98/99/00 WR400 Big bored to 444
Posted October 10, 2006 - 02:31 AM
im intending to bore up to 444cc.most likely to go with the stock YZ426 stuffs , bore the cylinder to fit a 97mm piston.
can i know how many of you guys have actually done it, esp with the 98 models.
99 and 00 models may join in too.
Pros and cons , against high revving and overheating issues.
i would like to have the firm reliability after the big bore.
and to know the feelings the happy big boreRS, haha .
please share more experience with me, like fixing it up , maintaining etc etc.
what ever things to make me go for it.
Thanks guys ! cheers !
Posted October 10, 2006 - 06:33 PM
actually i just wanna know how many have done the bore, and their personal reviews about it. what faults they encounter , jettings etc etc.
thanks guys, and hope to get more reviews. cheers
Posted October 10, 2006 - 09:13 PM
Posted October 11, 2006 - 06:45 PM
gas wont be much of a problem in my country, temperature might be a pain.
1) any more 400s that has the bore kit?
i am most likely to get it done on my 98 wr400.
2) What are the maintenance like after the big bore, just oil change after every few rides, valve clearance etc etc. i wont wanna be opening up the top after every 1 or 2 rides to check any loose or burned parts. please advise
3) i need pointers to look out for. this is what i know i should get.
a) 444 bore kit from lukesracing
OEM 426 crank assembly
4) most important of all. is fixing up everything nicely easy?
will a normal mechanic do the job? i only know 1 guy who did the 444bore on his 426 in my country, bust his top after 3 mths. im not sure what went wrong. not fixed up by professioner?
i will wan the bike to be as reliable as before, so i wont save on the parts to get things right. i need pointers from you experts out there.
thanks guys !
Posted October 11, 2006 - 07:03 PM
Posted October 11, 2006 - 07:06 PM
Posted October 11, 2006 - 07:12 PM
so no one actually broke their top with this kit before?
Posted October 11, 2006 - 07:17 PM
Posted October 11, 2006 - 10:37 PM
As far as your buddy's issues, maybe he needed to run race gas (hi-comp piston) and didn't...maybe he didn't keep his oil changed...maybe wore down the cam gear on the crank and the cam chain jumped a tooth...?
Posted October 12, 2006 - 12:50 AM
but what i heard from a rider buddy saying that the yz426 crank assembly will not fit into my 98 wr400 , as the 98 have a smaller crankcase compared to 99 and above?
any 98 guys have problem encountering fitting in the yz426 crank assembly?
lots of nice and great feedbacks from you guys in TT.
but lots of negative from my locals , sadly.
Posted October 12, 2006 - 11:12 AM
I told you if you use the 426 crank the clutch and counterbalancer drive is different and you will have to replace all the other stuff too. It's not necessary.
Lukes will sell you everthing you need.
Posted October 12, 2006 - 09:22 PM
Posted October 13, 2006 - 02:30 AM
i read thru some old threads abt the difference between the YZ 426 rod and WR 426 Rod. the WR ones can last longer and the YZ ones are more for racing... is that true?
so for the stock parts .. i should be getting WR parts?