McFlyss

Hey guys.

My HSN has a leak, now normally i would have jsut used silocone sealent to re-seal it (any one got a good how to on this???)
But i saw a thread saaying that silocone could harm your engine????

So what do you suggest i do?

Any help would be great, thank you.

46u

My Feedback: (3)

Where at the HSN is it leaking? Most have an o-ring on the part you turn. The proper RTV is fine and I have been using it on my RC engines for over 6 years with out a problem.

McFlyss

Well (as you know) i have just had me piston pinched so have put all needles back to factory. I was priming the engine to try and start it by blowing down the presure pipe and could see fuel leaking from teh actual needle, from around teh side... make sense??

I was going to jsut loosen the needle right out and put a thin layer of sealent thre, what would you suggest?

-SomeGuy-

Heres a good "how to" http://www.savage-central.com/module...whether+engine

McFlyss

[:@][:@]
Bollix, Sorry guys, i just noticed i out HSN, it is the mid range needle that teh fuel is coming out of, really sorry for the muck up!

46u

My Feedback: (3)

If you look in the manual on the K4.6 is shows o-rings on all the needles. I recommend you replace them if that is where it is leaking. But do what ever you think is best.

McFlyss

OK WILL DO, CHEERS MATE

46u

My Feedback: (3)

Good luck and keep us posted. [sm=teeth_smile.gif]

black mamba

The o ring on the needle has gone bad. The same thing will happen on the LSN and HSN over time. I've had this happen to me over the years. Repeated needle adjustments "loosens" the tight fit of the o ring and they eventually leak fuel. The o ring is there to seal the needle and to keep the needle's adjustment. When they go bad, they leak and the adjustment will not hold. Just replace the needle and it'll be ok then.

edit-get o rings that can withstand alcohol fuel. The rubber used in a alcohol application is a little tougher than regular rubber.

McFlyss

ok cool, will havea bash
cheers

SAVAGEJIM

I had o-rings give out on my K4.6's. Here is how I fix 'em.

I get the small clear HPI o-rings (part #6821) after I cut off the old o-ring.
I put on the clear one in place of the old. The clear one is slightly larger than the old, but don't worry, that's needed for the fix.
I then screw in the mid-range needle back in; you will notice this process will shear off the excess material of the clear o-ring; this action causes the o-ring to become the exact diameter of the threads and makes an air-tight seal.
I continue to screw it in until it is flush with the carb facce (this is factory setting for K4.6).

I then fire up the engine and re-tune it and in the process, I also re-tune the mid-range until everthing is where it needs to be.