Hi All, hoping you can shed some light on this for me. I'm nearing the completion of the engine rebuild on my mk2, all back in the frame and the last few bits to put back together.
Last night I plumbed in the oil pump and bled it as per the manual. The rebuild doc I've been using suggests you should also make sure the two pipes are also filled with oil though. I removed the output pipe and kicked the bike over a few times with the throttle both open and closed expecting to see oil come out of the output hole but there was nothing. Is this usual ? and do I just fill the pipe (the one going to the inlet) with oil and forget about it ?

Cheers

Ed

Hi Ed,

Have just completed rebuilding my Mk1 after it spat the main bearings out at me!!! So can relate to this.

Had the same problem, but wasn't sure whether the oil pump was working or not.

Rather than the risk blowing of it up again i drained the fuel tank and then refilled with a little petrol/2stroke mix (as in pre-mix) This ensured that the new bearings would receive some oil and i could also check the pump was working.

I also replaced the inlet pipe for a clear one so i could actually see oil going through

It would seem that the oil pump requires a huge amount of revolutions before you see anything coming through. You would be there forever if you were just kickstarting it over and waiting for a sign.

Hope this helps.

SMB

Ed years ago i had X7 which had oil pump problem(i thought), daft as i was i removed the pipe from the inlet and fired the bike up and to my surprise there was about one drop every 5-10 secs with the engine ticking over so i would say that you would have to kick a few times to get any oil out of it say for 10-15 mins .

The other thing is to run a tank of premix as your first tank full with the pipe removed and see what comes out then.

Try removing the pipe from pump to inlet at the pump end and kick it.

Not 100% certain how these pumps feed been as the pump is pushing and the inlet is sucking.

Hope it helps

Lee

thanks guys - sounds like there probably isn't much wrong then, I just need to do a premix for the 1st tank (30-1 ??) and disconnect the output with engine running to confirm there is oil coming through ? Suppose this would also be why the doc says to make sure pipe is filled - every 15 secs would take ages to fill the pipe before it even starts to drip out the end...

Hey,

When I rebuilt mine I simply bled to the fuel pump and put a small bit in with the fuel with no problem.

I wouldnt go sucking on pipes like that because they arent designed to operate in that manner and you could inadvertently damage a seal.

You will be ok with some in the fuel.

B.

yeah - going to premix 1/2 a tank or so I think - what ratio should I go for ?

good tip - before I connected up the output pipe I filled a syringe with oil and injected it from the (disconnected) pump end until it just came out of the carb end, then removed the syringe and immediately connected it to the pump. That way the pump is not spending th first few mins filling the pipe before it gets into the system.

Hiya,

I cant recommend a ratio as such, just make sure there is some in there - use some common sense

bummer - i'm doomed...... common sense sorely lacking

lol

Bargos wrote:Hiya,

I cant recommend a ratio as such, just make sure there is some in there - use some common sense

Jesus Chr**t Bargos......that's some of the worst advice I've ever heared . Talk about the blind leading the blind.
500 plus posts too.

Edarter.......getting the ratio correct for pre-mix is critical. Go for 30:1 until you're convinced the autolube is working correctly.
It's absolutely not OK to just put some in.

Andy.

Hi

I'd second the premix option for first run, I've just restored my mk2 not an engine rebuild but I did strip and clean most things so the oil injection had been drained.

I think I'd just use the manufacturers recommended mix for the make of oil you are using. There is a simple calculator here
http://www.speed-sports.com/Go-Peds/AM_ ... oCALC.html

Even the cheapest oils will mix 30:1, some expensive ones will go all the way to 80:1 but I wouldn't use this type in a CRM oil injection. I'm not sure what the pump ratio is but I expect its somewhere between 30 and 50:1, obviously it will change ratio as the rpm changes too and dependant on the throttle position.

I found that calculator quite good as it will calculate mixes for small amounts of fuel you'll only need a couple of litres to get the bike running and run it for long enough to do some shakedowns. Obviously you'll experience lots of smoke once the oil injection kicks in.

Its a good thing to ensure that a freshly rebuilt motor has plenty of lubrication tho.

As you will see from some of my other posts I got quite concerned about the smoke, it took ages to clear I even got to thinking I'd killed a crank seal and it was running on gear oil. Even after draining out the premix fuel and draining the carb I still got smoke until I'd ridden for a good ten mins.

Toad

Andy,

Read Ed's post again - he already said that he is pre-filling the output from the oil pump - the fuel only needs a drop of oil to lubricate for the first few seconds of startup until it moves from the pre-filled pipe into the engine. Running 30-1 premix as well as the correct output from the oil pump means that his engine will receive twice as much as normally required - if you think this is good for the engine then please explain why Honda dont do it?

Obviously if he was running premix only then he would need to get the ratio spot -on. If you read his earlier post he already stated what the correct ratio is - I assumed that he didnt need telling again.

B.

Bargos, You're not making sense.
The engine will be fine on premix and autolube oil at the same time. It is common practice when priming oil pumps both in the motorcycle and the outboard motor industry.
The engine will be fine, if a little smokey and a little lumpier on tickover.
Running with an unknown premix ratio, when you're not sure if the autolube is working, is suicidal.
Just \"putting some in\" is not good enough Bargos, and anyone who understands 2 stroke's will confirm that.
I had to step in before Ed damaged his engine.
I'm sorry Bargos, but I'm fully up to speed with this thread and regardless of how much oil Ed has introduced into the autolube pipework, he would be well advised to use premix too. And if you're premixing to save your engine while you verify correct oil pump operation, its got to be a mixed to the right ratio or it's pointless.

Andy.

Blimey guys...didn't mean to start a 'virtual fight' thanks for all the info though. I will be going very careful.

I have another problem now though - seemed like a good idea to repaint the exhaust system before fittign it - can't get the finish right on it though so I'm having to wait for a mate to have some time to spray it with satin high temp paint (halfords only do matt as a spray)

Ed, no problem - you didnt start it!