Thewhite Posted July 30, 2013 Report Share Posted July 30, 2013 Is someone ever machine the bottom of the banshee cylidner to reduce the height of the exhaust port ? I raise the question because I run RZ 350 cylinders with fucntional PV and I always foul plugs at low RPM. At low RPM my distance from top of exhaust port to top cylidner is 32 mm, 2 mm more than the banshee stock port. Do someone know if opening 2 mm more the exhaut port of RZ cyinders will avoid my foulling plugs issue? Maybe the Paul turner pipe require a larger blow down duration if compare with teh stock RZ350 tune pipe? My current jetting for a 4 mil se-up is main = 160 pilot = 40 Needle CGL on 4th clip air screw 2 turn out. mods are:K&N filterPWK 33 carbsBoss intakeV-force 2Cool-headPaul turner High rev pipe4 mil crankCylinders ported for 4 mil crank, the Passion Racing 12 portsZeeltronic (custom CDI with PV setting)I use the RZ350 stator and flywheel. All the RZ electronic is functional. I didn't done plug chop because I run out of sprak plug (foulling them). thanks Quote Link to comment Share on other sites More sharing options...
lms1977 Posted July 30, 2013 Report Share Posted July 30, 2013 If it is tuned right you should not foul plugs. When you say 4th clip on needle are you meaning clip is toward the top of needle? Quote Link to comment Share on other sites More sharing options...
Thewhite Posted July 30, 2013 Author Report Share Posted July 30, 2013 If it is tuned right you should not foul plugs. When you say 4th clip on needle are you meaning clip is toward the top of needle? 4th nothch counting from the top, so toward the bottom. in the past I ran others non PV set-up and never foulled a plug ... it should be the PV opening but would like opinions. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted July 31, 2013 Report Share Posted July 31, 2013 That's pretty rich on the needle. Maybe try moving the clip up a few notches. Quote Link to comment Share on other sites More sharing options...
Starwriter Posted July 31, 2013 Report Share Posted July 31, 2013 At low RPM my distance from top of exhaust port to top cylidner is 32 mm, 2 mm more than the banshee stock port. Zeeltronic (custom CDI with PV setting) But at low RPM, the motor is seeing the top of the powervalve as the port height, which should be considerably lower than the top of the Banshee exhaust port. I don't know specs, but that's just an assumption. Also, I'm pretty sure the Zeeltronic has adjustable settings for the powervalve positions. Of coarse, the lower the power valve is in the low position, the farther it gets away from the piston. At some point, that would be very bad. Quote Link to comment Share on other sites More sharing options...
Starwriter Posted July 31, 2013 Report Share Posted July 31, 2013 Yep, I thought so. "programmable max close and max open positions" http://www.zeeltronic.com/page/pcdi-10v.php Quote Link to comment Share on other sites More sharing options...
lms1977 Posted July 31, 2013 Report Share Posted July 31, 2013 move the needle to the second clip see if it helps at all. I have a 535 cheetah I run a cel needle in the 2nd clip from top when I drop the clip to the 4th it will try and foul the plugs if I putt around with it Quote Link to comment Share on other sites More sharing options...
Thewhite Posted July 31, 2013 Author Report Share Posted July 31, 2013 (edited) Ok thanks guy for the recommendation. I will try the 45 pilot with the needle clip on the second notch and open a 2mm more the PV at close position. I originally reduce the pilot to avoid fouling plugs. After having spoke to Jim of Passion Racing yesterday he recommend me to open more the PV. The too close PV position could have choke the scavanging and enrich the mixture. I will update ASAP, but I'm waiting on reworked domes: the one I got don't have sufficient squish clearance. Jim had to machine the lower of the cylinders to reduce the transfer port height to have acceptable duration with the 4 mill stroke, the cylinder were already ported for stock stroke. This forum ROCK, it's unbeliveable the amount of good info we can find here, the 2 stroke experts are difficult to find now. I had difficulties to get answer on the RZ forum. to answer startwriter on the PV setting: max PV opening = distance from top of exhaust port to top cylinder is 26mm min PV opening = distance from bottom of the PV to top of cylinder is 32mm (this foul my plugs) stock banshee: distance top of exhaust port to top cylidner is 30 mm, I will try this setting as the close position. Edited July 31, 2013 by Thewhite Quote Link to comment Share on other sites More sharing options...
Coupelx Posted July 31, 2013 Report Share Posted July 31, 2013 Most RZ guys are sheep, just following the herd. There is alot of great info here if you can find it. Alot of the guys with the info don't like to post because of all the fucking retards Quote Link to comment Share on other sites More sharing options...
Starwriter Posted July 31, 2013 Report Share Posted July 31, 2013 I gotta admit, I did have a bit of a brain fart, as far as port heights on this, in my earlier post, but most of my post was relevant. I wouldn't be too quick to put 45 pilots in it. I run 40 pilots in my 33mm PWKs on my SS duner and it likes it. As mentioned by others, raise the needle clip position, and see what happens. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 1, 2013 Report Share Posted August 1, 2013 That thing is gonna be a monster down low once you get it dialed in. If it is fouling plugs I would venture to say that you can get away with leaning up the needle quite a bit and maybe try a 155/158 main. But for some reason the 12 port really loves excessive fuel. Just a bit of a dance as to where the sweet spot is. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 1, 2013 Report Share Posted August 1, 2013 Also, have you speced all the electrical to Jims reccomendations? If its not lighting right, it won't jet right. Quote Link to comment Share on other sites More sharing options...
Thewhite Posted August 1, 2013 Author Report Share Posted August 1, 2013 Also, have you speced all the electrical to Jims reccomendations? If its not lighting right, it won't jet right. I currently have an issue with my domes and they need to be recut for pump fuel, I got 180 psi with only .022 as squish. Dome are curerntly in shipping to Passion Racing, Jim machined the bottom of my cylinders to lower the ports: cylinders have been ported for standard stroke in the past (all by Jim). At that time I forgot to refreash Jim memory about the machined cylinders when he cutted my domes. So I hope to receive the domes for mid August and run the beast with the suggested PV spec. I also need to syncronize my zeeltronic CDI with the actual 4 mil crank position, with my new child time is always missing now ... I will give update as soon I got something. This engine have been place a side for too long: home improvement took the entire last summer and this year pass too fast again. Do you know the exhaut port duration on your Passion Ice/TT engine ? Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 2, 2013 Report Share Posted August 2, 2013 Yeah, I will pm you the specs later though. I have to admit if Jim was re porting your cylinders he would of known that there was previous work done by him on those cylinders and he should of speced them accordingly. As long as he gets you right though it should haul the mail. Quote Link to comment Share on other sites More sharing options...
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