So I purchased my first clone the other day, the KM Baja with the 30.5cc.
Out of the box this thing is amazing. But I made the mistake of not going over everything, especially the air filter..
Lesson learnt.

Just thought I'd share my misfortune.[:'(]

That engine looks pretty damn old...

I just got it less than a week ago..

Did the air filter fall out or something? That motor is dirty on the inside

He didn't oil the air filter. He's posting this as a lesson to everybody that runs nitro and gas to make SURE their air filter is oiled on their new ride before they crank it up.

Sucks dude, happens to the best of us.

Yeah dude you gota be real careful with those things. Gota check everything over. Go hit up DDM for a new motor, get a zenoah 4 bolt. Around 200-275 bucks depending on the displacement. A lot better than the stock motor.

This is why I'm anal about my air filters. I won't even crank the engine if there's no suitable filter attached, let alone start it.

I thought it would have come pre-oiled like all of the
Traxxas's i've owned...guess nott.
Nicely spotted at what i was trying to achieve by the way.

I'm thinking about getting another 30.5cc...Does Zenoah make that displacement
? I only want to spend about $300ish.

yep 378 is right about air filters. one time i for got the air cleaner running on pavment, it ran fine for a long time. but when i stoped the idle was high. checked the carb and there was a pebble stuck on the slide. if that pebble had gone into the engine i would have had trouble.

its trash give it to me

running it in dirt/sand heavy areas?

Ooops,[:@]

The biggest motor Zenoah makes is a 4 bolt 29cc ($275). GET IT. It will be more powerful than that 30.5 cc because over all its a much nicer engine. Make sure you order a couple extra gaskets for the carb for when you change air filters. Drop some extra coin on a new exhaust as well, around 150$ and you will see a huge gain in performance.

Whats this whole "4bolt" and "2bolt" deal?...is it the number of bolts the engine has? [&:]

Number of bolts that hold the head on, isn't it?

The entire cylinder assembly, actually. The cylinder head is cast integral to the cylinder itself on most gasoline two strokes.

Yup. Number of bolts on the head. 4 bolts are much more reliable and stronger.

Never messed with little gas 2 strokes. All the gas 2 strokes ThunderbirdJunkie is familiar with have a separate crankcase and cylinder "jug".

That jug is exactly what I was referring to.

You mean the head and the jug are one piece?

It may just be the old junk ThunderbirdJunkie works on (70s and older two stroke bikes), but the head is normally separate from the jug and the jug is normally separate from the crankcase?

Yes, the head and cylinder are cast as one piece (usually), and generally referred to as a top end. As with a nitro engine, most of the cooling happens above the plug, but gassers dont have a tall head, the cooling find are cast around the sides of the cylinder. Some aftermarket cylinder kits actually have a head with a head button that is detachable from the cylinder, and some have a "wrap around head", which pretty much just extra fins you bolt on top of the cylinder. At the base of the cylinder are the holes which allow you to bolt it to the block, some have two directly across from each other (2), and some have one on each corner (4). The plus side to 4 bolt heads, is that they seal a lot better, and your gaskets are less prone to blowing out.

I really dont understand why all of them aren't 4 bolt, it shouldn't be an upgrade, it should be standard.