Advice sought

[gwynfryn]

I have just rebuilt the top end of my kdx200. New wiseco piston and rings and i pulled the KIPS power valve apart and cleaned everything up.

My question is now what? Is it even important?

Heat cycles?
Ride it like i stole it?
Ride it normally ?
Dont use synthetic oil? etc etc

Everyone seems to have an opinion on seating the rings and obviously i wish to do whats best. So any advice from someone with experience(mechanics/racers) would be appreciated.

I started it on the stand yesterday with my normal 40:1 castrol tts and gently blipping the throttle brought it up to temp(about 4 mins) then shut it down.

Tomorrow i am going riding .

Thanks

[Asher]

I think its best to ride it gently the first few rides and keep it out the power band. The more heat cycles you put it through the more you can push it through the revs.

[Ktmboy]

Couple of heat cycles (15-20min) then they are normallly good to go.

[Pornstar]

I have just rebuilt the top end of my kdx200. New wiseco piston and rings and i pulled the KIPS power valve apart and cleaned everything up.

My question is now what? Is it even important?

Heat cycles?
Ride it like i stole it?
Ride it normally ?
Dont use synthetic oil? etc etc

Everyone seems to have an opinion on seating the rings and obviously i wish to do whats best. So any advice from someone with experience(mechanics/racers) would be appreciated.

I started it on the stand yesterday with my normal 40:1 castrol tts and gently blipping the throttle brought it up to temp(about 4 mins) then shut it down.

Tomorrow i am going riding .

Thanks

Do that again tommorow then go ride it man.

[Crisis management]

What KTMboy & Pornstar said, after half an hour you'll be riding it normally. Whatever you do, don't putter around on it like a nana, you need to work the engine to seat the rings (same for a four stroke) and off road riding with it's variable loads is excellent to bed rings.


Check everything is tight after the first ride.

[gwynfryn]

What KTMboy & Pornstar said, after half an hour you'll be riding it normally. Whatever you do, don't putter around on it like a nana, you need to work the engine to seat the rings (same for a four stroke) and off road riding with it's variable loads is excellent to bed rings.


Check everything is tight after the first ride.

Thanks.
I thought that would be the best approach but wasn't too sure.

[Jay GTI]

Whatever you do, don't putter around on it like a nana, you need to work the engine to seat the rings (same for a four stroke) and off road riding with it's variable loads is excellent to bed rings.

2nd this advice, have heard it from a few engine builders. Basically, it needs a respectful thrashing, i.e. make it work while running in but don't be silly.

[Reckless]

2nd this advice, have heard it from a few engine builders. Basically, it needs a respectful thrashing, i.e. make it work while running in but don't be silly.

Its not a respectable thrashing its pressure on excelleration and decelleration as oppossed to constant revs which glazes the bore and doesnt seat the rings. Exactly the same with a road bike engine.
So its nannering along at a constant 3k that isnt good for it.

The second most imprtant thing is the first oil change after an hour to get rid of any shit that comes off during run in and that got in during the stripdown.

Read this http://www.mototuneusa.com/break_in_secrets.htm its worked for 20 years of 2 stroke kart racing engines for me.

[gwynfryn]

Well i went to the sandpit on friday and rode some technical trails for 30mins. I didn't nana it at all but pretty much stayed off the pipe. Let it cool for an hour then rode hard for two hours. It runs sweet.

Cant see what changing the oil wii achieve though as some have suggested!

[noobi]

Care to explain how changing the oil in a two stroke is going to 'clean' out any of the ring seating residue?

[gwynfryn]

I haven't split the cases or gone near the transmission and it is not a new bike so i still can't figure the need to drain the oil.
I dont mind draining it as i do every couple of rides anyway and atf is relatively cheap, but i would like to know how it could become contaminated with the work i have done.
I must be missing something or you are incorrect.

[Boo]

Nah mate your be right , whats spending $12 worth of ATF, because a bit of fine grit comes off when your bedding the rings in and it drops into the crank and mashes between the the crank and cases , gears, shafts, selector forks or bearings.
You wont feel any thing it'll still rev its guts out without a problem.

[noobi]

The second most imprtant thing is the first oil change after an hour to get rid of any shit that comes off during run in and that got in during the stripdown.

Nah mate your be right , whats spending $12 worth of ATF, because a bit of fine grit comes off when your bedding the rings in and it drops into the crank and mashes between the the crank and cases , gears, shafts, selector forks or bearings.
You wont feel any thing it'll still rev its guts out without a problem.

You guys have funny 2 strokes.

[t595]

Nah mate your be right , whats spending $12 worth of ATF, because a bit of fine grit comes off when your bedding the rings in and it drops into the crank and mashes between the the crank and cases , gears, shafts, selector forks or bearings.
You wont feel any thing it'll still rev its guts out without a problem.

What good is changing the gearbox oil going to do???

[DEATH_INC.]

You guys have funny 2 strokes.

Lol, yeh.
I always used to putt around for about an hour up/down small hills etc, keep 'er off the pipe, not too much throttle and vary the load. No long idling periods either. Then over the next 30 mins or so bring 'er up to full use.