Need some suggestions...

[Captain PegLeg]

I went down and removed my pump to tap out the water cooling fitting to a bigger size. While i was down there i was looking at the cooling thru hull and the siphon thru hull lines. The siphon is much bigger than the cooling one. (I'm guessing a 1/2 and a 3/8?) I was wondering if i could swap the two... Just put my cooling line on the bigger one and the siphon on the smaller one?

And also, with a bigger water cooling tap on the pump, and using the bigger thru hull fitting, can i just upsize all my cooling fitting and lines to run more water through my motor? What would happen IF i did this? Thanks guys!!! :brap:

Oh yeah... on the 1996 Kawi 750.

 

[Captain PegLeg]

After much reading... i'm thinking of doing the thru hull fitting swap, and putting a bigger fitting on the bottom of the manifold only to fill the cylinders with more water, but still only putting the same amount into the pipe? Or should i just make every fitting/hose bigger?

 

[SurferSmurf]

i have 1/2 lines going into my motor but have 3/8 coming out of the top of the motor. you may not have enough room on your manifold to tap to a bigger size water line. the fitting may be too large. my manifold was tapped 1/4npt from the manufacturer so it was easy but if yours is tapped 1/8npt you may have issues with fittings interfering with your pipe. just make sure you measure twice and cut once.

 

[stanton]

i wouldnt bother i mean are you having overheating problems?

 

[Captain PegLeg]

i wouldnt bother i mean are you having overheating problems?

Yes... its bad. Only time it runs cool enough is when you go pretty much wide open everywhere and run the carbs extremely rich. If you just cruise slowly just goofing, she overheats bad. There is enough room to tap out to 1/4 everywhere... the manifold has a good amount of extra around the 3/8 fitting, so i think the 1/4 fitting should fit fine.

Anyone have suggestions about swapping lines from the thru hull fittings?

Also, if i run 1/4 everywhere, won't this give me alot more water in my pipe causing even more crappy bottom end? Maybe a pisser from the head before the exhaust?

 

[SurferSmurf]

i think you might be mistaking that a 1/4npt fits 1/2 hose and and the 1/8npt fits your 3/8 hose. you would need to be able to fit the bigger fitting. go to a store and look at the size difference before you do anything. i would hate for you to screw up your manifold. or better yet buy a bilge pump and then use both water lines and have dual cooling.

 

[Captain PegLeg]

Yeah... my bad. I was confused. So all my stock fittings are 1/8? That makes alot more sense. Thanks alot! I am gonna try the bigger thru hull and also the 1/4 fittings... I'll let everyone know how it all works out after sunday. Also, if anyone thinks that this is a bad idea, PLEASE chime in!

 

[josh]

well i got alot of parts 4 that aki

 

[Captain PegLeg]

What kind? Always looking out for good priced BRAAAPP!

 

[keefer]

Dual cooling or 1/2 inch lines are great but most do not need them unless you are running a 1000cc mill or some high compression stroker for a race engine that runs high rpms all the time. If you are overheating I would be more worried about the root cause of the overheating. Detonation or poor cooling flow due to to a bad head gasket or a restricted cooling system. I have a 84.25mm setup with 215 compression with advanced timing on an enhancer fueled with 110 octane. I run a single 3/8 cooling line with no overheat problems. I do mostly freestyle and no extended WOT runs.

 

[Captain PegLeg]

Dual cooling or 1/2 inch lines are great but most do not need them unless you are running a 1000cc mill or some high compression stroker for a race engine that runs high rpms all the time. If you are overheating I would be more worried about the root cause of the overheating. Detonation or poor cooling flow due to to a bad head gasket or a restricted cooling system. I have a 84.25mm setup with 215 compression with advanced timing on an enhancer fueled with 110 octane. I run a single 3/8 cooling line with no overheat problems. I do mostly freestyle and no extended WOT runs.

I got a brand new head gasket. the boat won't overheat if you stay almost wide open, only when you are just cruising and "blurping" around.

 

[Scraggly]

I got a brand new head gasket. the boat won't overheat if you stay almost wide open, only when you are just cruising and "blurping" around.

you almost have to have a clogged line or a stopped up water jacket/manifold or something. i have ran 210 psi off of one 3/8 line in hot water and been ok.
i run duals now just as a safe guard, but i dont feel its really needed. i would double check everything between the pump and the exit, you will probably find something that hinders flow.

good luck man

 

[Captain PegLeg]

YESSSSSSSSSSS!!!! Fixed my overheat prob! Boat ran all day! BUT..... I found out i have a bad lanyard switch. And also, the ski will die when holding a steady throttle under 1/2??? You have to give it burts of gas to go slow. I tried moving the air/fuel screws everywhere... and suggestions on this problem?

 

[djkorn1]

water in gas... take carbs apart and clean them. empty gas tank

 

[Captain PegLeg]

Reeeeaaaalllllyyyy.... hum. Is it possible to just drain the fuel tank and blow air through the carbs?

 

[Captain PegLeg]

Ok... gonna drain the tank, run some gas through the carbs, and refill the tank with fresh gas. Since i work ALL the time now, i only get one shot at the lake a week. WHAT IF the gas doesn't do the trick? Anything i can look for lakeside?

 

[X2Pilot]

carb rebuild? hows the filter in the tank?

also on the cooling, keep in mind that the holes in the gaskets are what mostly determine cooling flow, there are 3 holes in the maifold gasket for each cylinder, about 3/32" the ones in the head vary depending on where they are at some are 3/32" and some are 1/4"...in the old westcoast dual cooling instructions it told you to open up the head gasket 1/4" cooling hole that is on the front carb side to 3/8"....small differences in the gasket holes makes significant differences in cooling properties.

 

[Captain PegLeg]

I got the cooling situation under control now. Just trying to figure out why the turd is dieing while cruising around at under half throttle.


Djkorn1... It takes a while for it to "blow out" and get on the pipe after running full throttle for a little bit, does this back up your theory?