Removing sealing silicone

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Speed Freak
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Removing sealing silicone

#1 Post by Speed Freak » Wed Nov 02, 2016 10:06 am

I think everyone here knows it... Silicone (I guess "Dirko HT") was the best friend of the previous owner.
Glad that the NS400R got a new engine and the only 2 areas where he used this sh*t are clutch cover and exhaust gaskets - not too bad to get it away with the finger and a lot of time.

But I got the original engine in overall good condition, only with one damaged crankshaft main beraing.
BUT EVERYWHERE THIS STUPID SILICONE, even on the outside surfaces of the cylinders.

Has somebody here experience how i can remove this silicone?
would be ok to destroy the engine paint...

Edit: I don`t have experience with this stuff. I`m just using it in very small amounts in the areas where it should be used :smt019
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

2002tiil
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Joined: Mon Jun 01, 2015 5:49 pm
Location: Veendam, the Netherlands

Re: Removing sealing silicone

#2 Post by 2002tiil » Wed Nov 02, 2016 12:12 pm

Try to peel it off, you could allso use nail polish remover or Thinner ( use it wisely though, agressive to paint).

silverstrom
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Re: Removing sealing silicone

#3 Post by silverstrom » Wed Nov 02, 2016 12:36 pm

I use Scotchbrite pads. Grey (fine) will do the job nicely.

MK
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Re: Removing sealing silicone

#4 Post by MK » Thu Nov 03, 2016 3:38 pm

I scratch it off with a fingernail and rough cloth.
Sometimes a bit of ethanol or brake cleaner helps.
In very hard cases steel wool extra fine helps (https://www.idealclean.de/rakso-stahlwo ... oCBZ7w_wcB" onclick="window.open(this.href);return false;)

Next time use the grey Dirko , that's much easier to remove and you only need that HT pest on the head and exhaust flanges.
Bye
Martin

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Speed Freak
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Re: Removing sealing silicone

#5 Post by Speed Freak » Thu Nov 03, 2016 5:50 pm

No experience with some chemical stuff here?

I hate scratching off old seals :smt019

As said, I don`t use silicone on my engines, only in areas where it is needed (crankcases or small areas where cables go thru covers or at the half moon seal edges of 4-stroke head covers).
None of my bikes is leaking.
I`m using ThreeBond 1215, Yamaha Part No. 9089085505 :smt005 or also available from Ducati dealers.
You can`t see on my engines if they were already opened or not.

Tried to scratch the red stuff off in a small area - seems that the surface was full of oil when it was applied, was quite easy to remove.
Engine paint quality of the Honda parts is also much better and smoother than Yamaha.
Hope its like this everywhere.
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

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two-stroke-brit
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Location: Houston tx

Re: Removing sealing silicone

#6 Post by two-stroke-brit » Thu Nov 03, 2016 8:24 pm

fine grey scotch brite pad and acetone will get it off but will also remove the paint if used to excess.
She might not be pretty but always a fun ride !!

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