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My engine would seize quick if the oil pump wasn't working correctly right? Never took this side apart before. What moving parts could break this aluminum apart on that side? If the oil pumps sprocket or gear is plastic then that scares me more.



These are not shots of my engine but this is of my style correct? Also curious about oil Temps should range from? I have a oil catch hooked to my dipstick port and could pull readings from it to check. I've seen oil coolers or coils/radiators that some instances people install. I just want as less stress on the motor as possible since this 39-52mm upgrade you know.. Thanks again for your time. Your answers and helped with guidance is very much appreciated.

So now I'm more satisfied after reading all this and will be leaving the carb and jet as it is but still wish the rpms would be in a much safer range. So I'll just get heavier rollers or sliders? I bought and used sliders 4yrs ago in my old Tao Tao 50cc VIP but wasn't as impressive as the talk I heard of them. Now I'm not going to settle unless I figure out what and where these chips have came from and to make sure this isn't a current issue with any of the new or previous parts that still remains. If it's not the cylinder, rocker arms, valves, block, piston, cam, or a flange of some sort, what else could it be? A part of the crank? Crank bearings? Idk like I said I bought this used and it's a 2011 scooter with 2 owners and had 2300kms or 1,750miles aprox. Maybe it had something go wrong awhile back and these pieces are just residual from a busted piston or cylinder head. Not sure but I don't like it. I almost want to take everything back apart or at least get to the well that holds the majority of our engine oil.

The speedometer always seems off on these scooters so I used a GPS. The pieces were in the gully of the oil cap that was past or Below the oil screen/filter. That made it pretty obvious it has been there somehow before the last oil change or else how could it get past the filter since it's intact and sealed with a rubber grommet that's around the screen. There was also pieces that came out with this old oil when drained. The aluminum chips seem to have markings on them that almost looks like threads but is not, more like vertical or horizontal scratches. Very strange. I'll post a zoom in image.

I appreciate you responding and please bare with me because I can be all over the place at times. My rollers I pulled out were 4.6g(5g)which I first thought was 7g and I installed 9g. This had help bring the rpms around 1k. The jet in the original 18mm carb is a .87 now from .79 stock, not sure if that's about as big as these should take or recommended..? We have laws around where I live for scooters "49cc &under". That's why I'm tinkering with this one instead of just going up to 150cc and not having to make all these mods. The head cylinder still is one marked with a 49cc stamp. Not sure how stiff these laws are enforced. Anyways this is the dimensions of the new carb I was going to install.
Inner Diameter (intake side): 25mm
Outer Diameter (intake side): 32mm
Inner Diameter (air filter side): 38mm
Outer Diameter(air filter side): 42m

And the Intake Manifold

Bolt hole spacing 45mm
Inner Diameter (carb side):33mm
Inner Diameter (engine side):27mm

Ordered intake spacers I will bore to adapt if it's necessary.

Air Filter
Inside Diameter 42m

So the carb is actually 25mm not 24mm.... Will this carb be too too much over kill? Should I had just went with 20mm or 23mm I guess?
Also I noticed a huge possible past issue when I did it's oil change today. 2 chips were in the oil cap Below the oil screen and spring. Once I noticed that after I drained the remaining I noticed a few more that came out. I know I'm thinking oh crap! Well after inspection of the old cylinder head, valves, rocker arms, piston and it's block and cam I didn't see ANYTHING that it could have came from. This definitely happened prior to the last oil change whenever that was and had to be either from the stroker it's self or from a previous part that's been replaced already. It's aluminum and I'll try to post a few pictures here. This could be problematic if more residential pieces or shavinngs are still in there. I tried kicking the crank to see if any more oil will come out but had nothing. I'll drain the new oil again to check in a few days. I figured if somethings wrong or chipped it wouldn't run as good as it has since I replaced everything. Also my intake and exhaust valves were adjusted to .005". I read you recommend .003 & .004? Is the stroker milled aluminum or a iron casting? My rpms at idle is around 1,700 warm 1,900 cold. Still reaching 9000-9500rpms around 35-45mph. Also another question is that I still have the original style CDI which I thought sets or limits #RPM's?