Topic: Lost an idle mixture screw on my '80 CBX - AGAIN - Help

[kpier883]

I am looking for ideas to solve a problem I have had twice this summen on my '80 CBX.  The carb on cylinder 4 lost the idle adjustment screw this past weekend on the ride to Barber's vintage days . 

Earlier this summer the same thing happened on the same carb.   

The last time it happened I took the carbs off because there is no room to reach with them on the bike and couldn't be sure whether the o ring and washer fell out with the screw.  I replaced the screw with a new assembly complete with new spring, new screw, and new washer and o ring.  Then set all screws to 2.5 turns out.

Then, I sprayed some black paint into a container and used a small brush to dab paint onto the threads of each screw thinking it would "wick" into the housing and sort of lightly glue the screws in place, keeping any of them from backing out.

It didn't work.  The same screw (#4) fell out in less than a day of riding.  All the others have stayed put, but this is the second time I've lost #4.

I am reluctant to use loctite for fear that I will lock the screw in place permanently.  They are brass and the head can be broken off when trying to remove one if it is too tight. 

You have to tilt the motor forward in order to get the carbs off this bike so it is a pain.  I would welcome suggestions on how to keep the screw in place.  HELP!

Thanks. 
Kirk

PS going to bed for now and hoping for ideas on Monday

 

[dave500]

is the spring under the screw holding it tight enough?i would have thought the paint would work,heres some pictures from a recent show here for you to drool over.

[Rigid]

We used  silicone fuel line on model airplane engines when the needle valve would back off.  Your equivalent would be a dab of rtv silicone.  It is vibration dampening and nonhardening.  That looks like about 6X more trouble than a single cylinder.........

[kpier883]

is the spring under the screw holding it tight enough?i would have thought the paint would work,heres some pictures from a recent show here for you to drool over.

Ahh yes, The Beast.  I have seen some video of this one racing.  Sounds great too! 

Well, maybe I should stretch the next spring a bit.  The one that was in it was new.  I figured the reason that the screw backed out the first time was due to a weak spring, but thought the new spring would have solved that problem until it fell out again.

 

[kpier883]

We used  silicone fuel line on model airplane engines when the needle valve would back off.  Your equivalent would be a dab of rtv silicone.  It is vibration dampening and nonhardening.  That looks like about 6X more trouble than a single cylinder.........

Having never owned a single cylinder bike I can't be sure.  But I know this.  It is probably 2 to 3 times as much trouble as either the KZ1000 or the SOHC 750!  But it is  n i c e  when it is running right!  And I think once I get all the kinks worked out it will be pretty reliable...  (famous last words?)

I may give the RTV silicone a try.  Do you think it will stay put over a long period of time?

Kirk

[tomkimberly]

This stuff works great.

http://www.durablesupply.com/dytaprtoma.html

Tom

[kpier883]

This stuff works great.

http://www.durablesupply.com/dytaprtoma.html

Tom

Thanks Tom.  Does this product hold the screw or bolt in place or is it mainly for noticing movement?