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July 26th, 2014, 02:25 AM   #21
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Interesting looking piston Bushie.

I now well understand that using big bore pistons is not worth the hassle let alone the expense and far as the part availability.

A big bore and a shorter stroke would be my ideal.
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July 26th, 2014, 02:42 AM   #22
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Great work as usual, i'm struggling to find to time to rebuild mine to standard spec. let alone build a highly modded monsterpeice.
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July 26th, 2014, 02:49 AM   #23
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check squish and piston to valve clearence

Gday Mat

big end is standard, I have a PEEK coated cage but ive already welded this one so it will go in the 700, its only a lame trailbike this one. Im hoping I "never" have to change the mains.

fresh out of spam but have plenty of play dough in stock, top work by my 5yr old assistant.





0.9mm squish, HC3015 cam, intake valves to piston 1.8mm exhausts 3mm CR is about 12.5:1

Last edited by bushmechanic; July 26th, 2014 at 03:43 AM.
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July 26th, 2014, 02:56 AM   #24
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cam chain lengths

houston we have a problem



brand new DID chain is too long, 1 click left to start with

Brand new IWIS less of a problem 5 clicks left to start with.



I poked a feeler guage under the cam bearings, with the IWIS chain the cam can go up 0.5mm, and with the DID 1mm up.

I could hassle spanner for a custom chain guide but raising the cam will help put the rockers down closer to the valve stems.
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July 26th, 2014, 03:01 AM   #25
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Originally Posted by spanner View Post
Interesting looking piston Bushie.

I now well understand that using big bore pistons is not worth the hassle let alone the expense and far as the part availability.

A big bore and a shorter stroke would be my ideal.
nah we just need collaborate a bit and organize things ourselves, my 105mm iron liner probably should have been plated and it was a bit rough but it is still working very well.

108 x 60 with a plain big end would be interesting .. big bore Ducati
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July 26th, 2014, 03:46 AM   #26
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I made a tensioner full radius instead of the flattened off Husaberg design
to get the chain back to the original position so I can use a .8mm head gasket.
Still needs a little development, as the chain wears the tensioner will press the chain into the cam sprocket, but I am close


This is how I do my CAD analysis but it works



Next Is a manually adjusted chain tensioner.

Cheers spanner
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July 26th, 2014, 03:50 AM   #27
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looks fantastic Spanner

i will try your cad modelling program tomorrow after work and see what I come up with

the stock chain tensioner foot doesn't line up to the guide properly not sure if it is possible to correct that with your manual unit.

Last edited by bushmechanic; July 26th, 2014 at 03:55 AM.
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July 26th, 2014, 03:58 AM   #28
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Needs to be more like Dr C model But a bit hard for me to do, could do it on a pentasaurus but we dont have those now



I am thinking your head or deck has been adjusted?
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July 26th, 2014, 04:02 AM   #29
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yes looks to me like the head and the cases have been shaved down

head volume only 34cc (my other bike is 38cc) and the piston is above the top of the cases

I think I have a mitseiki pentasaurus
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July 26th, 2014, 04:04 AM   #30
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Totally agree with the 108x60, 550cc need a lot more valve and carb for that I think! would love the revs
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