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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 2 Weeks Ago
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Quote:
Originally Posted by mrmom9r View Post
Still waiting to learn how to put 6 gallons in a 5 gallon bucket.
Get a 5gal bucket from Canada or the UK?
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  #12  
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stikflote stikflote is offline
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Our petrol is bought in litres buckets in litres so still cant 6 gallon in
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GA_Ironhead GA_Ironhead is offline
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You can get those buckets from Blivet, Inc. Add 6 gallons and you'll have 4 gallons of room left!
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Quote:
Originally Posted by stikflote View Post
Our petrol is bought in litres buckets in litres so still cant 6 gallon in
6US gals = 4.99605Imp gals. 5 Imp gal gas can?
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I can get 70 litres of petrol into my 60 litre tank at my local gas station.

That's why I always go there. Everywhere else I can only fit 60 in.

I suspect the concerns about valve seat inserts stems from putting them in alloy heads. With the differences in expansion rates and heat transfer that's a totally different situation.

I suspect that getting someone like MrMom to do the seats would leave you with better performing ports than just cutting in wider seats.

Of course, that's just my opinion and I could be wrong.
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I don't understand why anyone would be worried about having valve seats installed in an Ironhead. When done properly they will not fail. I think the number one benefit with having the valve properly located in the head is rocker arm geometry. I recently had all 4 seats in my 900 heads replaced. The only change I made was to install the larger diameter 1000 intake valve. Obviously it was also a great time to clean up the ports and do a little blending.
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I would like to thank everyone who took the time to participate in this discussion and I appreciate everyone’s personal opinion and advice. I honestly think I’ll go with replacement seats and the correct valve size for my 65 XLCH. My next question is, do I supply the seats or do the cylinder head specialists have standard size blanks they keep in stock? I have seen seats advertised on eBay.
A really good And long established precision engineering shop which was local to me has now moved into a different line of business. They used to make and fit seats into the ATV machines I work with but now won’t touch anything automotive so I’ll have to find somewhere else.
So do you think the eBay seats would be something I should be looking into?

https://www.ebay.co.uk/itm/Harley-Sp...-/150879424656

.......Davi.
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Nitro Frankie Toth did mine about 8 months ago. He provided the seats. Very pleased with the outcome. My 69 has 4 and 5/8's wheels, Sifton Titan cams. I've got about 800 miles on it now and it screams.
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It's generally not a good idea to supply parts for other people to fit.

The machinist may ask you to supply and in that case go ahead. But if you have someone experienced with doing this work they may prefer to source the parts themselves.

This also keeps the job simple in terms of what happens if something DOES go wrong down the track. If you were to have a failure, is it the machinists fault or did you supply bad parts ?

Ask your referred machinist first. Then go with what he wants.

Oh sorry. Just my opinion of course. Not telling anyone what to do.
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Also be sure to provide your machinist with the factory valve height spec diagram so they can grind the seats just enough to reach the minimum height. This will allow future seat/valve dressing without exceeding the factory spec.

Eric
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