Johnson "70mod"

[hupiveneilija]

Hi all!
Now i have been able ro try that new tuner. Everything else stayed same except that little amount of water wich have been flowing through the can is gone, so its dry!
Top speed before with my srx has been 58.6kn is now 59kn, driven quite warm weather! But the way it takes it is something DIFFERENT, 58 is just like that!!�� Last knot has to be trimmed.
And washmarks are on a rich side.
Drove last wknd 70km wot without any proplems, totally 140km and just under 50litres gasoline, not bad at all!��

-J-

Ps. Guessing the weight until now. 390kg fully loaded w/o drivers!

[hupiveneilija]

Next on todo list. These are 40mm diam so i must open carbs front a little.

[ferdthe4]

good update it's much appreciated. Any measurements on that exhaust tuner and exhaust housing just trying to have a comparison of the difference between stock and yours. Since my application I'm after more mid range power and sounds like the exhaust mods helped your low to mid acceleration from what you said.

[hupiveneilija]

Aargh, my bad! Didnt measure opening so have to estimate: About 5.5cm x 6.5cm on open end. Length is accurate, 20.5cm from powerhead gasket. Those holes on sides of tuner are 12mm each. Excan is full of 8mm holes on upper end.
And offcourse little grinding downwards from P/h gasket with everything put together!

[Hans69]

Next on todo list. These are 40mm diam so i must open carbs front a little.

3D printed?

[hupiveneilija]

Machined

[Hans69]

Very nice.

[hupiveneilija]

Little tinkerin today!
Enlarged carbs to 40mm and grinded those grooves for mounting screws.

[71yella]

What is size of the throat at rear on those carbs? I have 2 sets of 60hp carbs but they have 44 jets and would like to run them on an old 49ci motor but keep hearing that they are too small?