Heat

[Freelancer]

Well, the FPR relocation is not as complete of a fix as I had thought.
Got the ol' warm feeling today while stuck in 1st gear stop&go traffic.

Temp was beyween 94°-96°F and I had 3/4 full tank. Had 45 minutes of normal town and highway traffic then hit a no exit construction area with near dead stop traffic.
 After 30 minutes of creeping along at idle in 1st & 2nd gear, the tank started feeling warm through the jeans.  :swear:

Up until the bottleneck the temp was fine and once I got back up to highway speed she eventually cooled back down. *Note-The tank never got as hot as it used to....but it got warm enough.

So, as it stands, The FPR relocate as I've done mine is definitely an improvement but not a perfect fix. The tank used to get hot at highway speeds, but haven't had that problem for a year.  The tank also cooled back down after I got going again.

So, I apologize if I mislead anyone with my earlier claim that the FPR relocation was a full fix/cure for the problem.


My next attempt at fixing this will probably involve a lower airbox delete. Then a smaller drycell battery laid on its side and a fan to help pull the hot air "through" the newly created open area. Basic idea is to give the hot air some place to go by venting it into the rear wheel low pressure zone.

Let me know what you guys think


Again, sorry for my error,
Freelancer

[rsexauer]

Finally got around to moving my FPR out of the oven. I modified my setup slightly, took FPR with mounting bracket out. Flipped the bracket over and hammered the tab with the u-shaped cut-out to hold the outlet side from twisting when tightened. I hammered it back and then down 90degrees so it would remount 180 from original position. If that doesn't make sense I can try to post pics later. I then mounted the bracket to the side of the radiator In the two threaded inserts on the side of rad. My lower fairings are removed from my LT model so there are no clearance issues. I then moved the vacumn line from the rear, number 4 throttle body? To the front, number 1 throttle body. I can't see that the bike would care which source it was drawing vacumn from and it appears to run fine since then. I shortened the upper fuel line so it is a straight shot down from the tank into the FPR, then straight out the back of the FPR down the fuel rail with a large radius turn back up into the rear of the fuel rail. Instant and immediate relief from the hot fuel tank of yore. After cleaning up the now exposed FPR and zip tying the fuel line I do believe I have a neat clean looking fix. I will try and post some pics if requested just waiting on a new PC right now, not wanting to try and tackle that task on this damn tablet.

[Elipten]

Pictures please

[rsexauer]

sorry about the delayed response, computer issues. The first and third photos are of the mounting on the side of the radiator with existing captured nuts. new holes were drilled in the mounting bracket to line up with rad. holes. the middle photo is routing of the fuel hose along the fuel rail and vacum lines covered with the spring protector is now ported off the front throttle body.

[Motorhobo]

I mentioned to the local and expensive BMW dealer (in NC, actually) that I was restoring a K75. He mentioned, without me asking, that they are bulletproof in the heat due to the fact that it uses the same cooling system as the K 1000. Even went so far as to say in the fan isn't even needed on the 750 with the cooling system for a 1000.

Not true. Get stuck in stop and go on a hot day on black asphalt with no fan and your temp warning light will be on in minutes.

[The Mighty Gryphon]

Nice photos rsexauer.  Your Fuel Pressure Regulator installation looks better than the OEM install.  Looks to be much more serviceable.  Any issues with the radiator shroud going over it? 

Looks like I will have to do this mod on my bikes.

[rsexauer]

What you see is what you get, no other fairing than what you see. The FPR does not contact the rad shroud at all.

[F14CRAZY]

I mentioned to the local and expensive BMW dealer (in NC, actually) that I was restoring a K75. He mentioned, without me asking, that they are bulletproof in the heat due to the fact that it uses the same cooling system as the K 1000. Even went so far as to say in the fan isn't even needed on the 750 with the cooling system for a 1000.

Not true. Get stuck in stop and go on a hot day on black asphalt with no fan and your temp warning light will be on in minutes.

Though with a working fan the bike has no trouble at all staying cool (at the expense of the rider, of course)

[Tuco]

On my 87 LT I just removed the inner panels where your knees typically are. Figured this would allow the hot air from the radiator to exit and not get built up under the tank. Seems to work so far, since its relatively cool where I live the air warms my legs a bit. When I venture over to the valley where its quite a bit warmer it still isn't a problem but you feel the heat when stopped. Be interesting to be able install something to control the flow of air. 82 yamaha vision with the full fairing had a setup where you could control the flow of air, it was great in the winter months!!

[Mongrel]

I mentioned to the local and expensive BMW dealer (in NC, actually) that I was restoring a K75. He mentioned, without me asking, that they are bulletproof in the heat due to the fact that it uses the same cooling system as the K 1000. Even went so far as to say in the fan isn't even needed on the 750 with the cooling system for a 1000.

Not true. Get stuck in stop and go on a hot day on black asphalt with no fan and your temp warning light will be on in minutes.

Though with a working fan the bike has no trouble at all staying cool (at the expense of the rider, of course)

Also not true, sadly. Stay stuck in traffic long enough, in heat hot enough, and you will see that temp light come on.

[kris]

You think a K-bike is bad try a Kawi Concours...also a cooker. I think it just goes with sitting on top of an internal combustion engine.

[beemuker]

I mentioned to the local and expensive BMW dealer (in NC, actually) that I was restoring a K75. He mentioned, without me asking, that they are bulletproof in the heat due to the fact that it uses the same cooling system as the K 1000. Even went so far as to say in the fan isn't even needed on the 750 with the cooling system for a 1000.

Well the water pump is the same from a K1200LT

but

get sitting in traffic for a while and you're gonna need that fan for sure. It won't ever turn on in normal riding though

well mine came on [I think] for the first time while riding the other day. the temp was over 100 and I was spinning her pretty hard. it didn't stay on for long. do I have a problem?