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I noticed that in one area of the reference it states that the correct engine oil is 5W-30 and in another place it says 10W-30, everything else I have seen or heard on this subject has point to a quality NON Full Synthetic 10W-40 or 15W-40, I've been running Valvoline MAX Life 10W-40 Semi-Synthetic, I'm just a little cutios as to why the Full Synthetics are not Recommended for these engines, is it that the oil pumps in these engine is not strong enough to move the much stickier Synthetic oils? this is the only thing Ican come up with that might pose an issue for these engines if the pumps in them just dont produce enough pressure to move the synthetic oils like it will the much more fluid conventional oils, I run a mixter of standard Castrol HD30w & 5w-20 Royal Purple Full Synthetic in my High output GX200 Honda Clone, the reason being that I cooked a couple of Connecting Rods trying to run full Synthetic in it because the stickier oil would not flow between the Rod & Crankshaft under the force of the rod dipper scooping up the oil, the synthetics are much better lubricants than conventional oils but they seem to require a good pressurized oiling system or they will starve the components of lubrication and we all know what comes next.........screach............!!!!!!!!!

Anyway if some of you gentlemen know more about all this than I, please ring in here and explain the reason for the NON synthetic Recommendation on these GY6 engines.

I'm gonna start a new thread asking "what oil do you run in your scooter and why?"

Thanks & God Bless all
Shan

Scooter depot has the 150cc scoots for $807.00 - $907.00 shipped right to his door, with great warranty and life time customer service, many of the ones they have listed that start with the MC_***** example MC_K75 are Roketa scooters, all the common GY6 parts work, thats what I have and they are very standard with the most popular parts.

V-Twin clean, simple and a classic

Thats Great maybe there is soem info. there that will help someone in the rejetting proccess.

Anytime I remember something or find something that I think may be helpful I'm gonna post it and hope that someone will benefit from it.

Shan

I know what you mean.....LOL

I pass dead animals on the road to and from town all the time, Skunks, Armadillos, Deer, Racoons, Rabbits, Snakes with the occasional Cat or Dog, in the 120+ degree in the sun Texas Heat they get ripe real quick, and I have to dodge them many times on my way to work early in the mornings at 5:10 - 5:30AM, I sure am in no hurry to hit one of them raskels dead or alive.... that may end up putting me on the road right beside them, not fun at all...!

Thanks for the input everyone, My question on this was answered.

So I will just focus on getting more air and fuel through the original carb after I modify my exhaust, all the porting and port matching is very farmiliar to me, done it to many small engines like the GX200 Hondas and old Briggs 5HP engines, I have a GX200 that I built a couple of years ago I believe is putting out around 12HP, done a bunch of mods to it, including custom Billet Rod, long slot rockers, chromemolly push rods, High Compression Head, piston, rejetted and tuned carb., custom exhaust, filed flywheel key to give 6 degrees timing advance, Noram racing clutch, and other small tweaks here and there, so I do have some experience in the Modification of small engines, but these GY6 motors are completely new to me and I would much rather learn from you guys who have "been there done that" rather than me just trying a bunch of stuff and having to redo things that you fellows can give me great direction on before I ever turn a wrench on the thing.

I'm not on a quest for more speed above the 60-65mph flat out range, I just want to be able to loose a little less speed on the slight upgrades I travel to and from work, and have it also pull against a head wind a little better, I'm sure this is the quest of most of the people on here that are doing any upgrades to these scooters, I'm not ready to dive into the head, jug, and internal changes yet, I want to get all I can out of what I have to work with in those areas to see if I even really have a need to go any farther with my engine, it seems to me that instead of dumping loads of time and cash into the 150cc one could just upgrade to the 250cc scooter and fill all those gaps and have a little fancier machine at the same time, but I am one that would love to have a 150cc scooter at some point that would almost do what the 250cc will do just for the fun and adventure of getting it to that point.

Well, dang-it I got long winded again, just cant shut up sometime....Thanks you all very much!
Shan