Very informative and good video! I think the same ideas work on a 250 cc to? Also, if you want more peak power, should you do the timing fix the other direction?
should work yep. never tried timing the other way #2 setting retards it a bit and takes some power out of the whole curve when we tried it, so i wouldnt go any farther that way
196 degrees on the exhaust is quite a lot, you are getting into road-racing territory with regards to the exhaust, I'm not 100% sure its the right thing for an enduro bike, having said that I guess the power valve helps calm it down. I used to run a Lectron but they seem to allow dirt into the engine, I think its down to the way that there is a vertical split in the carb, look out for dust on the back of the slide, if you see it then dirt is going into your motor, it will take out the mains, big end and the bore! I now run a STIC setup but that's a different story. I also skim heads, I run around 40 thou squish clearance, I have opened up the bowl so I'm running around 12.8:1 CR, not as high as in the video but then again I run pump fuel. (based in the UK, its moderately crap fuel!) Only on the later heads does it open up extra waterways when you skim the heads, I leave them open, from memory the earlier head already has them fully open anyway.
The mod to the powervalve keeps basically the same curve, just adds 1000rpm on top at the same torque.. if you have the powervalve set right. which for me on the dyno was red with 3 turns in with this setup
I'm sorry, but does he say to just grind the pad on the power valve so it opens to the maximum and then grind the exhaust port to match the higher position of the powervalve, or does he say to grind 2-2.5mm of the top edge of the port and then grind the pad of the power valve so it matches the higher port edge?
Just noticed in your shorts that you use an engine Dyno. What HP would that be at the rear wheel? (If you had one😁)
Very informative and good video! I think the same ideas work on a 250 cc to? Also, if you want more peak power, should you do the timing fix the other direction?
should work yep. never tried timing the other way #2 setting retards it a bit and takes some power out of the whole curve when we tried it, so i wouldnt go any farther that way
So few reactions, although it is so interesting.
196 degrees on the exhaust is quite a lot, you are getting into road-racing territory with regards to the exhaust, I'm not 100% sure its the right thing for an enduro bike, having said that I guess the power valve helps calm it down. I used to run a Lectron but they seem to allow dirt into the engine, I think its down to the way that there is a vertical split in the carb, look out for dust on the back of the slide, if you see it then dirt is going into your motor, it will take out the mains, big end and the bore! I now run a STIC setup but that's a different story. I also skim heads, I run around 40 thou squish clearance, I have opened up the bowl so I'm running around 12.8:1 CR, not as high as in the video but then again I run pump fuel. (based in the UK, its moderately crap fuel!) Only on the later heads does it open up extra waterways when you skim the heads, I leave them open, from memory the earlier head already has them fully open anyway.
The mod to the powervalve keeps basically the same curve, just adds 1000rpm on top at the same torque.. if you have the powervalve set right. which for me on the dyno was red with 3 turns in with this setup
I'm sorry, but does he say to just grind the pad on the power valve so it opens to the maximum and then grind the exhaust port to match the higher position of the powervalve, or does he say to grind 2-2.5mm of the top edge of the port and then grind the pad of the power valve so it matches the higher port edge?
I would grind the recess in the powervalve flapper first to get more range, then match your cylinder to it
👍👍@@user-vs9ju2yt9i
for low effort power can i only grind the side power valve sprocket things?
sry not sure exactly what you mean
Who in alberta would you reccomend i send my cylinder to too get ported
Split Second Ralph or Tom (Mot's)
Do u lose torque or gain torque in this setup
gain tq all the way through.
What is the power increase with the power valve mod
You hold peak torque another 1000rpm or so. So do your math based on that
@@user-vs9ju2yt9i holy shit u can get lot of horsepower out of these 300
What year is this cylinder?
17-19