Johnson "70mod"

[hupiveneilija]

Took away stuffing i made around reeds, dont push mix to the exhaust on idle anymore. Those plugs i made for comp relief holes, same stuff as nosecone, are gone. Infact i think they were gone by the time i made comp test. Maybe thread and little setscrew. Went out today, ran 45.5kn with 18 raker, dont know revs cause needle stops little over 7k. Have some water issue, dont idle good on water or flushhose. Without better, might be headgasket. Is there a chance that headgasket blows with too much waterpressure? Little lazy for going on plane under 3k especially with raker, dont slip enough, but when nose go down then it goes. Feel like needs to start playing with tuner. But before that i try with srx how it works.

Sorry for tight typing😊

[hupiveneilija]

Those plugs i made for comp relief holes, same stuff as nosecone, are gone. Have some water issue, dont idle good on water or flushhose. Without better, might be headgasket. Is there a chance that headgasket blows with too much waterpressure?

Ordered J-B Weld HighHeat epoxy putty for relief holes and solved the water issue; What a dumbass I am, forgot to retighten the head bolts so they werent tight enough and water went to cylinder(s) and gasket was also broken between thermostat and #1.

I bet it run better after fixing those.

Good night everybody!

[filthy phill]

ha ha we all forget the simple things. the hard things we all remember, bu the re-torque the main head bolts we forget about .
glad you have found your water problem, you will be fine soon

[LittleCharger]

Ordered J-B Weld HighHeat epoxy putty for relief holes and solved the water issue; What a dumbass I am, forgot to retighten the head bolts so they werent tight enough and water went to cylinder(s) and gasket was also broken between thermostat and #1.

I bet it run better after fixing those

Good night everybody!

Keep an eye on the head gasket a tight head like that tends to blow them, head studs help

[hupiveneilija]

Ill do that, thanks!
Have to find studs & nuts somewhere.

BTW Good Morning!

[LittleCharger]

Ill do that, thanks!
Have to find studs & nuts somewhere.

BTW Good Morning!

What size of main jet are you starting with?

[hupiveneilija]

I have original mainjet now, dont remember what it is in those carbs. Made 1 WOT and shutdown, plugs look ok. Pulled head off last night, pistons seems like ok to me.
Have to do those reliefholes with J-B and assemble the head back, then can go out and drive more so that i can see how pistons look by the transferports.

Must get tachmeter wich shows to 8000.

Ouh yes, I replaced those reedbodies, wich Ive stuffed all around, with stock ones. It felt like fighting against itself in high rpms. Better now but weakened lower end, have to find that sweet middle.
And stock tuner in Place, still revs like hell with 18in prop.
There is some tuning to make.

Btw is it any good to use coppergasket spray with headgasket?

[hupiveneilija]

This is how pistons look. #1 is clean because of water.

[LittleCharger]

I have original mainjet now, dont remember what it is in those carbs. Made 1 WOT and shutdown, plugs look ok. Pulled head off last night, pistons seems like ok to me.
Have to do those reliefholes with J-B and assemble the head back, then can go out and drive more so that i can see how pistons look by the transferports.

Must get tachmeter wich shows to 8000.

Ouh yes, I replaced those reedbodies, wich Ive stuffed all around, with stock ones. It felt like fighting against itself in high rpms. Better now but weakened lower end, have to find that sweet middle.
And stock tuner in Place, still revs like hell with 18in prop.
There is some tuning to make.

Btw is it any good to use coppergasket spray with headgasket?

I would fatten your main jet if you have raised your ports and bumped the compression, as soon as you load that motor with the bigger pitch prop she is gonna melt the exhaust side out. Main jetting for sst60 spec motors is generally 72 and 73 your probably like a 65. You want to go fat and work your way down not a lot of clean wash on those pistons it does show some but that could be lower rpm wash.

Fuel is power if you haven't increased your jetting to flow more fuel your either gonna burn it up or you haven't really made any increases in noticeable power (ie. factory jetting is usually a little fat)

[skeg]

Ill do that, thanks!
Have to find studs & nuts somewhere.

BTW Good Morning!

If you find someone that make heads studs please post it