Help!! In over my head

[Blueside]

Hey guys I just recently purchased a 2003 700 RMK chassis with a blown motor, pistons crank etc.

I had an 02 800, I've put the engine in the RMK and hooked everything up just had a few questions before I try and start it.

Will the RMK 700 CDI work on 800 motor? the 700 has PERC but the 800 CDI didn't. Is there anything else I need to change.

The fuel doesn't seem to be flowing very well from the tank, is there a need to prime the lines?

I know these may sound like stupid questions. I just want to be sure I dont fry anything.

 

[rmkboxer]

it should run the way it is, but to do it the right way you should put the flywheel, oil pump and the pullchord housing on the 800 from the 700. the timing is different from a 700 and a 800 but it will still work for the cdi and on the fuel if you have gas in the tank there is no priming. the pump will pump in but you have to pull the motor over to do it. you can run it as it sits. make sure you bleed the oil pump with the screw that is on top of it

 

[Mark's RMK]

Motor change

I always use some premixed fuel for the startup (50:1) and then take a wire and hold the oil pump lever all the way open as you watch the oil work it's way to the 4 various injection spots, 2 on the carbs and 2 on the crankcase. The oil moves kind of slow at idle so don't worry too much about that. I know some guys actually prime the small oil lines to aid in getting the oil there quicker.

 

[whoisthatguy]

Older sleds usually require that the fuel pump be rebuilt because it takes way to many pulls to start the engine or to get the carbs primed. There are two nickel size clear plastic disk valves that need replacing in the fuel pump. The cheap way to rebuild it however, is to flip the disks over and reinstall them upside down. They get dirt between the flat disk and the housing, this causes them to become rough and loose their seal. By flipping them over, you are then putting a smooth surface of the flat disk against the valve housing, which allows a good seal again.

 

[whoisthatguy]

Put in new piston rings so that you get better than 145 psi pressure. Check the cylinders to see if they need to be nicosiled. If you are in that far, you will also need new high temperature O-rings on top of the cylinders. If the crank was bad, you are talking some dollars for a rebuilt one. Depending on the miles, you may want to rebuild the water pump while you got it apart. They go out every 1500 to 2000 miles, as I recall. But you need to have experience to do rebuild them correctly. When reinstalling the engine in the sled, change out the front rubber engine mounts and double nut the engine to those mounts. Set the left side torque stop tight but make sure the one you have has not burned itself up. You can file down a ridge on the bottom side of the cylinder head, so that air will not become trapped beneath half of the cylinder head. Which would be a good thing to do. And then there is the matter of the absence of a top drip hole in the crankcase, at the PTO end. The lack of a drip hole causes the PTO bearing to prematurely go out. You might want to drill one in that directs drip oil towards the PTO bearing.

 

[sledhooligan]

Pretty sure your fly wheels are diffirent 02 had 14* and 03 had 18*. CDI needs to match flywheel. So if you put the 700 flywheel on it might work. What head do you have on it? Running a non det head with det ignition might be a problem. Also the perc oil pumps vs the 02 and older pumps are diffirent. 03 pumps and newer are made to go backwards. I also have 03 non perc 800 cdi and wiring harnesses and a 800 03 perc cdi pm me if you want one.

 

[clutch man]

Hey guys I just recently purchased a 2003 700 RMK chassis with a blown motor, pistons crank etc.

I had an 02 800, I've put the engine in the RMK and hooked everything up just had a few questions before I try and start it.

Will the RMK 700 CDI work on 800 motor? the 700 has PERC but the 800 CDI didn't. Is there anything else I need to change.

The fuel doesn't seem to be flowing very well from the tank, is there a need to prime the lines?

I know these may sound like stupid questions. I just want to be sure I dont fry anything.

Just put all the electrical from your 03 700 motor in your 02 800 it will all work
All!!! of it stator, flywheel,CDI, oil pump then set timing for the 03 motor this will work good Have done it!!
too prim for fuel (make sure gas is on! fuel in tank! carbs our clean! then when you our ready)HAVE CHOKE FULL ON THEN PUT 40 TO 1 RPE MIX IN THE SPARK PLUG HOLE! ABOUT AN 1/2 OZ PER CYL THEN INSTALL PUGS THEN START. REPEAT IF IT DIES. WHEN IT STARTS IT WILL PICK UP FUEL FAST.

 

[Blueside]

Thanks guys! Finally home with some time to tinker.
Sorry, to clairify, the 700 was in the sled when I bought it, the 800 I had and was recently rebuilt.
The way it sits now, it has the 800 motor with 800 (non Perc) CDI. Had the 700 CDI in with the 800 parts, but no spark.
I have a spark with the 800 CDI.
I'm not sure if the 03 CDI has DET in it or not? (this is a knock sensor? should there be wires out of the old head running to the CDI?)
If it does then I need to find heads with DET inorder to run this CDI?

I think I'm gonna leave the non perc 800 CDI in it now, as I'm unsure how to do the timing correctly. and then see if I can find someone to set the timing for me.
How difficult is it?

Thanks again

 

[Snomofo]

2003 chassis

As far as the fuel flow goes, make sure the screen on the fuel line is not plugged up, and there was a fuel pump relocation recall on that sled moving the fuel pump from the side of the oil tank to below the carbs on the chassis---keeps it from running out of fuel at low speeds and the pump does not work as hard.

 

[Blueside]

The pump is located under the carbs, I've poured in small amounts of fuel and oil, she will fire but only for about 3-5 seconds then dies, and the plugs look fouled with oil. Does this sound like a jetting issue?

 

[skibreeze]

Are the carb bowls full of fuel? I have had issues starting sleds, so I fill a spray bottle with gas and then spray it into the airbox, start it and keep spraying for awhile, you can tell if it wants to run on it's own or will only run by spraying in more fuel. At that point, if it keeps running by spraying, it's got to be a fuel issue, bad pickup, bad pump, clogged carbs, stuck float, etc.