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Author Topic: 1984/5 Yoshimura  (Read 2223 times)

Offline ka-ja

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1984/5 Yoshimura
« on: April 15, 2020, 04:01:29 PM »
Found in one of my carrier bags.

       
« Last Edit: April 15, 2020, 04:34:17 PM by ka-ja »
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nice bike,nothing in the bank

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: 1984/5 Yoshimura
« Reply #1 on: April 15, 2020, 05:36:01 PM »
Yep, I will have all those bits done at those prices please. But I agree with him, at £350 the smooth bore Mikunis can stay on the shelf. 😊😊😊😊. But, some of those parts were really expensive then.
« Last Edit: April 15, 2020, 05:37:40 PM by Nurse Julie »
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LINK TO MY EBAY PAGE. As many of you know already, I give discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Andych

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Re: 1984/5 Yoshimura
« Reply #2 on: April 15, 2020, 11:20:47 PM »
My 466 piston kit didnt cost me much more than that when converted from Aussie Peso's... but it isnt a Yoshimura Kit either..
Is there really much to gain from Gas Flowing the head on a 400? I guess removing any casting dags and port matching would be all you might really do.

Not sure on the "mods" to the valves unless they change the grind angles which might be fine for racing but might not work too well on the road.

That list now gives me something to take along to my "Old school" engine machinist and head man to start on the spare engine... one I finish getting my garage re-sorted.
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1975 CB400 - Project
1978 Yamaha SRX250 - Project

Offline ka-ja

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Re: 1984/5 Yoshimura
« Reply #3 on: April 16, 2020, 12:41:18 PM »
Head was gas-flowed to 26mm dia. on each inlet tract. Exhaust valve seat width reduced to increase flow area.
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nice bike,nothing in the bank

Offline ka-ja

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Re: 1984/5 Yoshimura
« Reply #4 on: April 23, 2020, 07:29:48 PM »
I finally ended up at Towchester Tuning Shop, more treasures from the attic
« Last Edit: April 23, 2020, 07:31:39 PM by ka-ja »
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nice bike,nothing in the bank
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