Tech Forums > SOHC/4 Bikes
Drilling frame drain holes - cb750
Don R:
Wow that's as bad as mine was.
HondaMan:
--- Quote from: Prospect on April 25, 2012, 05:56:42 PM ---Apparently some of the k1 frames didn't come with drain holes so I'm thinking of drilling my own. The two holes are supposed to be ahead of the engine mounts near the dowtubes. Any of you guys do this and can give me some pointers? It's fairly straight forward but I don't want to drill in the wrong spot and have a lesser effect. Also what's a good product to spray in there to inhibit rust?
--- End quote ---
The holes should be 7/32" to 1/8" size, just behind the forward motor mounts. Use CRC spray, or regular motor oil. Avoid WD40, it is made to ATTRACT water, and does it well!
mycb750k6:
I drilled an early CB750 K1 frame that was missing drain holes and when I did, water came out - quite a bit of it.
zzpete:
--- Quote from: mycb750k6 on April 26, 2012, 06:14:25 AM ---I drilled an early CB750 K1 frame that was missing drain holes and when I did, water came out - quite a bit of it.
--- End quote ---
Wow!! I guess I should do mine!!!
lucky:
--- Quote from: mycb750k6 on April 26, 2012, 06:14:25 AM ---I drilled an early CB750 K1 frame that was missing drain holes and when I did, water came out - quite a bit of it.
--- End quote ---
And if water got in - then air can get in=corrosion.
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