Timing 01 RMK 800

[Rockpicker]

Hey, can anyone help me with a timing question?

Specs say 25 or 35, 'will have to look again' @ 3500 rpm.

Do I need the ignition switch on Regular or Premium, or will it make any difference?

Thanks, Jim

 

[X2Freeride]

Hey, can anyone help me with a timing question?

Specs say 25 or 35, 'will have to look again' @ 3500 rpm.

Do I need the ignition switch on Regular or Premium, or will it make any difference?

Thanks, Jim

01 XC 800 Specs from the online manual.

01 XC800
Engine Model Number S8070POA1
1952 A
Alternator Output 280 watt
Bore x Stroke (mm) 85 x 70
Displacement 794
Carburetor/Throttle Body 2 Mikuni
Carburetor Model TM40
Main Jet 460
Pilot Jet 45
Jet Needle 9EFY2-61-3
Needle Jet P-8
Cutaway 2.0
Idle Mixture Screw 1 3/4 Turns
Idle RPM +/--200 1300
Cooling Liquid
Cylinders 2
Ignition Timing 25 @ 3500
Ignition Type Digital TPS
Oil Injection Polaris Blue
Spark Plug Champion RN
57YCC


So its 25 degree's at 3500 Rpm's.

The switch doesn't matter because your setting the timing at the lower RPM range and the switch effects WOT timing.

 

[X2Freeride]

Just for reference and another example as this does come up fairly often and is a good reference to have.

*******NOTE*******

These apply to 800 engines ONLY the 700 runs a much difference curve, and a 700 curve WILL NOT work on the 800 engine. Nor will the 600, 500 or 440. Even though I have seen several people try to use them on 800 engines.

The 02 with the TPS was

29 to 29.5 degree's at 3200 RPM's @ BDC with TPS disconnected. Spec says 29 but I have ran a few with pipes at 29.5 on pump fuel with no problems.

You also need to remember that the TPS also retards the timing in certain situations once the temp gets too high. Which is why you set it with it disconnected.

03 800 Timing was 28 degree's @ 3200 RPM's

04, and 05 used similar timing with slight changes in the mid range numbers. But basically the same as the 03 was.

 

[Rockpicker]

Sorry Freeride been off for a few days.

So, you have given me very good info. Thank you, but...........

Now I have more questions.

I have swapped out my 800 with a rebuilt 700 and used all the electrical, carbs and pipe from the 800.

Should I still use the 800 timing specs?

Also on this 01 do I need to unplug the TPS before setting the timing.

When I pulled it apart I scribed the stator plate and put it back where it was but I don't know if it was correct before. Just got this sled.

Thanks for the help, Jim

 

[rocket]

I'm making the assumption that your 700 is a non-VES - correct me if I'm wrong and some of this won't be applicable to your swap. You'll need an ignition box from a 700, but the rest of the electronics from the 800 can be used. However, the 800 used the newer Kokusan ignition and most of the 700s out there were equipped with the older Ducati ignitions. The problem is that only in '01 was there a non-VES 700 that had the Kokusan ignition, so the CDI modules aren't easily found used. If you can find the right CDI box, it's "plug and play". if not, you're going to have to buy the right one or have the 800 one reprogrammed with the right timing curve. Otherwise, everything could be swapped back to the Ducati ignition parts that are easier to find for the 700.

 

[Scott]

Also...I think I remember that that the RMK and the XC had different timing also.

 

[Rockpicker]

Ok we need more worms in the can!!!

The engine I installed is a 99, I changed the head to an 02 XC 700 head to get my thermostat housing pointed the right direction.

I used everything from the 800. Mag housing to recoil.

So do I understand from Rockets post that I would be best to have my CDI reprogrammed and then use the timing spec for an 01 700 which I believe is 20@3000 rpm, "will have to look again".

Cross referenced parts between 700 and 800 for 01 and the CDI is the only difference. Stator, coil and ign switch are the same.

Thanks again guys, it's all together, starts and runs great, just want to make sure I have it right so I don't burn down a new engine.

Will have plenty of time to get it right before we get any white fluff in South Dakota.

 

[Scott]

Make sure you check whether the XC and RMK timing curver are different. I suspect they are since the XC was marketed for elevations of 0-3k feet and the RMK for 3k feet and above.

 

[X2Freeride]

The engine I installed is a 99, I changed the head to an 02 XC 700 head to get my thermostat housing pointed the right direction.

I used everything from the 800. Mag housing to recoil.

So do I understand from Rockets post that I would be best to have my CDI reprogrammed and then use the timing spec for an 01 700 which I believe is 20@3000 rpm, "will have to look again".

Cross referenced parts between 700 and 800 for 01 and the CDI is the only difference. Stator, coil and ign switch are the same.

Thanks again guys, it's all together, starts and runs great, just want to make sure I have it right so I don't burn down a new engine.

Will have plenty of time to get it right before we get any white fluff in South Dakota.

You are correct in thinking that you need the CDI and from the 700 for this to work. The 800 one will not work. Timing you posted for the 700 is also correct.
Always unhook TPS to set the timing as well.

 

[X2Freeride]

Make sure you check whether the XC and RMK timing curver are different. I suspect they are since the XC was marketed for elevations of 0-3k feet and the RMK for 3k feet and above.

They are, but the difference is minimal. The XC curve isnt enough different to where it will cause you problems running at elevations under 8K feet. After that you may run into problems.

 

[Rockpicker]

Thanks for all the help guys!

I found a brand new CDI on E-bay yesterday for $150, score!

Have all the info I need, I think.

Looking forward to snow and riding this sled as I put less than 10 miles on it after purchase last winter before the 800 seized up.

Only thing left before winter will be to change the needles and needle jets as the 700 uses a different # and mine are a little worn anyway.

I am ready to rip some powder a new one!

Thanks again, Jim

 

[X2Freeride]

No problem glad we were able to help.

 

[1enick72]

Thanks for all the help guys!

I found a brand new CDI on E-bay yesterday for $150, score!

Have all the info I need, I think.

Looking forward to snow and riding this sled as I put less than 10 miles on it after purchase last winter before the 800 seized up.

Only thing left before winter will be to change the needles and needle jets as the 700 uses a different # and mine are a little worn anyway.

I am ready to rip some powder a new one!

Thanks again, Jim

I’m getting ready to do a similar swap in a 2000 rmk. 800 engine locked up and I’m putting in a non ves 700. So you used flywheel, stator and coil from the 800 and then got a 700 non ves cdi (non Ducati)? What jets did you end up using in the carbs?

 

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