pp13bnos Posted June 21, 2016 Report Share Posted June 21, 2016 Right now I'm calculating it as billet around $1,200, who makes forged cranks in 7 or 10 mil? I ran a 7mm WSM in my dunner for a couple seasons. Cam was hesitant on using is on drag setup. Quote Link to comment Share on other sites More sharing options...
m671054 Posted June 22, 2016 Report Share Posted June 22, 2016 Clint has a waiting list a couple months long. If i remember correctly i was quoted 2500 or so to replicate jt frame and have clint build front suspension. If youve never owned a drag bike i would use jmads 4mil as your gonna burn it down learning to tune. Learn to make small motors quick first. It cheaper and easier to source parts. I would invest in a lighter chassis with the money saved on the motor. Then when your ready to upgrade you already have light stuff. Quote Link to comment Share on other sites More sharing options...
SOUTHTHIRTY Posted June 22, 2016 Report Share Posted June 22, 2016 Anyone thinking about building a lite SFM bike, should keep in mind they are a handful. If at all unsure of your riding skill,z .. build a chassis bike. Fyi, i own both.. sfm is a fun ride but the chassis is way more consistent. 10super is the smallest you should build. That cc will last you a few yrs. Quote Link to comment Share on other sites More sharing options...
SOUTHTHIRTY Posted June 22, 2016 Report Share Posted June 22, 2016 If you go 4mill just buy from jmadd.. it will save you a ton of $ and TIME. And theres not many guys on this forum that know more about drag bikes than jared. It will be a good friend to have. If you do this from the ground up you're gonna be over budget even with a 4 mil. I'll sell you a good running 421 Cub for $2000 to get ya started. I'll throw in OOF pipes (CPI BB or Sniper- your choice) and carbs (alky PWK 38mm or 39mm - your choice)for $500 more. The motor is ready to go with reeds, intakes 2-5 (non dunable) override, lockup, etc. Does not have straight cut gears. Quote Link to comment Share on other sites More sharing options...
Yamaha21 Posted June 22, 2016 Author Report Share Posted June 22, 2016 If you go 4mill just buy from jmadd.. it will save you a ton of $ and TIME. And theres not many guys on this forum that know more about drag bikes than jared. It will be a good friend to have. That's not a bad idea, if I can't get rid of my raptor I'll look into picking up his motor and just getting my chassis done until I get rid of the raptor and spend some time with the 421. Sent from my XT1585 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Yamaha21 Posted July 21, 2016 Author Report Share Posted July 21, 2016 So I've been doing a lot of reading and haven't been able to find a clear answer. If I'm looking to run around 100hp what wheel base should I be shooting for? How much to lengthen front vs. rear? It seems like people do it all different, curious to see what people claim is better. Sent from my XT1585 using Tapatalk Quote Link to comment Share on other sites More sharing options...
JTmachining Posted July 21, 2016 Report Share Posted July 21, 2016 So I've been doing a lot of reading and haven't been able to find a clear answer. If I'm looking to run around 100hp what wheel base should I be shooting for? How much to lengthen front vs. rear? It seems like people do it all different, curious to see what people claim is better. Sent from my XT1585 using Tapatalk U doing a stk frame or no. 100hp is low for drag racing these days Quote Link to comment Share on other sites More sharing options...
Yamaha21 Posted July 21, 2016 Author Report Share Posted July 21, 2016 So far my plan is to stick to stock frame, I'm not looking to take loco down at KOTR or anything, just have a fun, fast hill shooter for the dunes. Sent from my XT1585 using Tapatalk Quote Link to comment Share on other sites More sharing options...
JTmachining Posted July 21, 2016 Report Share Posted July 21, 2016 Ez then. -2+2 drag arms, spindle, stem. Swingarm +10 to +14. Set up for hill is diff than flats Quote Link to comment Share on other sites More sharing options...
Yamaha21 Posted July 21, 2016 Author Report Share Posted July 21, 2016 Ez then. -2+2 drag arms, spindle, stem. Swingarm +10 to +14. Set up for hill is diff than flats I don't really like flat land racing so I'd definitely want to set it up for hills. is the range on the swing arm from 10" to 14" a preference thing? Just out of curiosity, if it were to be a flat land drag bike how would you then recommend the setup? Quote Link to comment Share on other sites More sharing options...
JTmachining Posted July 21, 2016 Report Share Posted July 21, 2016 I don't really like flat land racing so I'd definitely want to set it up for hills. is the range on the swing arm from 10" to 14" a preference thing? Just out of curiosity, if it were to be a flat land drag bike how would you then recommend the setup?Ya and no. I like to use short swingarms fo hill...POWa and paddles are a factor in all this to Quote Link to comment Share on other sites More sharing options...
Yamaha21 Posted July 21, 2016 Author Report Share Posted July 21, 2016 Yeah, right now I'm trying to nail down my frame design to get the work started on it. Motor will be Redline 4 mil alky. Then I can play around with Paddles and gearing once I get everything thrown together and adjust from there. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted July 21, 2016 Report Share Posted July 21, 2016 I ran +8 swingarm and -2/+2 drag arms on a 421 stock frame and it worked pretty good. 1 Quote Link to comment Share on other sites More sharing options...
elconor Posted July 21, 2016 Report Share Posted July 21, 2016 I ran +8 swingarm and -2/+2 drag arms on a 421 stock frame and it worked pretty good. Thats a good setup. With a 8" arm id consider 8 extremes. Maybe 10 extremes but you might need a 10" arm if it makes good power. Depends if you like to ride wheelies every gear or like to keep it down and lightly lift. I had a 421 cub on a +4 frame with a 10 arm with 10 extremes and it floated the tires nicely through 2nd and 3rd gear. I had a 8 arm on it but it was a handful to control if it bit good and hooked. It would lift in 4th uphill. All depends on your riding style, your power to weight ratio etc.. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted July 21, 2016 Report Share Posted July 21, 2016 Buy the 4mm DM in LSR chassis for $8500 and be done. Ride it on the flats or hills. Quote Link to comment Share on other sites More sharing options...
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