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starcruiser

Hole in the Head anyone?

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Hey, hi all. Has anyone out there had any experience, or luck, in bogging up holes in an XR head? My XR600 has a 5mm hole in the head on the front right side, between the second and third cooling fins not far from the header clamp bolt. I'm thinking of giving it a complete clean, degrease and dry, and then using a bog such as an exhaust putty or some kinda epoxy, any tips in fixing Ol' Holey, and smokey... and ol' pain in the butt. Thanks, p.

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If it's thick enough maybe drill and tap it and install a allen set screew or heliarc weld.

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You could try a product called JB weld. It is a filled epoxy. The website http://jbweld.net/ says that it is good to 500 degrees F (260C), and can take short excursions to 600F (315C). The head temp should top out at about 500 so it might work. Most epoxy's cant take that much heat. I know that JB weld woks great on cracked side covers, but they are a little cooler than the head. It's worth a try and the price is right. You can always grind it out and weld it later if it doesn't work.

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You could try a product called JB weld. It is a filled epoxy. The website http://jbweld.net/ says that it is good to 500 degrees F (260C), and can take short excursions to 600F (315C).

This would be my suggestion as well. I know a tuner that has used JB weld for several years to shape intake ports for better performance. I have not heard of any problems and he still uses it so I think you will be fine if you decide to go that route.

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Cool, thanks, I'll give it a try. I am always keen to give products a damn good workout. If it works I'll post a thread and let you all know if this stuff (JB Weld) really works on a tricky repair. The repair is in a spot which is oily, hot and strangely shaped; it's conical shaped and therefore prone to spitting out a plug of epoxy, cold weld or putty. If the JB Weld doesn't hold it may require the suggested threading and screw solution, or a heliarc weld. I'll keep you posted. Thanks, p.

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Hey Cleonard; so where exactly did you find the information for the temperature of the head? I used some high temperature black paint to paint the headers (1200F) and it kind of bubbled. I cleaned the area up very well (sanded and washed). Could it just be due to the humidity? It suggested 60% max and I was probably pushing it....that might just answer my question

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can you post a photo?

Hi, about a photo... that'd be tricky as the hole is so well-recessed between the fins - on the front of the head - that to see it properly I need to shine a torch in. It's just an odd shaped, but mostly circular hole. It maybe due to age or a shoddy backyard mechanic, who knows?

The hole itself is small, about 5mm max, but as I said it's annoying and stinky enough to warrant a repair as it spits oil onto the header pipes, and as useful as a 'constant loss' oil system can be - not - it needs sorting. Cheers, I'll keep you posted.

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