Author Topic: Cylinder head  (Read 6098 times)

Offline Coppertop1234

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Cylinder head
« on: August 31, 2015, 09:53:53 AM »
Project 2  (1978 F1) has issues with the head so we are looking for a replacement top end.


I have seen an F2 head on eBay in UK and think it would be a straight exchange?


Any advice please

Cheers

Keith Snr

« Last Edit: August 31, 2015, 10:13:21 AM by Coppertop1234 »
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Offline hairygit

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Re: Cylinder head
« Reply #1 on: August 31, 2015, 10:06:04 AM »
Project 2 is an F1? An F2 head can be made to fit, but it's a lot of hassle to keep it oiltight due to mods to the lubrication and oilways/return passages in the head, and are notorious for rapid valve/guide failiure, and very expensive to source replacement.  Far better to look for the correct head, also shared with the 750K7. I understand that earlier K heads will also fit, but you'll need to get advice from Bryan or Trigger as to what's involved
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Offline Spitfire

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Re: Cylinder head
« Reply #2 on: August 31, 2015, 02:02:56 PM »
I may be wrong but if I remember correctly the F2 has domed pistons and larger volume hemispheres in the cylinder head so you will be lowering the compression, here's some info from the US site, http://forums.sohc4.net/index.php/topic,99165.msg1105940.html
There is probably more information over there.

Cheers

Dennis
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Offline royhall

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Re: Cylinder head
« Reply #3 on: August 31, 2015, 07:15:34 PM »
Most definitely not the same. The F2 head is unique to the F2, bigger valves being the biggest difference. Don't think it would fit either, dowels are possibly different.
« Last Edit: August 31, 2015, 07:23:52 PM by royhall »
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Offline Trigger

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Re: Cylinder head
« Reply #4 on: September 01, 2015, 08:44:03 AM »
+1 with Roy on the F2 head, will be a nightmare to get it right. Some of the F1's had domed pistons, but even that head is not a straight swap.

Offline Coppertop1234

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Re: Cylinder head
« Reply #5 on: September 01, 2015, 11:44:38 AM »
So the F2 head is out of the running - Thanks for info

Will the K6/7 series be a possible replacement.
Seen some in USA, but expensive when postage and customs have had there bite of the cherry

I am struggling to find a 1976 F1 in decent condition, has anyone got one they would wish to part with?

Cheers

Keith Snr
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Offline AshimotoK0

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Re: Cylinder head
« Reply #6 on: September 01, 2015, 12:12:50 PM »
Not sure K7 is different. I had one but I gave it way yonks ago to someone on here.
Think the K6 would be OK though
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Offline hairygit

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Re: Cylinder head
« Reply #7 on: September 01, 2015, 01:41:55 PM »
K7  will fit, the K7 used the F1 engine, but fitted with those awful carbs similar to the F2
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Offline captaink

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Re: Cylinder head
« Reply #8 on: September 01, 2015, 04:47:47 PM »
Reference  the comment valve guide failure on f2s. As a point of interest, I have just ordered new cast iron APE f2 valve guides in the UK for under £70 the set. In stock.
Found a supplier...Suzuki performance spares. They have a website and are Honda also.
« Last Edit: September 01, 2015, 04:51:02 PM by captaink »
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Offline bytio

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Re: Cylinder head
« Reply #9 on: September 01, 2015, 05:40:50 PM »
I can see the bronze guides there, but not the cast iron ones,  do you have a link?

Offline captaink

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Re: Cylinder head
« Reply #10 on: September 01, 2015, 06:12:08 PM »
i think the guys name is Nick. They may not be listed but he has them,
I confirmed there f2, he seems quite knowledgable .
The bigger f2 valves I have ordered from him are coming from the USA and are kibblewhite and will be about 2-3 weeks although double the cost of other valves.
Springs are also in stock.

I will most likely order the big bore kit from him at £ 495 as it's also in stock
CR750 Replica
Norton Manx's 1947 & 1956
Norton CS1 1930
Norton International  1934
Norton 16H 1924
Norton Model 18 1929
Norton Commando / Colorado Norton Works
Triumph 1947 GP Replica
Triumph Bonniville 1967
BSA Goldstar Daytona 1956
Harley Duo Glide 1961
The Rickman project
And the CR dick Mann replica project
Sold a few of the Bikes so only got these left
Gt40...Car I know
E type fhc 1964... Car I know


" Greedy I Know

Offline royhall

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Re: Cylinder head
« Reply #11 on: September 01, 2015, 06:18:50 PM »
Got my F2 Kibblewhite valves from CycleX in the States. Good price and fast delivery. I'm told the original guides are a good replacement as they were changed later on for harder items that wear less. As they kept the same part number, I believe it's called a delta change part?

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Offline Coppertop1234

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Re: Cylinder head
« Reply #12 on: September 02, 2015, 03:36:55 PM »
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Offline hairygit

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Re: Cylinder head
« Reply #13 on: September 02, 2015, 04:11:54 PM »
Ouch on the postage,vand don't forget george osborne will want his cut (whatever import duty it attracts, plus 20% v.a.t. on the purchase price, postage and import duty!) plus royal snail adding at least £12.00 for acting as tax collectors!
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Offline Coppertop1234

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Re: Cylinder head
« Reply #14 on: September 03, 2015, 06:58:13 AM »
Found 1 in Uk but its from a 73 so early K series unsure if it would be compatible or http://www.ebay.co.uk/itm/321466019903?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Better price but will it fit a 77 F1?
« Last Edit: September 03, 2015, 08:09:41 AM by Coppertop1234 »
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