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An issue with the valves was my guess as well, what made me think this is when you said that it only revs to 6000 RPM's with the rear wheel off the ground, if it were an issue with the variator or clutch it would still hit 8000+ RPM's easy with the rear wheel off the ground.

I went through a simular issue one time on a 50cc scoot that belong to one of my brothers, power just kept falling off until finally it wouldn't even start & run, I adjusted the valves and it started right up and ran like new, it had almost 3000 miles on it when all this started happening to it, I'm surprised it lasted that long because the valves had never been touched on it.

Anyway, set those valves and good luck.....hope it runs like a champ when you're done.

I also have a 2008 MC-74-150, great scoot! just set the valves on mine last week and it pulls better and revs better on the road now, mine has 2100+ miles on it now.

Peace, map

Hey no problem at all sprocket, I figured you had fuel additive on your mind.....

As to the fog........if I didn't have a bit of that everyday I would think something was wrong....LOL!

Peace, Shan

Finally recieved my order from monsterGY6.com today I ordered the stuff back on the 10th of July and not only did it take way long getting here but I didn't get what I ordered in reguards to the rollers I paid for.

I ordered a set of the NCY brand 12g. rollers which I got.

I ordered a set of the NCY brand 13g rollers which I didn't get.

Instead I got Prima Brand rollers which look to be the ones they sell for $11.50 but I was charged $16.00 for the set as if they were the NCY brand rollers.

www.monstergy6.com/product_rollers.htm

I ordered a UNI Filter which I got and a #120 jet which I got.

I called 3 days ago to see why I hadn't got my order yet and was told it had taken so long because they had been on vacation..........but my order would be shipped out that same day that I called, it seems that it was shipped as I was told but I didn't get what I paid for.

I'm very disapointed in what they seemed to have done by substituting a product and charging me for what I actually ordered.

NOW.............If I am wrong about the Prima brand rollers being a cheaper lower quality product please someone correct me, but they look to me just like the standard black rollers that they list on their web site for $11.50, the finish on the rollers is dull and a bit rough, not at all like the finish on the NCY rollers..........., the reason I ordered the 12g & the 13g is because I wanted to have a total weight of 12.5g in my variator and I wanted matching rollers not 2 different kind with one being inferier to the other.

First time I give monsterGY6 some business I get crapped on or so it seems.

Sorry to rant a bit here but almost 2 freaking weeks and then I don't get what I ordered......!

incuded here is a pic of what I got.

Peace, Shan

I have a 150cc scoot and I run for many mile WOT all the time, mine has over 2030 miles ( 3267kms )on it now.

My suggestion is that you be using a very high grade 4 stroke Motorcycle 4T oil designed for air cooled engines, I am using an oil made by Lucas in mine now but there are many others that are good as well, Castrol, Amsoil, Valvoline, Yamaha and other major motorcycle makers in a 10w-30 or 10w-40 grade.

The oil is the life blood of these little high reving engines so it is very important that it be of a very high quality and changed fairly regular to keep the protecting from the heat & pressures of the high RPM's at its optimal level, alsio make sure to check your valves settings here pretty soon if you haven't already, that is another critical point that needs to be kept right on these little screamers.

I wish you and that scoot long life......Peace

Shan

I agree completely on your take of the oils.

I also think that using the rare earth magnets on the spring is a great idea..... I'll be doing that one myself next time I change my oil... Thanks

And as to the oil pump, I've read several post by others that have said that the pumps in these engines are a bit weak in the knees so to speak and might have a hard time moving the heavier oil in a high enough volume to lube the engine like it needs to be.

I use a PTFE additive along with the high grade oil, it isn't all that expensive about $5 for an 8oz bottle but it sure is some slick stuff and in a high heat high pressure enviroment the slicker the better...., I use about 2 table spoons of it at every oil change, this stuff has so much Teflon in it that it is milky, it's in a base that is claimed to have other good additives for dealing with the high heat & high pressures.

It's called Greased Lightning Instant Engine Treatment and I use it in all of my air cooled 4 stroke engines and have been for a long time, I believe that it really does make a difference in reducing wear.

If you have access to some get soem of it and you'll see what I mean when you pour some out and/or get some of it on your finger, the stuff is extremely slick......

Peace, Shan

This is what I'm running now.....


www.lucasoil.com/products/display_products.sd?iid=288&catid=16&loc=show&headTitle= - High Performance Synthetic 4T MC Oil w/ MOLY

Peace

I have my scoot insured through Allstate $6.30 per month = $75.60 per year.

Peace, Shan