Newbie

[e3steve]

I'm thinking that perhaps Chris means the valve seat-line appears to be about 2mm wide, as viewed through the plug 'ole? I read that, for successful combustion using unleaded fuel, the seat-line should be 1.5mm wide and cut/ground at an angle of 45º.

[e3steve]

..... I do get confused as ya say "At the end of the production of the CB77, the Bomber came to the Netherlands, and the people wanted a modern big bike, so the CB77 was ignored"followed with "
(it was readily available in the 1965)".
Here in the US we had the 450 in 65 and the CB77 also up to 1968 for the 450.......

Hey Ed, you'd be forgiven for thinking that the first CB450(BB) was a bike in high demand in the UK. Not so, alas. Brits were staunchly patriotic to the likes of the BSA 500 Gold Star (DBD34), 650RR, SR & RGS and Norton's Dom 88, 99 & 750 Commando (and, particularly, the Triumph 650s, Trophy & Bonneville, even though the DOHC 450 would eat the former and give the latter a 'right good run'!).

The Jap invasion was fought long & hard by most Brit bike-buyers and the Black Bomber was seen as the first serious threat to our m/c industry. What a laugh! The biggest threat was the militant nature of the bloody factory workforce -- motor- and dock-industries the same!!

Apologies to Chris; we've digressed somewhat!

305s, and then 450s, just didn't sell as well as 250s.

[LOUD MOUSE]

The intake valve and seat will have changed shape (valve will Tulip, wear concave, seat will conform) even with only 9 thousand miles.
Most of the exhaust valves I find do still have a defined (mostly flat) contact area. ...............lm

Motor turns freely and bike only has 9k on the clock. I've opened up every cover I can that allows me to see into the trani case and cam area. I don't see any moisture/rust damage at all. Only thing that makes me wonder if I should open the head and block is that I can see the surface area of the intake valves and they seem wide to me. They look every bit of 2mm wide at the seating surface but not dished out as they would be from wear.

Any one know if 2mm is within specs for these valves or are they shot?

[LOUD MOUSE]

As my attention is more in line to the CB/CL72/77 I've never delved into the impact of the 450.
We here in the US had the same syndrome with the established import bikes being dominate up to 650cc and US brands with larger engines but also for another reason.
We had LOTS of G.I.'s who had fought the Japanese during WW II and "didn't want any of that "JAP CRAP"!
Not just MC but anything Japanese, cars included!
Even by the late 50's early 60's this was still true with them. (my step father was one of them) B24 bomber squadron on the Pacific Islands.
Not all buyers were of the younger generation (16-25) but most were.
As years progressed the Japanese bikes proved they were easier to maintain, dependable and in oh so many ways a better bike than the Established Imports and also the Larger Engine bikes produced in the US. ..................lm

..... I do get confused as ya say "At the end of the production of the CB77, the Bomber came to the Netherlands, and the people wanted a modern big bike, so the CB77 was ignored"followed with "
(it was readily available in the 1965)".
Here in the US we had the 450 in 65 and the CB77 also up to 1968 for the 450.......

Hey Ed, you'd be forgiven for thinking that the first CB450(BB) was a bike in high demand in the UK. Not so, alas. Brits were staunchly patriotic to the likes of the BSA 500 Gold Star (DBD34), 650RR, SR & RGS and Norton's Dom 88, 99 & 750 Commando (and, particularly, the Triumph 650s, Trophy & Bonneville, even though the DOHC 450 would eat the former and give the latter a 'right good run'!).

The Jap invasion was fought long & hard by most Brit bike-buyers and the Black Bomber was seen as the first serious threat to our m/c industry. What a laugh! The biggest threat was the militant nature of the bloody factory workforce -- motor- and dock-industries the same!!

Apologies to Chris; we've digressed somewhat!

305s, and then 450s, just didn't sell as well as 250s.

[chrisnoel]

Thanks Steve and Mouse.


The valve seat line is what I'm refering to as seen through the plug hole like you said. Looks like I'm in for a valve job but I bet I'll have to find some new valves. Last I checked into having valves ground that were worn beyond specs they would have most likely been too thin afterwards and gotten burned. Hope the cylinders turn out to be in better shape as I'd like to get away with just rings and hone. Fat chance. Chiris.

[LOUD MOUSE]

May just happen.
I would have never guessed I'd fly to AUSTRALIA to visit jerry.
I did and I'm much the better for it.
Not so sure about jerry though!. :-) ..........lm

Hi Jerry,

Well, you met LM, and had a good time with him, so maybe he's a good guy. I never met LM, the discussions are the only side from LM I know. I will meet him one day, and yes LM, that's an assumption,

Jensen

[chrisnoel]

Waiting for my work shop manual to arive before I remove the head and block. Want to make sure I park the crank and cam in the right position. So far the only instructions I have tell me to rotate the crank till I find the removable link in the cam chain. Sounds like a recipie to mess up the timing to me.

I did remove the cam cover then I worked on removing the gasket as much in tact as possible incase I need it for a template. Once removed I noticed some words on the paper that said Asbestos. Yikes! I'm sure I didn't give myself cancer but I think I'll wear a resperator and dismantle the rest outside. I'll have to make sure the gaskets get disposed of properly as well.

I wonder how many Honda employee's or employee's of the gasket company suffered from mesothelioma?