Want Input - Initial engine startup

I keep wondering where the "keep it above 2500 RPM came from". The riders manual say to keep it to 1/3 throttle or less and to vary the speed as much as possible for the first 500 miles. Not saying anyone is wrong - just wondering where it came from.

marshg246 said:

I keep wondering where the "keep it above 2500 RPM came from". The riders manual say to keep it to 1/3 throttle or less and to vary the speed as much as possible for the first 500 miles. Not saying anyone is wrong - just wondering where it came from.

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It's simply to keep oil on the cam/followers as they are fed by splash

marshg246 said:

I keep wondering where the "keep it above 2500 RPM came from". The riders manual say to keep it to 1/3 throttle or less and to vary the speed as much as possible for the first 500 miles. Not saying anyone is wrong - just wondering where it came from.

Click to expand...

Hi,

I think you are mixing up running on the bench & running on the road. When running on the road you are correct, no loading the motor, keep things spinning & use the gears.

I've never done this but I've read on this forum & others that if you run the bike on the bench for the first time you should keep the engine running & keep it around 2-2.5K for up to 20mins. Not my idea of fun!!! This is to allow the new cam & followers to mate & bed-in ensuring a good amount of oil flow over both. You would need to supply a good amount of moving air to the engine to keep the it from overheating & wear decent ear protectors & have a large rubber mat under the centre stand!!!!

Any thing under 2500 RPMs and you be labouring the motor, not good for any new motor even old motors and don't sit on the same revs vary the revs and get the first 100 mile up as soon as possible, I also run my rings in at night time when its cooler as well use cheap oil to bed the rings in.

Ashley

I know I'm gonna get slaughtered for this but I don't run a bike in at all
I just take it out and ride it I'd never sit there reving the bike in the garage
As long as the bike is halfway tuned statically it'll be close enough I don't labour it but if I feel like caning it that's what I'll do I don't worry about what revs I give it
You can feel when an engine isn't happy
If your rebore is done correctly and you don't overheat the engine then all will be well
This just my two pence worth
Cheers

baz said:

It's simply to keep oil on the cam/followers as they are fed by splash

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I've also heard that, but what about the oil returning from the rockers? Also, a crank spinning at even 1000 RPM will be flinging oil towards the cam quit a bit! I'm sure spinning at 2500 RPM throws more but then it needs more at that speed.

I coat everything with zinc-bearing assembly lube when building and then follow the riders manual. In fact, I let air cooled motorcycle engines idle or sit stationary while running as little as possible.