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Message |
Forum: TECH TALK Topic: What’s Happening With The 70CES Yamaha? |
| Roflhat |
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Posted: January 22nd, 2024, 7:52 am
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Replies: 15
Views: 2176
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| Yep smallest cc top chamber then increasing towards the bottom. Have to say I'm not 100% on the port specs as Rolf did the porting work over in Norway. I was running to UIM spec, not any more as I have the 90hp carbs on and a few other trick bits like reed block stuffers. But over here they really d... |
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Forum: TECH TALK Topic: What’s Happening With The 70CES Yamaha? |
| Roflhat |
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Posted: January 22nd, 2024, 7:47 am
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Replies: 15
Views: 2176
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| Rolfs knowledge never ceased to amaze me, he hand't worked on a 70ces since the 90's but knew all the port specs, timings, flywheel weight even the resistance of the ignition coils under the flywheel to the nearest ohm. Was always grateful for how much time he gave me, think he could tell I was as p... |
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Forum: TECH TALK Topic: What’s Happening With The 70CES Yamaha? |
| Roflhat |
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Posted: January 18th, 2024, 3:34 pm
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Replies: 15
Views: 2176
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| Genuine Yamaha head gaskets are the only ones worth running. TSR use o rings which is a good concept but they're hopeless in practise, less than 10 hours on mine and water was getting into the head. TSR head is no good in my opinion. Have run the one piece, two piece, TSR head eventually got fed up ... |
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Forum: PAST EVENTS Topic: Marino Swing Cup...Boat Racing ...Finland |
| Roflhat |
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Posted: December 2nd, 2023, 5:52 am
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Replies: 3
Views: 5668
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| Some of the motors are pretty wild, the rules state the motor has to have the standard cowling but any mods under it are allowed |
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Forum: TECH TALK Topic: Yamaha 70 @78mph on a Thundercat |
| Roflhat |
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Posted: May 10th, 2022, 2:04 am
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Replies: 5
Views: 3772
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| A more efficient hull would be the next step, the current one has too much angle on the floor. Too much bow lift which makes it unstable and generates too much drag. Hopefully get another carbon cowl made, and I've got a big pile of carbon to make a new stiffer floor although I might get a new hull ... |
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Forum: TECH TALK Topic: Yamaha 70 @78mph on a Thundercat |
| Roflhat |
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Posted: May 3rd, 2022, 11:51 am
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Replies: 5
Views: 3772
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mattmak wrote: Some amazing effort in this endeavour: 78.1mph retorted, CNC cyl head in the works, etc.. https://www.rib.net/forum/f50/my-thunde ... 12-22.html
Thanks!
Not sure if I'll keep pushing for records or not. Still got plenty ideas on how to go faster it's just a lot of effort and time |
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Forum: PROPS FOR SALE Topic: 11.5x22p 13 spline cleaver |
| Roflhat |
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Posted: January 11th, 2022, 3:52 pm
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Replies: 1
Views: 12060
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Forum: PROPS FOR SALE Topic: 11.5x22p 13 spline cleaver |
| Roflhat |
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Posted: January 6th, 2022, 11:37 am
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Replies: 1
Views: 12060
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Winrace 11.5x22p cleaver. Slightly rounded tips, quick prop. 13 spline to suit 40-70hp. £385 + shipping
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Forum: GENERAL FORUM Topic: SO FEW POSTS SO I THOUGHT I SHOULD POST SOMETHING! |
| Roflhat |
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Posted: September 20th, 2021, 3:17 pm
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Replies: 5
Views: 6004
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| Waves dont get too big for thundercats |
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Forum: PROPS WANTED Topic: WTB T850 Propeller |
| Roflhat |
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Posted: March 23rd, 2021, 4:24 am
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Replies: 9
Views: 8572
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Not sure what your rules are but I've got some props to suit, have a look on
forgemarine.com |
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