Roo's Viffer

[Laverdaroo]

Evening all,
Stripped her down after a bit more homework and some good advice and was pleasantly surprised for once. It is a Honda after all!

I had fears of the pot being holed as someone previously mentioned and I bobbed a camera in there and saw nothing but was still wondering. Anyhoo, took the head off and although you can see where the electrode gave up and hit the pot, there is no damage!

Turned the engine and saw no scores on the bore and still good honing marks so I think I’ve dodged a bullet there!

Still waiting on a head gasket from Japan, on special order but happy to bob it together when it comes with little else engine work except a monster clean and a tickle up. Might push the boat out and bob some new hoses on her but for the most part, quite salvageable I fink. Whoop whoop, the old girl will go on. (Firework. Emoji)

Spot the impact mark and the thread on the plug hole, completely eroded away. I actually think the thread gave up under pressure and the plug hit the top of the pot, knocking the electrode off before  it blew the debris straight out of the exhaust. Possibility anyway. The cleaning will begin tomorrow night!


Keep you posted


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[Laverdaroo]

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[Laverdaroo]

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[Sesman]

Great news, Roo.👍👍

[Johnny4428]

Great the work is progressing, and restricted to just the top end.(although still a lot of work)😜

[Rozabikes Tim]

Top work you capable man!

I would say the fact gasket special order is a direct result of how reliable those things are. Nobody needs to take them apart because they don't break!

[Bryanj]

The plug should not have been able to go further down and hit the piston as it stops on the plug gasket, unless the very end broke off only the electrode should have hit

[Laverdaroo]

It’s just the end then, it was well after 1am when I wrote that, all in all a slight win.

Preparing for the costing up of the shims required to get this back together, think it’s gonna be a dear but hoping for minimum expenditure on shims if I can help it, but I’ll have to wait for gaskets to appear before I can get that far.

Cleaning stuff tonight………..just for a change


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[Laverdaroo]

Top work you capable man!

I would say the fact gasket special order is a direct result of how reliable those things are. Nobody needs to take them apart because they don't break!

My thoughts exactly Tim.  The few places I did call all said the same thing, they never fail! Reassuring


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[Laverdaroo]

Great the work is progressing, and restricted to just the top end.(although still a lot of work)

Never worked on such a thing that required this much prep to do a relatively straight forward job. Super impressed by the engineering in the motor, it’s a proper thing and amazed at the simplicity in it’s complexity if you know what I mean?


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[Trigger]

Just make sure that you just de coke the valves and do not remove the black Teflon type coating from them. The Honda valves had this special heat resistant coating and you can not even lap them in. You regrind the valve seats to match the valve     

[Laverdaroo]

The new head’s really clean so won’t need to spend hours on it. Thanks for the heads up and I’m already aware of the Teflon coating to watch out for


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[Bryanj]

You can reshim the head on the bench whilst waiting for the gasket, just have one cam in at a time, knowing Hondas it wont need it anyway plus you have the spares from the old head

[Oddjob]

What size are the shims Roo, I have quite a few that fit my CB1300, measure the old ones and the gap and calculate what size is needed and I'll see if I have it in stock, I have about 30-40 of them. I think mine are 7.48mm

[McCabe-Thiele (Ted)]

Considering the miles on your bike those valves look amazing  - must be a great bike.👍