Motorcycle engine break in procedure. - PeachParts Mercedes-Benz Forum

GTStinger · #1 09-22-2009, 05:09 PM

Anybody ever heard of an engine break in process like this?

Guy I work with bought a Husqvarna dirt bike. Motor seized solid after 2 months. The dealer refused to replace it since he didn't follow the manufacturers motor break in procedure.

Run motor 1 hour.
Change oil.
Run motor 2 hours.
Change oil.
Run motor 4 hours.
Change oil.
Run motor 7 hours.
Change oil.

Four oil changes in 14 hours of operation.
They claimed it's in the owners manual. Must be in the 95% thats written in Italian. (not a joke, only a few pages are in English)

I know they are just trying to avoid a claim, but thought their procedure was outlandish enough to be of interest.

Gurkha · #2 09-23-2009, 12:49 AM

The engine seized not due to the oil but due to the poor machining of the cylinder. Now they are trying to cop out of it. On my Yamaha or Honda, even the 2 stokes, first oil change is at 1500 miles, thats all.

Matt L · #3 09-23-2009, 12:53 AM

Quote:

Originally Posted by Gurkha

The engine seized not due to the oil but due to the poor machining of the cylinder. Now they are trying to cop out of it. On my Yamaha or Honda, even the 2 stokes, first oil change is at 1500 miles, thats all.

Oil change on the 2 stroke? Hmm... Does refueling count?

Nate · #4 09-23-2009, 01:01 AM

Busted

Gurkha · #5 09-23-2009, 01:02 AM

Quote:

Originally Posted by Matt L

Oil change on the 2 stroke? Hmm... Does refueling count?

You mean to tell me the gears on 2 strokes run on some miracle compound or do you mean to say they are meant to run dry.

Gurkha · #6 09-23-2009, 01:03 AM

Quote:

Originally Posted by Nate

Busted

And you run a Honda Shadow, I guess you have never had chance to own 2 strokes the likes of Yamaha RD350B and others.

Medmech · #7 09-23-2009, 06:47 AM

Quote:

Originally Posted by Gurkha

You mean to tell me the gears on 2 strokes run on some miracle compound or do you mean to say they are meant to run dry.

Explain to the class about how and where you change the oil on a 2-stroke ENGINE.

Gurkha · #8 09-23-2009, 07:16 AM

Quote:

Originally Posted by Medmech

Explain to the class about how and where you change the oil on a 2-stroke ENGINE.

Explain to me where I mentioned oil change for ENGINE in 2 stroke, my statement was meant as a general reference to the OIC for new motorbikes. Next time I shall be more specific Effendi. Four strokes get oil changed for their ENGINE, 2 strokes get oil changed for their trannies.

Medmech · #9 09-23-2009, 08:58 AM

Quote:

Originally Posted by Gurkha

Explain to me where I mentioned oil change for ENGINE in 2 stroke, my statement was meant as a general reference to the OIC for new motorbikes. Next time I shall be more specific Effendi. Four strokes get oil changed for their ENGINE, 2 strokes get oil changed for their trannies.

Quote:

Originally Posted by Gurkha

The engine seized not due to the oil but due to the poor machining of the cylinder. Now they are trying to cop out of it. On my Yamaha or Honda, even the 2 stokes, first oil change is at 1500 miles, thats all.

Its much easier to say "Typo my bad"

Gurkha · #10 09-23-2009, 09:08 AM

Quote:

Originally Posted by Medmech

Its much easier to say "Typo my bad"

No typo there, paid the price for not being specific, should have meant engine for 4 stroke and tranny for 2, was just too lazy, was late night.

Medmech · #11 09-23-2009, 09:35 AM

Quote:

Originally Posted by Gurkha

No typo there, paid the price for not being specific, should have meant engine for 4 stroke and tranny for 2, was just too lazy, was late night.

That is a perfectly acceptable answer.

Rob Pruijt · #12 09-23-2009, 10:26 AM

Husqvarna bikes are very high performance racing bikes.

The break in is not because of poor machining of the cilinder (cilinder is not affected by breakin in, just pistons and rings), but of the very small tolerances.
These tolerances will allow for a couple af HP extra wich may be the difference btween winning and loosing a race.

The inside of the cylinder there is honed, so the oil sticks to it. If the tolerances are very small, the debris for breaking in the piston and rings fills up the hone. Te result is that the piston makes direct contact with ten cylinder wall and starts to oscillate. Just before an engine seizes you can hear a very high pitch noise from this oscillating. The same happens if the engine and oil overheats.

If you are able to stop the engine when this noise starts you will see a very shiny spot on the piston. If you sand it off and rehone the cylinder the engine will be ok.

Breaking in a high performance air-cooled engine is not easy, the engine should always be at operating temperature and lateral piston pressure should be raised very gently and oil frequently changed.

On their website they state” ATTENTION! The validity of the warranty is strictly related to the respect of the scheduled maintenance plan.”, so if you co worker did not follow is his claim makes little chance.

If he is into serious racing he will have to replace the cylinder piston and rings and start over.
If he uses it for recreation he is better of with a less sophisticated or more worn bike.

Rob