parts which is cradleys in birmingham you can get a parts list for the vn up which gives you all the prices from memory cam chains about 20 each head gaskets 13 but you can't get a full gasket set you have to buy them separately if you have to rebuild make a list has you take it apart
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post #5 of 40 (permalink) Old 05-24-2019, 09:16 PM
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Having no spark plugs worries me. I wonder what all may have gotten into the cylinders through the spark plug holes. You need to clean out the tank and put fresh gas in it. I don't know what is available in the UK, but I use Maxima Coolanol coolant. It is specifically made for motorcycles. Whatever you do, DON'T USE DEXKILL. It will destroy your engine. DEXKILL is a mechanics term for a GM product they call Dexcool. It goes in as a red or orange liquid, and then turns into a brown waxy gooey mess inside the engine, plugging up the entire cooling system. The carburetors may also be plugged up from sitting with gas in them. If you have ethanol gas there, the problem may be much worse. Removing and reinstalling the carbs for cleaning is not a fun job, but at least it is free. No expensive parts involved.

As far as rebuilding a Vulcan 750 engine, it has been done, but I wouldn't do it, and I am an auto mechanic with 37 years experience. There is a series of videos on here somewhere about a guy that actually did it. If it needs many new parts, you could buy a brand new motorcycle for less than the price of the parts. I never did figure out how the Japanese could build a $5000 motorcycle out of $25,000 worth of parts and include the labor free.

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 40 (permalink) Old 05-25-2019, 05:13 AM
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I am not a auto mechanic and I have rebuilt 2 vn750 engines it's not rocket science if you want or need help or advice feel free to pm me your mobile no. were abouts in the uk are you?
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post #7 of 40 (permalink) Old 05-25-2019, 01:38 PM
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I am in the U.S. I work on bikes, but the only motorcycle engines I have ever actually rebuilt have been 2 stroke dirt bike engines. I have built and rebuilt a lot of car engines, including high dollar drag race engines. Mostly small block Chevys. I have also built a few air cooled VW engines. The Vulcan engine is a lot more complex than either one of those. I had to give up my job as a mechanic after 37 years (with the same employer) due to disabilities. I still work on cars and bikes, it just takes longer and is a lot more painful. I no longer work on any electronic or computer parts. Mechanical only. I have no interest in electronics (on vehicles, I am an amateur radio operator, but even there I prefer tube radios) and no longer have tools and diagnostic equipment to do that kind of thing anyway. Four of my five cars and all 6 of my bikes are carbureted. One of my cars is a street legal drag racer, and makes almost 600hp. I built the engine myself except for the machine work. I see working on the Vulcan as being more like working on a clock rather than a car or simpler motorcycle. It has twice as many parts as your average v-twin motorcycle. I blew an engine in my '02 Vulcan 750 (broken cam chain) and never even considered trying to repair it. I recently bought a nice low mileage 1997 model, and will be getting it road ready this summer (here in Phoenix, AZ, where it reaches 118+ degrees F) winter is riding season.

The Vulcan 750 engine, in typical Japanese fashion, was never intended to be rebuilt. Unlike car engines, when worn cranks and cams can be reground, cylinders rebored, valve seats replaced, and undersized bearings and oversized pistons and rings installed, large expensive parts have to be replaced. If a Vulcan crank or con rod bearing fails, you have the replace the whole pressed together assembly. You have no way to even check con rod bearing clearances. Cams run directly in the head, with no bearings. So excessive wear means replacing the cams and heads, rather than just the bearings. It can get real expensive real quick. As far as I know, the last truly rebuildable motorcycle engine was the Harley EVO.

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 #8 of 40 (permalink) Old 05-25-2019, 04:07 PM
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My apologies Jerry my comment was not aimed at you or your ability but to help a vn owner in the uk and your view that you can't rebuild a vn750 engine is wrong has you can still get big ends mains rings ect yes they are more complex than a evo engine is true but they can and have been rebuilt I my self have done 2
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post #9 of 40 (permalink) Old 05-25-2019, 08:34 PM
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It's okay, you gave Jerry his needed excuse to copy paste his massive experience that his inexplicably led to a complete inability to work on many things.

1986 VN750 27k miles
1999 EN500 32k
1983 GL650i in pieces. Someday it will ride again.
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post #10 of 40 (permalink) Old 05-26-2019, 12:32 PM Thread Starter
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Hi All,

I have done a bit more investigation.

Im only getting spark from the front 2 plugs, so I'm presuming I need a new coil for the rear 2 plugs - is a coil easy to change over? Am I right in thinking that the engine should still start with only 2 out of the 4 plugs sparking (albeit the engine will run rubbish). At this point I'm just trying to establish if the engine starts/ runs.

When I press the start button it turns over very slowly for about 2 seconds then nothing happens (it sounds like it is struggling to turn over). Im getting about 12.6/12.7V from my battery with the ignition turned off. When I turn the ignition on and press the start button the V drop to about 9.8/9.9. I hooked up a car battery up to my bike battery via jump leads but this didn't really change anything.

On thing that doesn't make sense to me is that I've stripped the carbs and cleaned with carb cleaner and compressed air, yet the spark plugs don't seem to be 'wet' from petrol? Why wouldn't the plugs be getting fuel even after I've cleaned them? They were really clean and the pilot and main jet wasn't blocked. The float wasn't gummed up either and is at the correct angle.

Anymore help and advice would be much appreciated

Where about in the UK are you Trev?

Thanks,

Pete
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