Topic: Bogging when gassing hard

[Coredozer19]

Oil pressure is from the pump not the rings? Unless you mean release of pressure from blow by?

And the biggest thing....I don’t have a title yet. I’m having trouble getting ahold of it. So I can’t really ride it.

I should have the title and registration figured out in a few weeks. I’ll refrain from starting it until then.

[DaveBarbier]

Low oil pressure from letting it idle and the pump not spinning that fast and on a new motor you want good oil pressure. I know you’ve been using the throttle but when you say “heat cycles” I imagine you’re not sitting there revving the motor constantly for 15 minutes. I imagine you letting it idle.

I assume you’ve done the research but there is the “Vermont route” in getting titles. If you’re unfamiliar, do a search. Also, in CT I don’t need a title, I assume Pennsylvania does need one but just want to be sure you’re not chasing something that’s not actually necessary.

[TwoTired]

Have you considered how the cylinder walls get oiled?
They get splashed with oil from the spinning crank rod journals.  And the splash volume is related to oil pressure...which is lowest at idle.

Further, new rings need combustion pressure seeping past the pistons to get behind the rings and push them out toward the cylinder wall.  The highest pressure is when the engine is under load and making power.

You don't properly break in an engine top end job at idle and low cylinder head temps.  You need proper operating temp so that the parts will expand and "marry" at the temperature it is to be operated the most, cruising/accelerating with air movement over the engine for cooling.

Cheers,

[PeWe]

About break-in.... do not drive like a coward, just crank it with heavy decelerations (throttle off). Most important in the very beginning.
http://www.mototuneusa.com/break_in_secrets.htm

I can confirm the result
I have an old setup of 836 pistons that got a soft break-in the first 1000 km.  Brownish under the rings, not burning oil
They are not as shiny as the 836 pistons my bike got after I have read that site. No brown area under the rings despite rather roomy piston/bore clearance

[Yamahawk]

About break-in.... do not drive like a coward, just crank it with heavy decelerations (throttle off). Most important in the very beginning.
http://www.mototuneusa.com/break_in_secrets.htm

I can confirm the result
I have an old setup of 836 pistons that got a soft break-in the first 1000 km.  Brownish under the rings, not burning oil
They are not as shiny as the 836 pistons my bike got after I have read that site. No brown area under the rings despite rather roomy piston/bore clearance

There you go! And don't cruise at a steady RPM for the first few hundred miles, always vary the RPM's by using your gears. The only time I heat cycle a newly rebuilt engine, is if it is a 2 stroke, then you want to cycle the engine for a few times to heat it up and get the oil/gas mixture in there and start the break-in. THEN you wail like a Banshee on it to break in the cylinder(s) and rings, hehe... Rings seat under load, as has been stated, not at idle.
Charlie