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Forum: Engines & props

05 March 2018, 21:56

Replies: 40

Yamaha 2-stroke 50Hp Tuning

Views: 69,246

Posted By phantom 19

It’s a long time since I last made one. I did...

It’s a long time since I last made one. I did have a nice polished alloy yam 90 one I bought from DB Marine years ago (they specialised in XR2s etc), that was a tubular cone type, you had to ditch...

Forum: Engines & props

04 March 2018, 18:25

Replies: 40

Yamaha 2-stroke 50Hp Tuning

Views: 69,246

Posted By phantom 19

Also I used to make my own performance exhaust...

Also I used to make my own performance exhaust using hydrotecs photos as a reference (the website is unchanged since 2002 or earlier!)
They use stock Yamaha tuners cut down and then their own...

Forum: Engines & props

04 March 2018, 18:19

Replies: 40

Yamaha 2-stroke 50Hp Tuning

Views: 69,246

Posted By phantom 19

You are correct in that hydrotec do modify new...

You are correct in that hydrotec do modify new original castings for their performance head. However as well as milling the head, they lathe out the combustion chambers to allow piston clearance.
...

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