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Discussion Starter #1
Noticed some coolant dripping off the bike today. Upon inspection there is a small leak at the bottom of the front jug. Haven't taken the oil out yet to see if it's leaking coolant inside as well.
Anyway I guess I'll be buying a service manual. Plenty of automotive repair experience so this shouldn't bee too much different. I've never torn down a motorcycle engine before though, so I'm wondering if there's any other PM I should be doing as long as I have the motor out. Bike has 36k on it.
Thanks
 

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Noticed some coolant dripping off the bike today. Upon inspection there is a small leak at the bottom of the front jug. Haven't taken the oil out yet to see if it's leaking coolant inside as well.
Anyway I guess I'll be buying a service manual. Plenty of automotive repair experience so this shouldn't bee too much different. I've never torn down a motorcycle engine before though, so I'm wondering if there's any other PM I should be doing as long as I have the motor out. Bike has 36k on it.
Thanks
Replace the dampers in the left-hand balancer; and probably not a bad idea to consider changing your mechanical seal (right side).
 

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Discussion Starter #3
A buddy of mine who has had 3 of these bikes said to replace the timing chain. ANy reason to do this?
 

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Noticed some coolant dripping off the bike today. Upon inspection there is a small leak at the bottom of the front jug. Haven't taken the oil out yet to see if it's leaking coolant inside as well.
Anyway I guess I'll be buying a service manual. Plenty of automotive repair experience so this shouldn't bee too much different. I've never torn down a motorcycle engine before though, so I'm wondering if there's any other PM I should be doing as long as I have the motor out. Bike has 36k on it.
Thanks
I guess it depends on on how much more stuff you want to tear apart beyond the cylinder base gasket on the crankcase. I don`t recall the age/model year of your bike, and you haven`t put that info in your signature line yet.

There is a small disc shaped oil filter in each of the heads that is the last protection for the lubrication of the camshafts. I myself, would change the little button battery sized filters while the heads are off.

If your bike is more than 10-15 years old, or sat for any long period of time without being started and driven, the crankshaft balancer dampers may be brittle and deteriorating. If you have not seen any rubber chunks in the oil drain screen, the dampers have not yet begun to disintigrate. Your call on whether you want to replace them.

There is also a shifter tie rod on early models (from 1985 to `90 I think) that should be replaced with a heavier duty one if you ever have to split the cases, but I wouldn`t do it now unless there is another reason to go in there.

Do an AC voltage test, and resisitance tests on the stator before pulling the engine. If it is weak, or grounded to the frame, change it while the engine is out.

This is going a bit beyond regular Preventative Maintenance, but if the stator is still ok, you might want to do Tuxedo Seven`s stator case mod while the engine is out and easier to work with it on the bench, in preparation for the day when the stator does need to be replaced.

Just thinking of Pick`s experience least week when his stator died on the road a thousand miles from home and it took mucho donnero ($) and several days at the dealer to get him back on the road. If his stator case had been previously modified, once the stator was in hand either he or the dealer could have installed it in an hour or two.:smiley_th
 

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Linkmeister Supreme
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Replace the dampers in the left-hand balancer; and probably not a bad idea to consider changing your mechanical seal (right side).
Is that the water pump seal you are referring to Cindy?

A buddy of mine who has had 3 of these bikes said to replace the timing chain. ANy reason to do this?
Measure the spacing on 21 chain link pins and compare it to the specs to see if it at or beyond service limits.
Specs are 127 - 127.4 mm between 21 pins. Service limit is 128.9mm
 

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Discussion Starter #6 (Edited)
Thanks for the tips. The bike is a 99. I just bought it in the beginning of June so I don't really know the service history other than the previous owners word. I have done the fork seals lubed the spline and adjusted the rear brakes since I got it. I was really hoping I would get through a season with it and not have to dump a bunch of money into it but it appears thats not going to be the case.
I suppose as long as I have it apart I should do the case mod since if I don't the stator will die as soon as I get it back together. Murphy's law.


(edit) Wow stator case mod $450??? No way. I'll check the voltages before I take the motor out but I'm not dumping that kind of money into this old bike. If the stator dies it's going straight to the scrap yard and I'll cut my losses. I only paid $1500 for this pile. I'll be dammed if I'm going to drop another grand on it. I'm trying to save for a new bike.

Thanks for the suggestion though. If I had any intention of keeping the bike or if I was even that fond of it I would do it. When you mentioned it I thought it was just something minor I could do in my shop lol.
 

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(edit) Wow stator case mod $450??? No way.
Not suggesting the $450 TOC mod.
Instead,.... Tuxedo Seven`s $20 case mod: http://www.vn750.com/forum/showthread.php?t=16839
This is going a bit beyond regular Preventative Maintenance, but if the stator is still ok, you might want to do Tuxedo Seven`s stator case mod while the engine is out and easier to work with it on the bench, in preparation for the day when the stator does need to be replaced.
 

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Question-- Are you leaking 2 or 3 drops of antifreeze ( not much more ) during a 40 - 50 mile run ? If thats all you're leaking I have an easy fix. Send me a PM if you're interested.
 

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Discussion Starter #9

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I guess it depends on on how much more stuff you want to tear apart beyond the cylinder base gasket on the crankcase...
...There is also a shifter tie rod on early models (from 1985 to `90 I think) that should be replaced with a heavier duty one...

Just split my case tonight, I believe this is the shifter tie rod, mine appears to be slightly bent, maybe it needs replacement as long as I'm this far... 3 of my 6 balancers are decaying, one has been torn apart, time to order :)
 

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Just split my case tonight, I believe this is the shifter tie rod, mine appears to be slightly bent, maybe it needs replacement as long as I'm this far... 3 of my 6 balancers are decaying, one has been torn apart, time to order :)
Since you have an `85 model, it is definitely one of those that should have the tie-rod replaced, especially since it only costs a few dollars.

When you get the new tie-rod and balancer dampers please take a picture comparing the old parts with the new, for the benefit of those of us who haven`t seen them yet. Thanks.:smiley_th
 
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