Break in question

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LC Cnd
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Break in question

#1 Post by LC Cnd » Sun Sep 11, 2016 9:35 pm

Up to 300 Kms into it. Using 220 mains and 27.5 pilots at sea level. Power band is kicking at 6000 rpms and reving it occationally to 7000. Idles at 1200 and the air screws are turned out to spec. 94 + Ipone premixed 32:1 in the tank. What kinda sucks is I have yet to feel the front end pop up or lighten. Suspect its too early for the rings to seat in - perhaps.

Bare
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Re: Break in question

#2 Post by Bare » Mon Sep 12, 2016 12:48 am

Naww Not too early The thing should be willing to rev up quite nicely by Now. Wouldn't hurt to occaisionally Zing it up to 9k or so at this point.
Heat and lugging it are the Enemy not neccesarily RPMs.
Some bikes wheelie easily others don't.
Old Aircooled RD's did it 'too' easily .. drop of a hat easily.
Short wheel base and Fat guy rider sitting too far back from the Centre of Gravity does it every time.
Hp has much less to do with it.

LC Cnd
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Re: Break in question

#3 Post by LC Cnd » Wed Sep 14, 2016 8:02 pm

Being rotund is not the issue. Decided to pull the air filter out of the air box to see if could make a diff - didn't. Actually this action cause a problem of over rev'ing like it had an air leak - weird. Place the filter back in. Will fire it up later to see if I get a repeat preformance - hope fully not. Reminds me of the neutral red lining issue which I was free of has returned. Odd.

Bare
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Re: Break in question

#4 Post by Bare » Wed Sep 14, 2016 11:34 pm

Not so odd.
Removing the Air filter leaned out the mixture..

LC Cnd
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Re: Break in question

#5 Post by LC Cnd » Thu Sep 15, 2016 2:54 am

What is odd is the idle is stuck at 3500 rpm now that I have put the foam filter back in. Must have created an air leak some how messing about.

Bare
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Re: Break in question

#6 Post by Bare » Thu Sep 15, 2016 11:13 pm

Whatever ? you are doing to the Pore thing.. It seems consistent.

LC Cnd
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Re: Break in question

#7 Post by LC Cnd » Fri Sep 16, 2016 5:34 pm

That's the mystery & frustration. Ck'd the plugs - black which is no mystery since I'm running the pre-mix rich during the break in. Read on the RD Crazy form that using Microns I should move up two sizes from standard jetting. I will deal with that once the over rev'ing is solved.

seahorse
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Re: Break in question

#8 Post by seahorse » Mon Sep 26, 2016 9:11 pm

I'd be coming up on the mains to a 240, and at 27.5 your pilot is to big that's why it's hanging up standard is 22.5.
Suggest you need to spend as much time on the carbs as you have on trying to kill the thing.
Know the carbs inside out and balance them to perfection and your world will change forever.
81 RD 250 LC Hybrid .Widened frame with Aprilia RS250 Back end & Front end, strokd RZ 421, Kennys TSA's, 31KVM26SS Carbs M-360 P-25 ALBA Ndl Pos 3, Air 1.3/4
81Rd350lc resto 2016
81 Rd250lc resto 2017
1999 ZRX 1100

Bare
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Re: Break in question

#9 Post by Bare » Mon Sep 26, 2016 11:53 pm

LC Cnd wrote:That's the mystery & frustration. Ck'd the plugs - black which is no mystery since I'm running the pre-mix rich during the break in. Read on the RD Crazy form that using Microns I should move up two sizes from standard jetting. I will deal with that once the over rev'ing is solved.

In MY experiences with fitting Microns (short bean can style) there is NO need to increase jettings.
Fit Exact OEM jettings. Then decide :-)
Assuming of course that ..ALL.. else is healthy, working as intended by Yama San
But Hey.. it's Your bike.. you can fit whatever.
As some consolation I can only assume (from a distance) that the possible reasons for your revving issue are;
Sticky slides, sticky cables, clapped out carbs... Air leak(s) ?

LC Cnd
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Re: Break in question

#10 Post by LC Cnd » Thu Nov 10, 2016 10:58 pm

It was an air leak at the jug(s) intake. Bump up the main jets to 240's. Spoke to a gent, with 60,000 km's experience on RD's, and he was of the opinion that the current thought is to 4 break in in is to ride like you stole it as the heat/cooling will temper the rings to move with less fiction passed the break in period; hence faster step up to the power band. Interesting theory. Now this is antidotal, but I spoke to local two banshee owners who did different break in patterns on rebuild (RZ essentially) motors. One rode his hard from day one: the other followed by the book break in. Out come? They (being riding buds) decided to drag race each other following the break in period. They discovered the hard breaking produced a quicker launch off the line. However, 1/2 way through the drag, the by the book banshee caught up and narrowly beat the other. The banchee buds switched rides, for further drags, and the results were repeated. Both riders are also trails riders. Interesting result.

hondaror
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Re: Break in question

#11 Post by hondaror » Fri Nov 11, 2016 8:40 am

I think you are running too rich on the mains. Find a shop with a dyno. Dynos are the BS extractors.

Break in should be a couple of heat cycles, 3. Then riding for about 1/2 tank of gas at up to 3/4 throttle. Then get at her.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

LC Cnd
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Re: Break in question

#12 Post by LC Cnd » Fri Nov 11, 2016 11:55 am

Vancouver Is. is not a mecca for dyno's but I'd be interested in that fact finding mission. Appreciate your insight re the mains. Used that carb sync yet Rory? Think I'll go after carb needle adjustment next - seems to bog out after half throttle. I'm aware the bike gets scary after that - haven't felt it, but look fwd to it. Well, gotta get ready for Rememberence Day - so, to all the men and woman who dawned on a uniform representing our armed forces, whether during war or peace - thank-you for your service.

evan_calgary
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Re: Break in question

#13 Post by evan_calgary » Fri Nov 11, 2016 4:06 pm

Yes, opinions on break in are varied. I prefer the fast and hard approach. One thing both agree on is not to maintain sustained RPM for long periods.

Adding aftermarket pipes and running stock main jetting is asking for a seizure. You may end up there but you are correct to start richer.

If the bike will not rev, you have gone too rich.

Based on your high idle, you are likely also too rich on your pilots.

Not sure why your pilots are 2 sizes larger than stock. That is not a good starting point.

If the bike will not run and rev at this point you would be wasting your money on a dyno session. You should be getting close before going that route.

Buy some jets and do some testing. This is the only way to figure it out. Its not fun but at least its only 2 carbs and easy to get at...

hondaror
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Re: Break in question

#14 Post by hondaror » Sun Nov 13, 2016 10:25 pm

The whole point of the dyno session is to get the jetting right. Stock jetting is so rich it's safe with pipes. Trust me on this one. Steve and I have both run our bikes on the dyno and the 2nd run after assessing the jetting yielded great results. You should not have to ever change the pilots on stock carbs.

I just finished sheeting my garage. Hoping to start on the bikes this winter.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

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