787 Block Off

[Skyhawk76E]

I have an SBT block off kit I just got for my 97 SPX (787cc). I REALLY don't want to have to remove the flywheel cover to take the oil pump off.

Will the nylon connecting rod fit through the hole in the flywheel cover for removal? If not, can it be left in place?

Do I run 40:1 premix after the oil injection pump is gone?

To mix the fuel & oil can I just mix some fuel with the right amount of XP-S II oil for 9 gallons of gas, pour it in the tank and then finish filling the tank with 87 octane?

Thanks!

[Technical Support]

No it doesn't fit. No you can't leave it to be eaten and chunked by your flywheel.

Yes 40:1.

You have to mix a little at a time externally, no do not add a heavy mix and expect it to magically mix equaly with the rest of your tank.

Taking the cover off is a 10 min job - whats the big deal!

[Skyhawk76E]

It didn't look like there was a lot of room around the flywheel cover to work. I'll take another look.

Does the seal or gasket around the flywheel cover have to be replaced if I remove it?

I'm a little confused about the fuel mixing. Do I need to siphon the tank to mix it, or are you saying I should mix a bunch of 10:1 batches to pour in until the tank is 40:1?

Thanks for your help...late on a Friday night!

[Technical Support]

If your tank is not premixed now, YES you have to pump it out.

Mix it in 5 gallon increments in an external can, add it as you go.

No the o-ring doesn't need to be replaced.

[John Kubiak]

If the oil pump drive shaft is white in color, it is an older, original design and it will slip out through the flywheel cover without having to remove the cover from the engine. If the drive shaft is black, it is the later design, and you have to remoove the flywheel cover to get it out.

[Skyhawk76E]

I'll check on the color of the connector. It's a '97, so I'm not sure it that's early enough or not.

If I do have to take the flywheel cover off, it looks like the front engine mount is built-into the flywheel cover! What's the procedure for that (and is it still a 10 minute job)?

I've siphoned all but about an inch out of the gas tank (with it tilted back on the trailer. Is that sufficient?

Thanks!

[WATERCRAFTSERVICES]

REMOVE THE OIL PUMP FIRST. SEE IF THE COLOR OF THE DRIVESHAFT FOR THE PUMP IS WHITE. IF IT IS IT WILL COME RIGHT THROUGH THE HOLE AND YOUR DONE. IF IT IS BLACK IT IS THE LARGER SHAFT THAT SLIDES OVER THE FLYWHEEL NUT AND IS TOO LARGE TO COME THROUGH THE HOLE. THE FLYWHEEL COVER IS EASILY REMOVED BY REMOVING THE FRONT MOTOR MOUNT BOLT AND PLACING A PIECE OF WOOD OR SOMETHING UNDER THE MOTOR TO SUPPORT IT.THEN REMOVE THE MOTOR MOUNT. REMOVE ALL THE COVER BOLTS AND GENTLY PRY THE FLYWHEEL COVER OFF. THEN YOU CAN REMOVE THE PUMP DRIVESHAFT IF ITS THE BIG ONE. BE SURE YOUR RUBBER SEAL IS NOT PINCHED WHEN YOU GO BACK TOGETHER WITH IT. PRETTY SIMPLE ONCE YOU GET IT GOIN. GOOD LUCK.

[Technical Support]

Very few used the first gen adaptor.

You simply unbolt the mount and remove it. Put it under the block to prop it up a bit, to easily access the cover bolts. THis isn't hard to do at all.

[John Kubiak]

Very few units received the early type, indeed....ALL 1995 XP800, ALL 1996 787's, ALL 1997 787's, ALL 1998 carbureted 787's. The new type drive was first used in the 1998 GTX-RFI, as the original RFI spec crank did not have a square hole in the magneto end to accomodate the oil pump drive shaft. The drive was offered as a service reolacement part to eliminate redundant parts between the carb and RFI engines, and also to permit the use of 1 part number for replacement cranks that would fit both applications. In fact for about 3 years all OEM re-man cranks were shipped with a new, black oil pump drive shaft in the box.

[Technical Support]

We se by FAR more 2nd gen's in as cores, and even give out the adaptors with the engines. Hopefully, this guy will have the 1st, and save a little work though.

[Skyhawk76E]

Turns-out I had the older white connecting rod. I just took a screw and gave it about 2 turns in the end slot and pulled it right out. You guys gave me the info I needed if the cover had to come off, but I'm glad it took only 2 seconds.

On the premix I siphoned all I could out of the tank and figured there was a half gallon I couldn't get to. In the first 5 gallons I mixed in enough extra XPS-II for the half gallon I couldn't get out.

Then I mixed 4 gallons, but I was a little concerned I underestimated the fuel that didn't get siphoned. Knowing it's better to have too much oil than too little I added enough oil for 5 gallons.

Since I mixed 9 gallons for a 9 gallon tank and had about a half gallon left over, I guess I was right the first time on what didn't get siphoned. I figure the ratio in the tank is between 35:1 and 37:1 for this first tank. I assume that's okay since break in ratios are heavier on the oil than that.

Please let me know if I'm wrong on the oil!

Thanks for all the help!
Zack ><>

[Technical Support]

That's fine. Now take off the return line from the carbs and blow though it, to force the pre-mix fuelk through to the carbs.