Head Hunter

[thxcuz]

To paraphrase The Cramps "I'm just a mean head hunter looking for a head"

First, some background for those of you who haven't heard my tale of woe (or more accurately a tale of 'woah, I should have done more research').
I traded some stuff that I wasn't using for this scooter



On paper, it looks like a good deal (speaking of paper, I'm STILL waiting on the guy to send me a title)
So there is no head, "no big deal, it says 157qmj". Well I have learned just because an engine case says something doesn't make it as simple as ordering something from scrappy. Not only is this a B case but it's a variation of the B case with the 2 bolts on the valve cover. The bolts dont line up with a normal gy6 or even the normal gy6b. Someone told me this is a Yamaha clone but I can't tell what it is a clone of.
At any rate I purchased what I thought was the correct head.
It wasn't.
Then I purchased another on that I thought would work. It didnt.
Now the smart thing would be to research and ask around. I did and to my delight and found that a guy in my area was an expert at these machines on the old scoot dawg forum. Unfortunately, I learned later he passed away.
So I have a bike that I didn't pay anything for really, but at the moment it's a paperweight since I've searched hither and yon for a head that seems harder to find than the holy grail.
All is not lost though. There is this www.kazumausaparts.com/index.php?cid=4958

It COULD be the right head.
There is also this:
stlouis.craigslist.org/pts/6007984734.html
But I don't really want to drive an hour & spend 200 buh for an engine that may or may not be the right fit.
Also at my local scoot shop there is a 2 bolt b case engine for $100. At least I can check and see if it fits first.
My final solution is to chuck it in the river.
Anyone else have any suggestions on how to deal with an unusual scooter besides the obvious "don't buy an unusual scooter" or "set it on fire"?

[AtariGuy]

Is there a way to replace the whole top end? A cylinder kit in whole may make your life easier than searching for a lone head.

[thxcuz]

Mar 4, 2017 14:42:04 GMT -5 AtariGuy said:

Is there a way to replace the whole top end? A cylinder kit in whole may make your life easier than searching for a lone head.

I'd have to find the right cylinder too. The two holes next to the cam aren't in the normal spot.

[thxcuz]

Permit me to illustrate:
one gasket came off my scoot
The other one is one I ordered but was incorrect even though it is for a "B" case


The stud holes line up but the holes on the side do not.

[AtariGuy]

Idk if this is wholly correct, but there might be an alternate to your 157qmj engine besides the B code - as explained by scrappydog.

"GY6 ATV Version B - This engine is found almost exclusively in ATV, Buggy, and Go-Cart's. Externally they look identical to a standard GY6, with one prominent, yet subtle difference. They have two bolts holding the cam cover down, while the standard GY6 has 4. The other differences are internal, and on the top end only. The cylinder retaining studs are slightly wider spaced than a standard engine, not allowing the use of standard heads and cylinders. The apperature in the crankcase is larger than normal, which allows a larger big bore kit without machining of the case, but the kits that fit are nearly impossible to find. One last thing on Kazuma ATV engines, model KZM157QMJ. Nothing fits these except Kazuma specific parts. The QJ157QMJ and QJ156QMJ by Quinjiang is also a unique oddity."

So perhaps someone found this "ATV Type B" engine and dropped it in there. Double check your engine code if theres other bits attached. QJ prefix or -3 suffix might explain the alterations you have

[thxcuz]

There is a 3 suffix it's hard to see in this picture but it's there




I've been talking to a kazuma guy in Milwaukee and I don't think it's going to fit. I think the stud spacing is 24.5 on those.

[bluegoatwoods]

I wonder if it wouldn't be less expensive to simply buy a new engine. Some more standard version of the gy6. Surely it'll be simpler.

[thxcuz]

I wonder if I took it to a machine shop they could fill the mounting holes on the side and drill and tap new ones. It seems kind of extreme I guess but that could keep me in replacement parts. I'm not to deep in this scoot money wise with the exception of some gaskets and jets. Scrappy still owes me a refund for the heads I ordered and returned, so besides the stuff I traded for it (which was just taking up space) so I'm out maybe 20 bucks. I'd hate to scrap it but if the parts can't be found it seems like a losing battle. Or I can just sit on it and wait for the right part to fall in my lap

[thxcuz]

Mar 5, 2017 10:13:17 GMT -5 bluegoatwoods said:

I wonder if it wouldn't be less expensive to simply buy a new engine. Some more standard version of the gy6. Surely it'll be simpler.

Perhaps. It has to be the extra long case to accommodate the 16 inch wheels. Then I'll have to address possible electrical conflicts. But that may be my only hope.

[thxcuz]

Though there is no QJ in my engine number, I wonder if the QJ157QMJ head would work.
The cam looks a little smaller too. I'm not sure what's up with that

Maybe it's just me

[thxcuz]

I beleive I found the head I need but cripes is it expensive www.bmsmotorparts.com/bms-scooters-parts/pathfinder-150-parts-catalog/e3-cylinder-lid/engine-head-162mm


I heard these scoots were a little better quality but it's still Chineese, isn't it. $145 and that's without the valves installed.

I have to keep reminding myself that 200 or so bucks IS a bargin if thats all i need to spend to bring this scooter back to life and I shouldn't be such a cheapskate.

[benji]

Your bike kinda looks like a yamaha mio to me. I'd suggest looking for a new motor. It should be about that price, and easier to find parts for. If it's bolts up the same wiring should be fairly simple, all you really need is the right cdi for your ignition system on the motor for it too run.

[thxcuz]

I pulled the trigger and got this engine from my local scooter shop. It's close but it has a drum brake so it's not a bolt on solution but I may be able to use the head and have spare parts when needed.

[benji]

Cool swing arm bracket on that parts motor you got. Wanna sell it?

[thxcuz]

Probably. All I need is the head.