Do I have to have the MPU reprogramed ?

[diddler1954]

I am rebuilding my 950-DI upper end, a piston was lost due to detonation, the shop is boring out 1mm, making it 89mm.
With that being said, will I have to have the computer reprogramed to allow for the increase of air volume?
This is in a 2001 GTX DI, the craft looks brand new, see pic.
Also, does anyone know of an inexpensive programmer like Candoopro that allows perimeter changes (New or Used)?

 

[etemplet]

You don't need to reprogram anything and I can't think of any parameters that would need programming. I have a Candoo and generally just use it to make keys, reset Throttle position and such. It can do more with the DI but I have always solved problems with good old fashioned trouble shooting. Good Luck.

 

[diddler1954]

Thank you for your reply, I feel much better.
So the Candoopro Limited is all one needs?
Thank you again

 

[etemplet]

I am not sure what you mean by "limited." I upgraded to the "unlimited number of licenses". I don't see any difference in the performance of the Candoo System as a result of the upgrade. The difference is I can use the Unit on as many skis as I want. I believe for someone that is using it for personal the 5 Licenses that come with the purchase would be all you need. I'd caution anyone that believes the Candoo is going to solve ski troubleshooting problems on the 2-strokes, there just isn't that much electronics to benefit. Candoo is much more helpful on the DI.

 

[diddler1954]

Again, good to know. I was under the impression Limited was what the unit will do.

 

[mikidymac]

You need to find out why you lost a piston.
I would at minimum sent the fuel and air injectors out for cleaning and inspection.

 

[diddler1954]

I wasn't the one that lost the piston. the gas in the machine was yellow it was so old. with that being said, detonation !
I will post pictures.

 

[diddler1954]

The 950 Di upper end rebuild is completed, the jugs now are 1mm over. I added extra oil to the new gas to make sure the motor has oil.
The motor runs great, However, I noticed the wear ring was falling apart like rice glass when I was running the motor. Other than that, no codes, only had 175 hours on it when it went down. I am very happy with this rebuild I did.
Now off to rebuild the pump. Prop and bearings are very good.......LOOKS LIKE FUN.... replacing the ring. Any helpful input on this?

 

[Grim]

I always hear people say they put the ring in the freezer for a few hrs before install, makes it slide in easier. Normally people has use a Sawzall to remove the old one, but be careful not to cut the outer housing.

 

[diddler1954]

I put a small blade on the saw, the ring fell right out. Waiting on the prop tool to remove it before installing the ring.
The anti-rattle pusher is dark around the metal tab, I think I will replace the cone and parts to be sure.
Any helpful hints as to trimming the ring when installing the prop???

 

[mikidymac]

You don't trim the ring.
Impeller should go into the new ring snug but not bind up, make sure you clean the housing really well before inserting the new ring.

 

[tobytd]

NO oil in injection systems fuel

 

[diddler1954]

Watching you-tube vid of the ring change out, most were hacks. I figured it out, all was needed was to press the ring in the pump, I have 5thousands clearance all the way around.
The engine is rebuild, Yes you do add additional oil to the fuel for break in period, as per Sea-Doo.
I am new to the PWC spot, sorry to ask common questions, However, I do know the Rotex engine .
Thank you for your help, The craft runs great.