Removing head with engine in.

[onethumb]

So just noticed that number one cylinder is blowing air back through the carb. I've slackened of the tappets and although not as bad it's still there. Bad times.
I don't want to take the engine out so what are the thoughts of people on here about doing it with the engine in place.
Is it possible that the seats are original from the days of leaded?
Please help I'm a bit down after how close I was to finishing.
Thanks. Steve.


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[MarkCR750]

Sorry Steve it's just not possible, be sure you have got a problem with the valves though, do a compression check.

[onethumb]

Thanks mark. Is that not possible about the seats or removing the head with the engine in?


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[hondarc166]

i think it's removing the head

[onethumb]

That's not god news.


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[royhall]

Sorry head won't come off unless you remove the engine or cut the frame tubes and weld in a removable section.

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[Bryanj]

Valve seats are fine for unleaded, what engine is it as the F2 wears out valve guides

[onethumb]

Hi Bryan. It's the 1978 f2. Doh. Any recommendations for getting new ones pressed in, and do I now do all of them?


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[Bryanj]

You will need to remove and totally strip the head and check for wear between valve stems and guides, if new are required (exhaust wear more than inlet) you need to find a motorcycle competent machinist as the guides need reaming to size after fitting and the valve seats will need re-cutting. I believe there is an American firm that does replacement parts but be prepared to sit down before getting prices, I would expect just the work to be over £100 and parts £200+ not including gaskets

http://www.dynoman.net/engine/valves/index.html#F2 Valves and guides $250 ish plus shipping

[Trigger]

You will need to remove and totally strip the head and check for wear between valve stems and guides, if new are required (exhaust wear more than inlet) you need to find a motorcycle competent machinist as the guides need reaming to size after fitting and the valve seats will need re-cutting. I believe there is an American firm that does replacement parts but be prepared to sit down before getting prices, I would expect just the work to be over £100 and parts £200+ not including gaskets

http://www.dynoman.net/engine/valves/index.html#F2 Valves and guides $250 ish plus shipping

Valve seats re- ground Bryan  Old Honda seats do not like to be cut 

[royhall]

Would that be because you now have a valve seat grinder Trig?

[Trigger]

Would that be because you now have a valve seat grinder Trig?

Yes I have a Honda one  >>> http://www.sohc.co.uk/index.php/topic,11733.0.html

[onethumb]

Trig, pm sent.


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[Bryanj]

You are quite right but most people associate "ground" with a stick and paste not what we understand mate

[Trigger]

Lap