best way to break a bike in

[yamahaman623]

do you know what the best way to break a four stroke fourwheeler is. just rebuilt my and i was wondering

thanks

[ohsobad_chevy]

Heat cycle the motor a few times and then ride the piss out of it.

[yamahaman623]

ok because the guy that built my engine said let it idle for 15 min. then ride easy (1 and 2 gear putsy) for 3 15mins cycles. but i heard that if you ride harder it seals the rings better and i just wanted to know.

[gojk]

Originally posted by yamahaman623
ok because the guy that built my engine said let it idle for 15 min. then ride easy (1 and 2 gear putsy) for 3 15mins cycles. but i heard that if you ride harder it seals the rings better and i just wanted to know.

If the cam was replaced during rebuild, do not let it idle.

[coryatver]

Just ride it normal. If it is a before 07 yfz rev the crap out of it.

[d3ktrix]

Originally posted by jersey devil
What is the reason to not let idle with a new cam?

New cams are supposed to be broken in by varying RPM.

[gojk]

Originally posted by jersey devil
What is the reason to not let idle with a new cam?

They will wear incorrectly at breakin causing misshapin lobes.

[Beaudacious]

set the idle about twice wat it is normally and let it sit at that for 15 minutes keep an eye on the temp with a hand held pyrometer if it gets hot have a garden hose handy and spray the tanks on the rad after that drop the rpm gradually till its normal then give it a couple of hard raps of the throttle. then shut it down and immediately drain the oil and change the filter put some new oil in and its ready to be pounded you do this and you wont have a problem

[yamahaman623]

my cams were used so i dont need to break them in. but thanks for the imput and keep posting the info

thanks

[chevys&honda$]

break it in how you are gona ride it, if your gona ride it hard, break it in hard.

[CR500rider]

Originally posted by yamahaman623
my cams were used so i dont need to break them in. but thanks for the imput and keep posting the info

thanks
actually if you bought the cam used from someone else i would go ahead and break them in again because they need to wear into the shims that are on your engine

[zyoung04]

Originally posted by chevys&honda$
break it in how you are gona ride it, if your gona ride it hard, break it in hard.

this is what ive always heard.....i think they done a test a few years back in dirt wheels i cant remember what the quads were im thinkin they were yfz's they rebuilt both done the same mods to both then broke them in one they rode hard the other they just kinda took easy and if i remember right the one the rode hard had more than the one that was rode easy

[blacknblue#2]

Originally posted by zyoung04
this is what ive always heard.....i think they done a test a few years back in dirt wheels i cant remember what the quads were im thinkin they were yfz's they rebuilt both done the same mods to both then broke them in one they rode hard the other they just kinda took easy and if i remember right the one the rode hard had more than the one that was rode easy

I totally agree with these guys on this. I bought a 400EX new in 02. Kept it bone stock but it was WFO from the time it come off the truck. It would run circles around my buddies 400EX that had a pro circuit slip-on and a little jetting work

[honda400ex2003]

it helps to seat the rings better with more compression. I ride mine hard when I rebiult it last summer and it still runs great. I guess I would do it again. steve

[below100hz]

break in secrets (http://www.mototuneusa.com/break_in_secrets.htm)

[chevys&honda$]

Originally posted by below100hz
break in secrets (http://www.mototuneusa.com/break_in_secrets.htm)


Perfect nice find^^^^