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Author Topic: Cylinder head issue  (Read 410 times)

Offline Bone91

  • Posts: 26
Re: Cylinder head issue
« Reply #10 on: Jul 06, 2018, 20:30:17 »
If you want to see a bodged tensioner arm, wait until i get mine out 😀

Steve
Haha i was reading through your thread yesterday, im also eager to see what the PO has done to that tensioner arm!

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Offline Bone91

  • Posts: 26
Re: Cylinder head issue
« Reply #11 on: Jul 06, 2018, 20:39:35 »
The weld repair on the cylinder head seams fine, I would be concerned about the tensioner mount. I mean luckily heads for the cb360/cb250 are plentiful in ebay.
As for the tensioner that's just what they look like... old Japanese motorcycle welding wasn't what it is today
Ok so new head it is... when buying the head would you recommend finding one as a whole, so rocker cover included?

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Offline MiniatureNinja

  • Posts: 379
Re: Cylinder head issue
« Reply #12 on: Jul 06, 2018, 20:43:30 »
Ok so new head it is... when buying the head would you recommend finding one as a whole, so rocker cover included?

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I'd your rocker cover is otherwise undamaged I wouldn't say to get a new one... these engines were prone to cam journal failure and resulted in bad 'bearing' surfaces on the head and rocker covers making the rocker covers far more expensive than they really should be. If you really want a new one, you can look for one from a cb360 too as they are the same where as the heads differ in the combustion chamber between the 360 and 250
'82 BMW R65LS
'75 Honda CB360 - thread

Offline doc_rot

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  • Oh the usual... I bowl, I drive around...
Re: Cylinder head issue
« Reply #13 on: Jul 06, 2018, 21:22:10 »
Sorry but what is a squish band? Something maybe i could do?

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SQUISH
« Last Edit: Jul 06, 2018, 21:25:31 by doc_rot »

Offline MiniatureNinja

  • Posts: 379
Re: Cylinder head issue
« Reply #14 on: Jul 06, 2018, 23:52:53 »
right - and the CB250 didn't have one - the cylinder heads were FLAT



vs a CB360 head:
'82 BMW R65LS
'75 Honda CB360 - thread

Offline Bone91

  • Posts: 26
Re: Cylinder head issue
« Reply #15 on: Jul 07, 2018, 03:24:35 »
Ok so a little off topic but say i was to go a big bore kit like Sderbyshire, would one have to have the CC machined for the a larger piston to seat up in the head properly? Reason i ask is if you do, instead of me putting money toward a new head i could put it into that as the head might have to be machined anyways? All id have to do is fork out a little extra cash to have to guide seat repaired

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Offline Sderbyshire

  • Posts: 172
  • Into Sailing, classic Triumph cars and motorbikes.
Re: Cylinder head issue
« Reply #16 on: Jul 07, 2018, 05:00:59 »
Would it not be easiest to go for cb360 barrels, pistons and head, or cb389 :-)

I have a set of good cb360 pistons you can have for the price of shipping to get you started!

Steve

Offline Bone91

  • Posts: 26
Re: Cylinder head issue
« Reply #17 on: Jul 07, 2018, 06:15:34 »
Already have a 360 top end hence the thought of the big bore

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Offline Sderbyshire

  • Posts: 172
  • Into Sailing, classic Triumph cars and motorbikes.
Re: Cylinder head issue
« Reply #18 on: Jul 07, 2018, 06:28:38 »
Ok, i can recommend a seller on ebay for gs850 pistons if you do.

He is cruzinimage_uk and was very helpful and the pistons arrived in less than a week from Japan to uk!

Steve

Offline Bone91

  • Posts: 26
Re: Cylinder head issue
« Reply #19 on: Jul 07, 2018, 06:34:16 »
Legend thanks for that Steve

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