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  #1  
Old 13th August 2022
John Harper John Harper is offline
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Default Reroute oil lines on my 1991?

I was inspecting my oil lines today, still appear serviceable, but, I did realize that the dirty deed of changing them is coming. So, I had an idea.

The stock routing (from the pump) is rather roundabout between frame and under the engine, across to the left side, and back up behind the primary case and frame, and across to the tank.

I was thinking perhaps I could route one (or both) lines behind the sprocket/cam cover, across in front of starter end, and to the tank, like the newer models seem to do. I have the 1/2" under battery tank drain hose, so that can stay the same as can the vent line. This would keep both feed and return on the right side, no crossing/under, over, up, and across. The feed line looks rather straightforward, if I can route down through the cover, a straight drop to the pump. Half a loaf would be better than none, if only the feed line will fit, I can still route the return by the original pathway. That would save almost 2' of hose on the feed side.

Has anyone with a '91-'93 bike tried this potential reroute? Looking from underneath, it looks like at least one hose should make it.

Since the pump fittings are still in the same place in 2022, it may be an easy reroute. Who knows?

Maybe I should have posted in the rigid frame section. Feel free to move it.

John
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Old 14th August 2022
Tomcatt Tomcatt is offline
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No reason you couldn't do a re-route. The original packaging was most likely done for assembly line convenience.

I looked at my '17 and the lines aren't run under the sprocket cover but are under the rear of the cam chest cover, immediately behind the cam chest, in front of the front sprocket cover mounting boss. They run under the cover area many trim off. They run over the top of the sprocket cover en route to the oil tank.
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Old 14th August 2022
John Harper John Harper is offline
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Quote:
Originally Posted by Tomcatt View Post
No reason you couldn't do a re-route. The original packaging was most likely done for assembly line convenience.

I looked at my '17 and the lines aren't run under the sprocket cover but are under the rear of the cam chest cover, immediately behind the cam chest, in front of the front sprocket cover mounting boss. They run under the cover area many trim off. They run over the top of the sprocket cover en route to the oil tank.
That's the routing I was looking at as well, more positioned under the camchest cover and up. I'll do some more recon with better lighting.

John
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Old 14th August 2022
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Hippysmack Hippysmack is offline
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You gonna keep all the lines out from under the starter?
Pics?????
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Old 14th August 2022
John Harper John Harper is offline
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Quote:
Originally Posted by Hippysmack View Post
You gonna keep all the lines out from under the starter?
Pics?????
The only line under my starter is the vent line. My feed and return run below the motor and just above the frame from the pump across to the left side and come up behind clutch hump on the back of the case. Then they go to the tank on the right side.


In the above from the FSM, it looks like the red and blue go under the starter but they are actually below the motor. Very poor drawing. Only the vent from the camchest runs under the starter.


This is the back end of the frame and engine, with both oil lines coming from the pump over to the left side.
Photo taken from underneath, upper area of photo is the pump side.


The "shiny" hose is the feed line coming up from the left side and below to the oil tank. You can see the smaller vent line coming from under the starter and the transmission breather hose where it connects to case. As you can see, it's quite a roundabout routing.

John
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Yeah, I see your point. That tranny vent pulled up under the seat and looped down or just down from where it is in the pic?
Here's mine coming off the pump if it helps any.

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Old 14th August 2022
John Harper John Harper is offline
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Yes, thank you for that picture! Rerouting the feed line looks like a slam dunk, but my return line may have to take the original route as can the vent line. My return and vent ports are on the back side of the tank, but my feed spigot looks about in the same place as yours.

Yes, my trans vent line does go up under the seat and loops back. Another long run of hose on my bike. Somebody had stock in Gates Rubber that designed my bike with such long oil lines and vent lines.

John
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