Recent content by Mike Grafas

  1. Mike Grafas

    Anyone use more than one anti-siphon valve?

    After my porting and bore job I got my ski dialed in pretty close to where I want it, just has to mess with idle screws to get it to idle after first touch of start button But after I do a wot run, maybe 10 seconds, I let off the throttle and coast to idle speed, if I hit the gas it feels like...
  2. Mike Grafas

    Cant find answer on carb tuning

    Thank you, I had already seen that link and couldn't find anything that was close to mine with dual carb, but before I made this post I was only going to go up one jet size on the high but now I'm going up to just to be safe because someone mentioned it
  3. Mike Grafas

    Cant find answer on carb tuning

    Unfortunately I don't have an engine builder, I do all the work myself besides the actual bore. But I'm going to go with 140 Maine two turns out and hope I'm on the rich side unfortunately I don't have an engine builder, I do all the work myself besides the actual bore. But I'm going to go with...
  4. Mike Grafas

    Cant find answer on carb tuning

    I do get what you are saying about over thinking this but I am just replying to other replies, someone said to lower pop off, I was asking why would I lower pop off if I still have stock FA with all three screens, unless the manifold pressure is decreased then I would lower pop off Also my...
  5. Mike Grafas

    Cant find answer on carb tuning

    I understand how a carb works and it does not answer any of my questions that I have previously asked, only replies to others comments
  6. Mike Grafas

    Cant find answer on carb tuning

    Is there a reason to lower pop off? Just looking for an explanation because right now low end is spot on, not hesitation or bog And just curious about lowering it if I'm using stock flame arrestors, is it because of the larger bore and greater intake vacuum?
  7. Mike Grafas

    Cant find answer on carb tuning

    Just curious as to why mess with pop off? Should I lower it now, I'm at about 52 with stock flame arrestors
  8. Mike Grafas

    Cant find answer on carb tuning

    that was basically my question, anyone who has to jet their engine just goes off of previous people who did a trial and error I just assumed there was a mathematical way of getting close to a baseline
  9. Mike Grafas

    Cant find answer on carb tuning

    ok I understand that but for example, lets say someone takes a 701 and bores it to 84mm, now they are at a 754cc, lets also say the port it, and add a pipe. how would that person know what a good starting point would be for their motor, even like these engine builders building 1100cc engines...
  10. Mike Grafas

    Cant find answer on carb tuning

    I'll try those BUT my question is how does one figure out the correct jetting for a given motor Is there some sort of formula What if there was no starting baseline like forums or other motors to compare to and one must find the correct jetting You can't really say start anywhere because...
  11. Mike Grafas

    Cant find answer on carb tuning

    well I did my break in so far up to 50% throttle, still have yet to do up to 90% but the low end felt great, it was the top end I am worried about, being its ported I don't know how rich I need to go as a starting point to be over rich the last thing I want to do is go wot for a few seconds and...
  12. Mike Grafas

    Cant find answer on carb tuning

    Ok maybe this will be a quick answer or maybe it wont be 97 rn that I just bored to 82mm and freestyle ported, ada head 190psi, b pipe, enhancer etc 70 pilot 135 main Dual 38s prior to doing the bore it ran great, piston wash was good and very smooth power Now that I have bored and ported it I...
  13. Mike Grafas

    Engine shimming...A LOT of shims

    I'm all together now, going to break it in hopefully this week, but I'm definitely going to keep an eye on the mounts
  14. Mike Grafas

    Engine shimming...A LOT of shims

    that does make sense except for two things The bed plate loosened on the right side and I need a lot of shims on the left side, wouldn't I have to raise the right side being that wore down and two, I don't think it wore down 12.5mm, it didn't even look worn, maybe a few mm max And also for me to...
  15. Mike Grafas

    Engine shimming...A LOT of shims

    when I pulled the motor with the old couplers but current mounts it was shimmed with maybe a few 2mm I needed to pull the motor because the bed plate kept coming loose on the right side pulled the motor straight out of the hull, did my port work and tightened the bed plate bolts and put my new...
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