13RAZOR13 Posted January 19, 2004 Report Share Posted January 19, 2004 hello im new to this forum:) . i have a 87shee this motor was rebuilt over 4yr's ago and its time-- .my wife bought me a 4mil short rod stroker crank (I Love That Women) and im looking for the best way to set up the motor, I would like to keep it stock looking , I was told that if I use two stock base gaskets and work the head (cut eighth-thous.and rework the domes for proper squish) is all i would need is that trully it ?My bike has a 7degre key and a lightened flywheel plus pipes and heavy duty clutch, i mostly drag race. . thanks for any info or suggestions Quote Link to comment Share on other sites More sharing options...
Dextreme Posted January 19, 2004 Report Share Posted January 19, 2004 You can get special pistons that are designed for your +4 stroker crank so you don't have to mess will plates and extra gaskets. They cost a little more than the typical piston, but its more stealthy. Quote Link to comment Share on other sites More sharing options...
bkabina Posted January 19, 2004 Report Share Posted January 19, 2004 Get in touch with passionre here on the forums he knows his stuff.As do many others. Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 19, 2004 Report Share Posted January 19, 2004 You can get special pistons that are designed for your +4 stroker crank so you don't have to mess will plates and extra gaskets. They cost a little more than the typical piston, but its more stealthy. I didn't know this. I know you can get special pistons for a long rod, but don't think for the 4mm. All your builder has to do is cut 2mm out of the head. Make sure to have the ports cut to match your riding and you'll love it. Quote Link to comment Share on other sites More sharing options...
Dextreme Posted January 19, 2004 Report Share Posted January 19, 2004 I didn't know this. I know you can get special pistons for a long rod, but don't think for the 4mm. All your builder has to do is cut 2mm out of the head. Make sure to have the ports cut to match your riding and you'll love it. I will check again because the pistons that I was referring to might be for the longrod +4stroker. Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 19, 2004 Report Share Posted January 19, 2004 If they are the 795 series wisecos, they are to compensate for the long rod only. Quote Link to comment Share on other sites More sharing options...
mcaf29 Posted January 19, 2004 Report Share Posted January 19, 2004 Go to Wiseco.com. Then go to powersports bar and select racer's choice. Scroll all the way down and you'll see that Wiseco sells a new piston kit for the H129. Its the 795 series pistons with a 2mm thick base gasket. Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 19, 2004 Report Share Posted January 19, 2004 Nice find. That's for a long rod 4mm crank. If you use the short rod, you just need to use stock pistons and the spacer or cut 2mm out of the head and have the domes done. Quote Link to comment Share on other sites More sharing options...
13RAZOR13 Posted January 20, 2004 Author Report Share Posted January 20, 2004 fixitrod thats kind of what i heard. i heard two things that the people with the 4mil stroker short rods dont need the pistons that have the off set pin they can use all the different reagular banshee pistons available out there but need to work the stock head but they told me i had to cut eighty-thous. and then reshape the dooms and add two base gaskets- .2nd the people using the short rods are faster than the people using the 4mil stroker with a long rod because of the torque and angle of the rod on the short rod not to mention it will rev faster. . So the real ? for me is that is it true that all i have to do is cut "2mil" out of the head and plus the doom work? . the cut answer is what i need to know? . i am thankfull for all your advice and suggestions Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 20, 2004 Report Share Posted January 20, 2004 No problem, I have a 4mil stroker. You are right about the difference long and short rods. Quote Link to comment Share on other sites More sharing options...
13RAZOR13 Posted January 20, 2004 Author Report Share Posted January 20, 2004 fiitrod . so wich pistons? . Im thinking of using the drop port pistons that TRICK RACING have? . Which ones do you have? Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 20, 2004 Report Share Posted January 20, 2004 I have a long rod so I used the 795 series. I used the long rod for reliability. I'd just use wisecos. Ask your builder. Quote Link to comment Share on other sites More sharing options...
boonman Posted January 20, 2004 Report Share Posted January 20, 2004 The only possibility to use anything other than a "stock" sized piston, (and I don't mean bore size, I am referring to wrist pin height) is when you run a Long rod, which is a 5mm longer rod. Which means that the wrist pin is set 5mm higher than the stock location to compensate. now, on a stroker motor, we'll use your 4mm crank for example. You will move the piston 2mm higher in the bore, and 2mm lower in the bore. Thus, 2mm higher + 2mm lower = 4mm total added stroke. Now, in order to compensate for the 2mm lower side, you need to have the portwork changed to match it. You can use a spacer plate to compensate for the top end of the extended stroke, but this gives you an xtra place for an air leak to develop. Now, the .080" that you mention, is right about spot on. 1mm is equal to .0394" So, 2mm = .0788". This would need to be cut out of the dome, or use the spacer plate. Either way, to maximize the power that your motor can achieve, I HIGHLY suggest that you have it ported for the type of riding you do. Choose a reputable builder, and go from there. DO not skimp on the $$ in this department. It will piss you off in the end. Do it once, and do it right. The smile on your face will thank you. As will the toilet paper and cleaning bll wen you shit your pants from the power that the proper porting will give you with the 4mm stroker crank. With the normal length rod that you have, you need to use a stock pin location piston, and ggo from there. Decide which avenue you wish to pursue with the spacer plate or a cut dome. Get it ported, and go out and spank some ass!!!! Quote Link to comment Share on other sites More sharing options...
feature000 Posted January 20, 2004 Report Share Posted January 20, 2004 Wiesco also sells, well its made by Cometic a thicker gasket kit whick just include a thicker gasket for the head to compesate for the 2mm stroke. I am running the wiesco pistons and stroker domes putting it all in today and tomarrow. Quote Link to comment Share on other sites More sharing options...
shortys racing Posted January 20, 2004 Report Share Posted January 20, 2004 fiitrod. so wich pistons? . Im thinking of using the drop port pistons that TRICK RACING have? . Which ones do you have? you taklking about the vito's pistons?? Cut in the front for more exhaust timing?? But that leaves the transfers stock height....this will make it a lil' pipey. Quote Link to comment Share on other sites More sharing options...
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