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June 13th, 2014, 05:53 AM   #11
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I Ride: FE 450 E/SM '04
Ok. Thanks.
Do you know or you can check if the jet squirts upright or at an angle (to the center of the piston)?
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June 13th, 2014, 04:40 PM   #12
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sure ill take some pics for you 550 and 650 cases you'll have to guess what to do with the 450.
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June 13th, 2014, 08:33 PM   #13
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Drilling piston squirter

the jet hole is 1mm diam and points straight at the center of the top of the bore

the bigger hole on the 650 is the one i drilled to lube the main bearing

02 650









06 550






if you remove the plug to the oil gallery from the outside front of the case and put a rod in there it will help visualize where the hole is

Last edited by bushmechanic; June 13th, 2014 at 08:36 PM.
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June 14th, 2014, 12:34 AM   #14
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I see this little hole (0,5mm maybe 0,6mm) in my case.
So I can use them as pilot hole for my drill?
The length of this hole to the oil gallery is 5mm. It's very short.
What length of the thread has oil jet?

AND
If I have oil hole in my case which gives some oil "squirt" to the top of piston, what is the meaning to mounting oil jet with this same size?
Is this oil jet gives a conical shape of squirt or longer stream?

PS.
Ok. I think that little hole just gives oil droplets that flow down to the balancer. Therefore milled material from the hole.


Last edited by hacker33; June 14th, 2014 at 12:57 AM.
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June 14th, 2014, 04:32 PM   #15
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Thats a factory drilled piston squirter like in my 02 650

so you don't need to do anything maybe just drill it out to 1mm

or if you want to add a removable jet to make it easier to clean then it is the same as the std #100 pilot air jet in the kehien carb (1mm hole)

I cant remember the thread pitch or diam but it is very short
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June 17th, 2014, 04:08 PM   #16
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stock pump bore model



boring 2mm deeper breaks into the intake and exit passages so I rotated the grooves CCW

important part is that there is 10.2 -10.5mm of the bottom surface without any holes, so the oil pump can trap oil and push it over to the pressure side

desired shapes after machining, i made the grooves 4mm deep instead of 2mm , bit like porting.



12 year old camera is being difficult, pics of real bits soon.
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July 19th, 2014, 04:51 PM   #17
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did some surgery on the old camera, getting on a bit but its a good unit. ..

finished oil pump cavity



new pin hole 3mm higher up


Last edited by bushmechanic; July 19th, 2014 at 05:58 PM.
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July 19th, 2014, 04:55 PM   #18
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increase oil pressure 02 650

the oil pressure relief valve is between the cases



late model oil pressure relief spring top, 02 below



OEM spring in this engine is providing 450gm force

found one that gives me 2-3 lbs should be 30-35psi on the 8mm hole



i'll test the oil pressure before it all goes together properly since it requires case split to get to.

Last edited by bushmechanic; July 19th, 2014 at 11:18 PM.
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July 23rd, 2014, 01:38 AM   #19
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testing the cracking pressure of the valve



put the oil pump cover on and used compressed air

OEM was 13-15 psi, i have it set at 35 psi, a bit over 3 lbs force from the spring is about right
Thanks from spanner
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September 16th, 2014, 07:20 PM   #20
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I tested the running oil pressure today it measures only 20psi with the 3lbs load on the spring

with the cracking pressure set at 35psi I was expecting running pressure to be around 30psi, must be more oil going into the engine than I thought.

I will try 4lbs next time.

main advantage of the wider pump is the pressure is 20 psi even at idle .. low rpms etc
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