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View Full Version : what is the BEST bore for MX 416? 426? 440?


NTPRacing#19
09-24-2002, 09:11 AM
I want to know what is the best bore for MX. I know how to build up the motor right so i dont need help there. ijust need to know from you guys who race them and have competed against these bores, what is best. IM looking for strong bottom end and midrange but with out sacrificing anytop end. thanks
DarkStarRacing
09-24-2002, 09:28 AM
416
Evan
09-24-2002, 11:01 AM
Without a doubt the best motor for MX is the 425 with a 13:1 ratio. I have talked to several engine builders and they say this is the best, they run it in TT and MX Now unless you put a carillo rod in it, some say its not reliable, me I have not had trouble, I race only MX so its not seeing high RPMS also I dont have one of those rev boxs that are likely to blow your motor. But if you want reliability and good power go with a 416, with a 12:1 ratio. I see 416s walk over 440s at the track I race at, and yes they are identically setup too IE: TC440 vs TC 416.
NTPRacing#19
09-24-2002, 01:09 PM
yea im thinkin about a 416 kit with all the right mods to walk all over some 440's. ive ridden a 416 before and it was so strong and the guy said it was runnin like **** cause it had a little less compression due to a gasket leak. So i can imagine how hard they really pull!:devil
flying400ex
10-24-2002, 05:50 PM
A TC416 will not beat a TC440 how whould that be possible? The 440 is bigger and put out more power.
Derek
10-24-2002, 05:57 PM
cause it revs faster.
Sick0
10-24-2002, 06:04 PM
Yeah I would go with the 416 kit. The 416 will make its power faster than a 440 will. The 440 will end up catching and passing a 416 on a longer staight or some thing.
10-24-2002, 06:04 PM
call tom at tc **** steer you in the right direction and he will tell u that the 425 is the best for the mony out there. it is the biggest bore you can go without having to resleve. but give him a call
Dave400ex
10-24-2002, 07:30 PM
Yeah call and talk to different Engine Builders. TC, Sparks, Duncan, Trinity, Powroll, Hetricks, or others I forgot.
10-24-2002, 07:40 PM
Sparks 416 National motor :macho
300EXrider02
10-24-2002, 08:33 PM
go with the 416, talk to YZROOSTINYA he knows all bout that crap:D
oynot400
10-25-2002, 08:27 AM
There are some 416 and 426's in my area that fly. They eat my 440, I can not deny it. I know for a fact tha tc built one of the motors. If you want to make power, stroke it. A stoked motor of the same displacement as a bored one, will produce more power.