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  1. thedude306

    What limits RPM on clone engine?

    Everything is back in the sled and I am happy! It looks like after half a dozen WOT runs that we are going to be in that 6400 RPM range for max rpm. I am happy with that. Now to start playing with gearing. I think I can get more out of the engine as I am definitely losing RPM due to load...
  2. thedude306

    What limits RPM on clone engine?

    well it hit 6980rpm no load (just track and clutch in the air) with the new coil and no goofy stuff on the timing light. Hope it pulls into that 6500 on the snow. Also set the valves. It got darn cold here (-34C last night) so I pulled the motor again and I am making a parts run for a new...
  3. thedude306

    What limits RPM on clone engine?

    Im getting shocked holding the coil wire/spark plug wire at high RPMs. Definitely an issue. Picking up coil and new driver for the track tomorrow and will sort it out. Also need new clutch spring for the max Torque SS Engagement is back down to around 2200. Sled won't move if you are in...
  4. thedude306

    What limits RPM on clone engine?

    I need to edit this. I'ts more like 300 rpm. Which I still think is pretty good. My "no load" was with the back of the snowmobile raised in the air. Spinning the clutch/chain/track. My load testing was with my boy on the sled doing a test run and looking at the recall for max RPMs. BUT...
  5. thedude306

    What limits RPM on clone engine?

    WINNER WINNER CHICKEN DINNER! Thank you gentleman, found my old timing light and it is definitely the coil. Starts to flicker right around 6000 rpm (dropped a little after warm up) In some of my reading over the last couple days it seems there is some evidence that coil gap really effects...
  6. thedude306

    What limits RPM on clone engine?

    Great info on the coils. I never thought about the possibility of the CDI coil and controlling timing but that makes total sense. That's what our big 2 strokes on our 800 sleds are doing, (well with external CDI box) Timing light.... oi I think I have one of those in a drawer somewhere...
  7. thedude306

    What limits RPM on clone engine?

    The transistor logic makes sense. My carb is a bored out honda. I cant remember the jetting on it but it has been flawless as far as stating and performance (as far as i can tell). It was the recommended carb from NR racing. It runs rich when warm out (above 0C) They recommended the jetting...
  8. thedude306

    What limits RPM on clone engine?

    But how does it know to cut spark? Is it heat or a resistor or what? I'm as low as I can go on the gear ratios. My hub won't take a smaller gear. The sled will still spin it's track in the snow at 2:1 At 1.8 it won't spin but still has good power. And a 1.6 it is a slug off the line but...
  9. thedude306

    What limits RPM on clone engine?

    Another quick question, how does a coil limit RPM?
  10. thedude306

    What limits RPM on clone engine?

    Thanks I'll start there. For $18 it's worth a shot. Even if I can just start to tickle at the 7000rpm doorstep i'll be happy.
  11. thedude306

    What limits RPM on clone engine?

    I've gone as low as 1.66:1 gearing..... (18 tooth clutch with 30 tooth drive) with a 2.594 pitch 4 tooth driver for the track. I'm back up to 2:1 but need to mess with clutching. Want engagement at 3000rpms + sleds are different then karts but yes I have tried all gearing combos. I do have...
  12. thedude306

    What limits RPM on clone engine?

    Yup, no professional here! LOL I am just trying to push these engines to the max that I can to my abilities. I did spend countless hours polishing and tweaking the head. Well not tweaking, just getting all the imperfections out. I by no means thought I was building a champ engine. Just...
  13. thedude306

    What limits RPM on clone engine?

    I do have a bigger carb and AL fly wheel. Added it to original post. I wonder if coil is an issue? Maybe I'm expecting too much out of this engine?
  14. thedude306

    What limits RPM on clone engine?

    Hi all We are having great fun on our snowmobiles this year but I was having trouble getting the speed I thought I should and reached out to a facebook group and they got me chasing RPM and it turns out my tach was junk. Found a better one and I am now in test mode. I am getting 6000rpm on...
  15. thedude306

    choke on 208 pro point

    Hi all, I just wanted to add to the data base of info on these engines. We are getting the sleds ready for another season on the snow and I decided to add a choke cable to the dash of the sleds. Previously we have always had to lift the hoods to choke the machines. A real PITA. I found some...
  16. thedude306

    piston wear normal? (and con rod picture)

    Howdy all, I have my 208 apart to install a billet rod and remove the governor and just want to know if this wear is normal on the piston? I've got about 40 hours on the motor with 4-5 oil changes (I think this is the 5th) running synthetic 5w30 Oh, and this is what your stock connection...
  17. thedude306

    Pro Point 208 questions (electrical)

    Hi all, I'm modifying snowmobiles for the kids and have purchased and installed Pro Point 208 cc electric start engines. These go on sale and have a cast iron sleeve. They appear to be a great little engine...
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