Hi all Basically i got given a sr 125 for free from my girlfriends brother :yahoo: . it had been sitting for about a year! and had no top end as the last one was scratched/scored to fuck. anyways i bought a 172 kit but a bit reluctant to instal it as i dont fancy a repeat :lol: because it went bang (standard 125 cylinder 12000 miles cratch: )i was thinking maybe the main bearings are fukd aswell but im wondering if its totally necessary as i dont fancy the £180 bill at the local tuning shop and will have a try myself...Ive seen it done and REMOVED one main bearing from a case LOL when my m8 was teaching me 2 do it..plus ive practically studied the haynes manual??? Is there any other checks/procedures you reckon i could do or is new main bearings and seals inevitabely what i have to do?? setup is going to be malossi 172 (tick) MHR reed block polini straight inlet polini belt 25mm carb (tick) secondary gear up kit (tick) technigas rs (tick) Thanks in advance :cheers:
feel the crank, try to pull the flywheel up and down, any movement means there prittymuch fucked. it should move a little in and out (this is the endfloat) turn the crank by hand and watch the conrod/variator shaft to see if they run true (in a straight line) or if ether componants drift off centre when turned (are bent) the same go's for the crank webs (look into the engine, the big bits of the crank ether side of the conrod) if all this is straight, running true and feels like it turns freely and wihtout relaly tight spots (ignor the magnetic effect of the stator) and there is no up or down movement on the crank then id say its good... if in doubt about fitting a crank just dont do it yourself... pay somone the dogh, itl always e wortth it in the end.
Thanks alot for your help mate, i followed what you said and all seems to be well..will be building the top end today although i will eventuall upgrade to a bgm when funds allow..i know exactly what your saying mate (about paying someone to do it) i think i might this time but thats the LAST time im paying someone to do it, i definately wana learn how to do it some time soon Cheers bruv
standard motors sometimes break up the rings if something gets in there. its a/c so if someone ran it with the cover off it could have heat seized. make sure you oil up the bearings and crank before you install anything it has been a year after all then prey :cheers:
yh definately will do mate..as its my first time doing it solely on my own and without any help lol will keep u posted on how it goes!! Cheers :good:
