Johnson "70mod"

[hupiveneilija]

Put the big pitch on her and spin her up!

First have to find one! Its not easy.
Asked about 2 blades on other topic.

Hey, its fishing motor. Not suppose to go almost 58kn😂😂.

Btw can one hear too early ign timing or is it just little driving and take plugs out to see them.
Sligthly tempted to try more timing.

[LittleCharger]

First have to find one! Its not easy.
Asked about 2 blades on other topic.

Hey, its fishing motor. Not suppose to go almost 58kn😂😂.

Btw can one hear too early ign timing or is it just little driving and take plugs out to see them.
Sligthly tempted to try more timing.

You can hear if you know what you are listening for but most of the time people find out to late lol...some guys run 21 but they typically drag race.

Two blade are not as efficient I'd look for a three blade.

Good speed should be able to get another couple mph out with some bigger pitch

[hupiveneilija]

You can hear if you know what you are listening for but most of the time people find out to late lol...some guys run 21 but they typically drag race.

Two blade are not as efficient I'd look for a three blade.

Good speed should be able to get another couple mph out with some bigger pitch

Have to concentrate on 3blade, might be also better when things get rough and choppy.

Think that smallchamber head have better control on combustion and firing, so it might be able to use more timing. Have to keep things on a rich side.

Hah, had cold ring under *** yesterday; tought that something is happening cause engine started to slowing down repeatedly. My bad had forgotten airscrew on the tank closed, so tank was all sucked in. Open screw and off you go!😂

[filthy phill]

there is lots of props for sale but all too far away in the usa and the price for postage is just so expensive, plus taxes.

can always get a srx for a v6 and get rehubbed for 13 spline. and take down to 14 inch diameter.

if you have a press you could do this yourself, just make a ring to help guide it in with dish washing soap for lubricant.

but again its hard to find the right sizes here in Europe.

[hupiveneilija]

You can hear if you know what you are listening for but most of the time people find out to late lol..

This is SO TRUE!

Now i know what to listen!

[filthy phill]

what carbs and jets were on the original motor you were running before you made nose cone ?

[hupiveneilija]

what carbs and jets were on the original motor you were running before you made nose cone ?

These 1992 70hp wich are in place now. 50D.

[hupiveneilija]

From left#1#2#3. This is after 10nmile, fullthrottle almost hole trip and wot last 1nmile.
59jets and timing 22*. Temp from head surface after shutdown little under 40*c, thats too low have to get higher or what? But where to restrict the flow? And 2.5bar pressure wot or its where meter stops.
Otherwise goes really nice, boat is 👌to drive even it was real choppy today.

Went 54kn 7400rpm, awfull wind facing front.

A friend of mine was riding along today with his Argo cat 21& 200xs Ros.

Need more this! 😂😂

[filthy phill]

54 knots ? that is pretty dam fast . it = 62mph .
to get that with a head winds is extremely good, and 7400 rpm she must sounds very good too.
photo shows the boat running pretty level,

the 1992 carb , is that 1.5 inch throat or 1.25 inch throat ?

on plugs no 3 looks to be best to me no 2 a bit lean maybe
and what colour 2 stroke oil are you using ? .. clear...red...blue...green ?

temp will be low if no thermostat fitted, too much water flow cooling it down, I would sooner have thermostat that restrict the flow any other way.
because to get correct temp at high rpm the water pressure would be far too low at slow running and idle.
with a thermostat it will be right all the time.

glad it is running good for you ....