Hello Guy's. I have recently purchased a flexi shaft kit for my boat.

So my question is? how should I take care for my shaft to prevent excess heat resulting damage, like rotorkilla had recently. I have a Teflon liner in my shaft, so can I just spray whole shaft and its parts with WD40 or I need some special grease

WD-40 is not a good lubricant, it is a solvent/water remover. The most common cable lube is some kind of marine grease - I'd recommend using an R/C boat-specific product like those by Prather, GrimRacer, etc.

The cable should be fully coated before each day of running, then the cable must be removed after each day, wiped/dried off, and NOT stored back in the boat's stuffing tube! Otherwise it will rust and eventually break.


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What? Don't leave the flex shaft in the tube?

This the first time I have ever heard this being done.

The flex shaft in my K & B outboard has been in the leg for the past 10+ years without removal OR re-greasing & it doesn't have one spec of rust.

I also never remove it from my Genesis & nobody here has said to do what you suggest Zozer.

Am I missing something here or does everybody do this?

I pull mine after every day of running, wipe it down and store it in the hull of the boat until within a day or two the next planned running. Then I grease them up and reinstall them in the tube.

See above.

Don't waste your money on "special" grease, for the same price as a little tub you can buy a 1 pound tub of water resistant grease, I paid 4.99$ for the last tub I bought.
BTW I'm almost positive the Grimracer grease is just automotive CV joint grease, looks, smells and feels the exact same.
90w gear oil is also a good lube, some people use a mix of the two.
I usually pull the shaft at the end of the day and leave it out, just makes me go over the boat before I take it out next time.

As I can see replies are different. Some doesn't take their shafts out at all some every time.. So the Teflon liner is not enough, with a small addition of lubricant?

You too Bill?

Why didn't anyone tell me this before??

Geez.

I've run nitro boats since the late 70's . I always take the shaft out after a day at the lake , wipe the old grease off then spray it with wd40 or a like product , regrease with marine type grease reinstall it , and I haven't used a Teflon liner as all they do is cause added friction . I always regrease after a heat race because most of the grease is washed out after one run . Just my opinion .

I never use liners either, pulled the one out of my Motley Crew before the first run. Started that way in the 80's and never had a problem. I have seen drivelines explode when the teflon liner melts and wads up.
I just have a after run maintenance routine I've been using for years. Everything gets a good once over, I hate losing a days running due to something I should have noticed at home where I have the tools and time for any kind of repair.
Esc, fail safe, bushings, linkages, seals. All that stuff is checked at home when I re install the drive shaft the night before boating.
Then I just have to grab the boats and head out the door knowing they'll run.

Teflon lines are useless, just remove the shaft after each run or every couple of runs, wipe it dry with a clean cloth, then smear grease over the shaft and i then use a syringe to apply grease into the end i will insert the shaft into. I then insert te shaft while spinning it to work the grease i syringed in down the tube.

Most of my boats have a teflon liner but a couple don't. I cant tell the difference really. I've never had a problem with the liners overheating or binding up.
But like most others I remove the shafts, wipe them down & store them in the boat. Then regrease & install on the next race day. If the boat does more than three runs in a day, I will regrease it after the third run.

I've read somewhere, must be OSE or so, that when you buy a flexyshaft and stuffing tube that you must buy a thinner diameter stuffing tube if you intend to run it without a liner. Now I read here that some of you remove the liner, effectively making the stuffing tube a liitle oversized. Are there no negatives when its removed?

There's more space for it to whip, and also for water to come up the stuffing tube. It won't necessarily be a problem, but it could.

i do as many have staighted with grease but i purchased a boat along time ago and it was used for racing and the shaft was greased with a mixture of 50w motor oil and something else, i cant remember what but ive never greased that shaft again,, it is always oily when i pull it out to check it !!!!!! wish i could remember what the mixture was i cant even find 50w motor oil and i work in a shop..