SLOPOKE21 Posted December 3, 2009 Report Share Posted December 3, 2009 I HAVE AN 03 WITH HJR DUNE PORT, PODS, 20 OVER, MILLED HEAD, AND DMC PIPES. IM TRYING TO FIGURE OUT WHAT TO DO NEXT. EITHER GO WITH A 4MIL STROKER OR CHEETAH CUBS? I REALLY LIKE THE PORT JOB AND THINK THAT THE 4MIL IS THE WAY FOR ME TO GUY I JUST WANNA HEAR WHAT YOU GUYS THINK. AND ADVICE WILL HELP Quote Link to comment Share on other sites More sharing options...
sandman81 Posted December 3, 2009 Report Share Posted December 3, 2009 I HAVE AN 03 WITH HJR DUNE PORT, PODS, 20 OVER, MILLED HEAD, AND DMC PIPES. IM TRYING TO FIGURE OUT WHAT TO DO NEXT. EITHER GO WITH A 4MIL STROKER OR CHEETAH CUBS? I REALLY LIKE THE PORT JOB AND THINK THAT THE 4MIL IS THE WAY FOR ME TO GUY I JUST WANNA HEAR WHAT YOU GUYS THINK. AND ADVICE WILL HELP Im confused do you mean a 4mil stroker on stock cylinder or a cub with the stock crank. Do you know what a cub is? Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted December 3, 2009 Report Share Posted December 3, 2009 You're not going to be able to have your current cylinders re-ported for a 4mil. So if you go that route you'll need some new cylinders as well as the crank and pistons ect. My quetions for you are: What type of riding do you plan to use this motor for? What are your current supporting mods? And lastly, what type of budget do you have planned to put into this build? The stock stroke cubs are not well known for being a "freindly" duner, they are quite peaky. The 4mil stock cylinder or a 4mil cub would both be very at home on the dunes or the hill/strip. The cub tends to lean more towards a drag motor, the stock cylinder is very flexible as far as power delivery. Best bet is to talk to the builder you plan to have set you up and see what he has to say. But prepare yourself for the same questions I just asked and a few more. Quote Link to comment Share on other sites More sharing options...
yamaha11 Posted December 3, 2009 Report Share Posted December 3, 2009 i have a 4mm herr juggs stock cylinder motor and it hauls ass. also have a 4mm cub but its not as rider friendly as the herr motor. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted December 6, 2009 Report Share Posted December 6, 2009 No Offense Wildcard, but slopoke you need to contact Kevin @ HJR and ask him what to do. Normally, if you port a set of stockers for a dune port they're too far gone (too much metal removed) to report them for a 4 mil stroker. That's not gaurenteed to be the case, however... Call HJR first...my advice. Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted December 9, 2009 Report Share Posted December 9, 2009 i had passion do a port for my stock stroke, and jim was able to report the cylinders for the 4 mill when i had him do it. I dont know how aggresive of a port job it was and what to catergorize it as, i just told him what kind of riding i do! Cidy Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted December 9, 2009 Report Share Posted December 9, 2009 No Offense Wildcard, but slopoke you need to contact Kevin @ HJR and ask him what to do. Normally, if you port a set of stockers for a dune port they're too far gone (too much metal removed) to report them for a 4 mil stroker. That's not gaurenteed to be the case, however... Call HJR first...my advice. None taken Dave, you're right...I shouln't have said that with such absolutness. But, I've yet to ever see a set of stock stroke "dune" ported cylinders that had low enough transfer ports to be re-worked for a 4mil. -Brandon Quote Link to comment Share on other sites More sharing options...
alf44 Posted December 9, 2009 Report Share Posted December 9, 2009 Im getting ready too put a 4mill crank in my stock dune ported jugs and Chriss @ cascade who did my motor originally told me that the jugs can be reworked for the 4mill port timing. The stuff i dont get yet. Im also going too bore too 66mm and use blaster pistons. So Can ported jugs be reworked too add a 4mill or not??? Ive heard yes and no. So.... WTF! It sounds like its a matter of preferancce? Im here too learn so enlighten me. thanks. Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted December 9, 2009 Report Share Posted December 9, 2009 Going from a stock crank to a 58 stroke 115 rod crank will increase your transfer open time @6 degrees per equal deck to port roof measurement in the 120-130 transfer range. I personally wouldn't recommend transfer durations much over 130 degrees for most applications. That being said, you could get away with re-porting a bike with 194 deg or less transfer timing for a 4mil but the motor is not likely to rev out as high as the previous stock stroke setup. Most dune type ports will have 124 plus degrees of transfer duration. If you run too much transfer time, or too little blow down time you will typically end up with an engine that makes good power in the midrange over a short rpm range and falls on it's face early. But as Dave said, call the builder who did your cylinders and ask them...their defenition of a dune port could be different than mine. Quote Link to comment Share on other sites More sharing options...
okbeast Posted December 9, 2009 Report Share Posted December 9, 2009 None taken Dave, you're right...I shouln't have said that with such absolutness. But, I've yet to ever see a set of stock stroke "dune" ported cylinders that had low enough transfer ports to be re-worked for a 4mil. -Brandon I had a set of HJR's dune ported stockers and he could not re-port them for the 4-mil. I didn't wanna read through this whole thread but seemed like that question had come up, so there's an absolute answer, as of a year or so ago. Quote Link to comment Share on other sites More sharing options...
SLOPOKE21 Posted December 17, 2009 Author Report Share Posted December 17, 2009 hey thanks for the help guys. i was going to talk to kevin but i just wanted to see what some of you guys thought first. another question for ya. i still have the stock crank in now (not trued or welded) and someone was telling me that with the mods i have that if i go much more than a 20cc dome i was gonna risk separating my crank. the only mods i have are hjr dune/play port timing plate head is milled 32 thousandths pods and dmc pipes but soon to be shearer in frames. is there any truth behind this? Quote Link to comment Share on other sites More sharing options...
dajogejr Posted December 17, 2009 Report Share Posted December 17, 2009 I've seen stockers separate with just bolt ons. With an HJR dune/play port, it's probably safe to say you doubled your HP or close to it give or take. Yes. Stock cranks care tough as nails, but...they need to be welded to prevent separating. They are splined, so it's very, VERY unlikely for them to go out of phase, but they do separate, then it gets ugly. Good thing is stock cranks are very cheap....the parts that it damages if it separates usually aren't collectively. I would get it welded when you can...sooner rather than later. Quote Link to comment Share on other sites More sharing options...
rubberneck Posted December 18, 2009 Report Share Posted December 18, 2009 I have had stock cranks separate on 3 diff bikes, and none had more than bolt ons at the time. I will never own another banshee without imediately splitting the cases and welding the crank even if i plan to leave all internals and porting stock. Its a reliablity thing for me. Splitting and welding is easy and it sucks to go on a week long trip and lose a crank 2 days in. How come motors never blow up on the last day of the trip Quote Link to comment Share on other sites More sharing options...
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