locogato11283 Posted August 26, 2006 Report Share Posted August 26, 2006 If I were going to build a cub motor........it would be a 4mil stroker/72 bore. Very reliable and pretty good power. since you mention the 72mm bore what is the cost comparison to 68mm bore?? power differences? Quote Link to comment Share on other sites More sharing options...
phx450 Posted August 26, 2006 Author Report Share Posted August 26, 2006 The bigger the Bore the more CC's and Compression right? I figure since I'm building a dune drag bike only If the biggest cub made is 3-5 hundred difference and is still reliable why not. At glamis i need all the help i can get. For years now people build a fast banshee and then put there 10 year old 85 pound kid on it to ride. They Haul Ass! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 26, 2006 Report Share Posted August 26, 2006 The big price differences really aren't in the cub itself, it's in the crank...once you go over 4mil, the crank goes up big time, and you have to trench cases as you know. Honestly...get the biggest you can afford.... Quote Link to comment Share on other sites More sharing options...
bigscary Posted August 26, 2006 Report Share Posted August 26, 2006 since you mention the 72mm bore what is the cost comparison to 68mm bore?? power differences? the 72mm cub is about 300 higher than the 68 bore just for the cylinders.... it requires a little different head configuration and some case clearancing for the cylinder to fit..... the HP difference between the two is very minimal.....but the torque is noticable.... Quote Link to comment Share on other sites More sharing options...
phx450 Posted August 26, 2006 Author Report Share Posted August 26, 2006 I'm going to go the cub route, overide 2-5 , possibly a 7 mill. Anything over 4 you have to modify cases right? Maybe i should stay with 4? Hmm? Quote Link to comment Share on other sites More sharing options...
alcoholbanshee Posted August 26, 2006 Report Share Posted August 26, 2006 Either go 4mil or 10mil........the price is the same 7 or 10. Might as well get the biggest bang for the buck. It will cost about $250ish more for the 7/10 over the 4mil. This is because of the case trenching involved. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 27, 2006 Report Share Posted August 27, 2006 I'm going to go the cub route, overide 2-5 , possibly a 7 mill. Anything over 4 you have to modify cases right? Maybe i should stay with 4? Hmm? I'd look into a dunable override....they seem to be holding up quite well, and are MUCH more forgiving than standard overrides.... I'm thinking after today...my case is cemented for an override....huh Rog? :beer: Quote Link to comment Share on other sites More sharing options...
alcoholbanshee Posted August 27, 2006 Report Share Posted August 27, 2006 Yep, your bikes starting to come around! The override should put it over the top, make it one of the faster dune bikes out there. One other word ALKY!!!!!!! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 27, 2006 Report Share Posted August 27, 2006 Yep, your bikes starting to come around! The override should put it over the top, make it one of the faster dune bikes out there. One other word ALKY!!!!!!! You're getting ready to head out of town and work a gazillion hours with OT....I think you should dontate the funds to a fellow rider....lol... :beer: Have a safe trip out of town....good luck if you're going racing today! Quote Link to comment Share on other sites More sharing options...
alcoholbanshee Posted August 27, 2006 Report Share Posted August 27, 2006 Thanks....think I'm gonna pass on racing today. Gonna go get the tree stands ready. Bow season is close and time is short for me with work sending me out of town for a while. Quote Link to comment Share on other sites More sharing options...
phx450 Posted August 27, 2006 Author Report Share Posted August 27, 2006 I hope it turns out fast. Whats the difference with the standard 2-5 overide and the dunable overide? Alky would probably be the next step. Never ran it before, but i understand its a tad bit more work. What is all needed for alky? float bowl modification, new needeles? You need to run the carbs dry at the end of the night right? Man why cant i be some skinny kid and put half the money in the bike!@ Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 27, 2006 Report Share Posted August 27, 2006 Man why cant i be some skinny kid and put half the money in the bike!@ Buddy...you ain't lying.... Dunable overrides just started to come around and be tested lately. Standard overrides have been around for a long time. Standard Override: Allows upshifting under full power without using the clutch, in the cut gears (2-5, whatever)... HOWEVER...you MUST pull the clutch in BEFORE you let off the gas. If the motor is not pushing the bike, you have to pull the clutch... You might be able to get away with it once...by accident. It will bend shift forks if you don't. Dunable Override... All the benefits of above, but...you can use it like a normal tranny. Let off the gas, use the clutch...putz around. But...when it's time to drag race, you can bang gears without a clutch. The ONLY drawback, if it's done right...it's a little more money. But, not much. My advice is a 1-5 Dunable override... You're going to lose 6th gear anyway you look at it. Alky is gonna be my next step...maybe after this season. The carbs have to be modd'ed to flow alky, you have to run about twice as much alky through your motor as gas...but, it will run cooler, and you'll get a 8 to 20 percent increase in power....all depends on how well you tune it in. Kehin carbs can be convereted to alky pretty easily, but can not be converted back. Once you drill out the dump tube, it can't be replaced. Mikuni's can be converted back and forth. If you went to the dunes every weekend....you'd need to purge your system when you got done riding...or once you get home. Some people make a huge deal out of purging, but it's really not that big of a deal... It's not like "if you shut your bike off for 2 hours to go eat and come back you gotta purge it or anything...".... Hope this helps. Daj... Quote Link to comment Share on other sites More sharing options...
phx450 Posted August 28, 2006 Author Report Share Posted August 28, 2006 Duneable override huh? Sounds almost like a manual auto! I like the idea on the tranny, i see a bunch of people lose time on shifts. Quote Link to comment Share on other sites More sharing options...
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