yammie Posted January 16, 2011 Report Posted January 16, 2011 Wonder little about the differences on the cylinders thats out there. The powervalves and non and how long does they last and power output from them in trailport configuration. And what is the difference in the longrod +4mm crankand stockrod +4mm crank and benefits? What i want is an engine that is having a good powerband upp to topend and what rew numbers and max rew on the engine? Any inputs are welcome.. /Mikael Quote
BigRed350x Posted January 16, 2011 Report Posted January 16, 2011 Wonder little about the differences on the cylinders thats out there. The powervalves and non and how long does they last and power output from them in trailport configuration. And what is the difference in the longrod +4mm crankand stockrod +4mm crank and benefits? What i want is an engine that is having a good powerband upp to topend and what rew numbers and max rew on the engine? Any inputs are welcome.. /Mikael Powervalves are an adjustable exhaust valve that lowers your exhaust port duration and helps provide low end power. How long any engine will last goes directly to your maintenance and setup. It also goes a lot to the quality of the parts you use. The longer rods help reduce the side-load on your pistons as they travel. Draw a picture in your head of the crank and piston traveling up and down in the cylinder. A shorter rod puts more side load on the piston than the longer rod. The longer rod cranks also help smooth out the torque curve and power delivery. The 4mm stroke will add both power and torque. Give kevin at Herr Jugs racing a call and talk to him about what you want to do with your bike and what type of riding you do. He can help you get the cylinders that would best suit what you want to do, be it aftermarket cylinders or porting your stock cylinders. His number is in my signature. I would get your stock cylinders ported for whatever you want to do with your bike, and maybe step up to a 4mil long-rod crank if you can afford it. What bolt-on parts do you already have? There are plenty of things you can do to help these engines perform better before you should be considering porting or a stroker crank. - Jared Quote
yammie Posted January 16, 2011 Author Report Posted January 16, 2011 Powervalves are an adjustable exhaust valve that lowers your exhaust port duration and helps provide low end power. How long any engine will last goes directly to your maintenance and setup. It also goes a lot to the quality of the parts you use. The longer rods help reduce the side-load on your pistons as they travel. Draw a picture in your head of the crank and piston traveling up and down in the cylinder. A shorter rod puts more side load on the piston than the longer rod. The longer rod cranks also help smooth out the torque curve and power delivery. The 4mm stroke will add both power and torque. Give kevin at Herr Jugs racing a call and talk to him about what you want to do with your bike and what type of riding you do. He can help you get the cylinders that would best suit what you want to do, be it aftermarket cylinders or porting your stock cylinders. His number is in my signature. I would get your stock cylinders ported for whatever you want to do with your bike, and maybe step up to a 4mil long-rod crank if you can afford it. What bolt-on parts do you already have? There are plenty of things you can do to help these engines perform better before you should be considering porting or a stroker crank. - Jared Thank's Jared!! Seems like a guy i will deal with when it gets time for it.. Stuff i got is actually an RZ350 engine that was a good runner before i sold the chassie and keept the engine. There is no other than jolly moto pipes and some jetting and a little milled head. Going to have it rebuilt and vith a longrod +4mm crank, got a pair tmx34 mikunis to go on there when it is time for running. So.. well.. to leak little info about the bike is that the engine will be in an yamaha wr400-426 chassies that will be set up for long gravel road and offroad riding and will be competing against 450 mx bikes. How much power is in an 4-stroke 450 mx bike btw?? But i wanna go 2-stroke as i think it will be a fast bike.. /Mikael So that is why i want reability of it and there will be good maintiance offcourse to let it live long. Quote
sleeper06 Posted January 17, 2011 Report Posted January 17, 2011 hotrods +4mm crank and look up cp industries they make the cub cylinders for banshee motors and im sure make a cylinder you would like.You can make over 100hp with the rite set-up Quote
Wicked ATV Posted January 20, 2011 Report Posted January 20, 2011 Thank's Jared!! Seems like a guy i will deal with when it gets time for it.. Stuff i got is actually an RZ350 engine that was a good runner before i sold the chassie and keept the engine. There is no other than jolly moto pipes and some jetting and a little milled head. Going to have it rebuilt and vith a longrod +4mm crank, got a pair tmx34 mikunis to go on there when it is time for running. So.. well.. to leak little info about the bike is that the engine will be in an yamaha wr400-426 chassies that will be set up for long gravel road and offroad riding and will be competing against 450 mx bikes. How much power is in an 4-stroke 450 mx bike btw?? But i wanna go 2-stroke as i think it will be a fast bike.. /Mikael So that is why i want reability of it and there will be good maintiance offcourse to let it live long. If you Have the RZ motor i'd suggest to keep it going on the WR that motor will be tons of fun to ride with the Power Valves. I have 3- RZ's and love them! 2-350 and 1-RZ-500 You can always do a simple 4mm stroker on your RZ motor. We have a simple Gasket kit for them if you decided to build a +4mm to work with it. Take a look http://www.wickedatv.com/duportal30/home/detail.asp?iData=10652&iCat=306&iChannel=20&nChannel=Products As long as you buy a nice quality crank you should be in Good hands for your set up as well they are rebuild able if it ever a day comes something happens to it. Check out our Crank Section and see all the Crank options if interested. We build our own crank per order or we also carry off the shelf cranks as well. We do several of RZ350 up grade to +4mm for customers in many international locations. http://www.wickedatv.com/duportal30/home/detail.asp?iData=373&iCat=280&iChannel=8&nChannel=Products Roger Quote
yammie Posted January 24, 2011 Author Report Posted January 24, 2011 If you Have the RZ motor i'd suggest to keep it going on the WR that motor will be tons of fun to ride with the Power Valves. I have 3- RZ's and love them! 2-350 and 1-RZ-500 You can always do a simple 4mm stroker on your RZ motor. We have a simple Gasket kit for them if you decided to build a +4mm to work with it. Take a look http://www.wickedatv.com/duportal30/home/detail.asp?iData=10652&iCat=306&iChannel=20&nChannel=Products As long as you buy a nice quality crank you should be in Good hands for your set up as well they are rebuild able if it ever a day comes something happens to it. Check out our Crank Section and see all the Crank options if interested. We build our own crank per order or we also carry off the shelf cranks as well. We do several of RZ350 up grade to +4mm for customers in many international locations. http://www.wickedatv.com/duportal30/home/detail.asp?iData=373&iCat=280&iChannel=8&nChannel=Products Roger Ok.. been looking around little.. so much nice engine parts over there so it is hard to make up my mind..lol Rd/Rz is the same i guess with the ypvs system.. and i have couple of them lying around and also 2 500 engines to. What i want is an "bullet" proof bottom end +4mm crank with the race bearings and trued/welded. If i stay with the stock cylinders how much power would they be making on pumpgas ported and a fresh bore?? Any ideas on porting sice it gonna be in an MX bike? And what gear ratio should i have on the straight cut gear for the clutch basket? And a good thing is that you do international shippings on parts.. That is good for me.. /Mikael Quote
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