MOPED ARMY

Blow by without question. The remaining rings in first pic are still wedged in grooves. Overheated without question. I'm sure the underside of piston dome is charred, but a pic would be nice too. That clip came out and seized it. The bottom of cylinder broke off when you had to force it apart becasue of the wedged circlip. 400 degrees is danger zone and you exceeded that by how much total? Looks to have reached 400 degrees more than once. Everything in pics is toast but I hope rod and crank aren't.

I had this same kind of blowout on one of mine and that clip trashed the cylinder. Wanted to kick myself. The kit only had about 500 miles on it. I'm guessing the clip just didn't sit right and wiggled loose (edited)

:) (edited)

I ran over 400 several times and thought it was no biggie, although it did make me nervous and hoped wouldn't go higher. Sorry if this has already been discussed in full elsewhere here, but what would you say is a normal/safe head temp to run on a kitted Hobbit?

The problem with hobbits is heat soaking. I've got three and each has a unique attempt to mitigate it.

1. 60 cc stocko shocko ...dos cycles motzig obtained jailing head ...major improvement. I used a Cheetachrome pull start because it's got a pa 50-1 crank so one way bearing won't work without major changes.

2. Athena 70 cc kit with derby head remachined and decomp sealed And studs slotted - one way bearing .

3. Mallosi watercooler kit with Bosch 12 v pump, radiator and onotjer one way bearing.

Otherwise u r limited in how u ride your moped. If u keep a Hobbit stock it's designed not to seize because it produces less heat.

I think this one I just didn't seat right. User error. I've been riding them for years and it's the only time it's ever happened. I've been told to use clips with no "ears" on them or at minimum only one. I think I got lazy on this one because that was all I had. The two-eared ones are too easy to bend and deform so they don't seat right. Also, the opening on the clip faces towards the bike, not away.

Marc,

Did you get the PUCHONDA sport touring 46mm head from Treatland to work? I am considering this head with the Wizard 70cc kit and 2mm spacers.... Sure would be nice if it cooled things down.

Thank you, these are awesome links.

Marc, do you mean the Hobbit 44mm Oversize Head at Dos Cycles (about 50 bucks)? I searched for "hobbit jailing head" but could not find anything..

Sounds like you are running 126mm studs on that, M7 (hole-enlarging) or M6 (no-enlarging =))?

I am thinking about using that head with either the Trick or Treatland 46mm Wizard Kit (and 2mm base plate spacer),.. or if I'm feeling spendy, the 47.6mm Athena kit (looks like also w a base spacer).

The other head I saw on Dos Cycles is the Moped Factory "Big Fin" 47mm (which would go best w the Athena kit?), but that would mean I am feeling particularly-spendy, and need to take someone out for a Steak & Lobster dinner at Seize-ler.

This is the dos cycles jailing Hobbit head. I'll post some more in a second. This head works. It's not a squished head btw. But it's massive for cooking and works.

Ok now... These are treats Puch Hobbit heads. The one on the left is the 47.6 Athena head. This one has a reasonable mods. The deepest part of the head is nowhere as deep as the right one which is the 46 mm mild one and not to sound to much like Donald Trump but it's an embarrassment that treats when told that over three mm of the standard b6hs stick out and the heat transfer reliably fouls the plug they told me I was obviously in error. . Well it is a pos that I will not sell anyone and why should I be so nice when I asked them to get this out of my life I got lip only. But the other one isn't as severe and faulty machining down so only a mm sticks out and I think it will run perfect if on the Athena. I'm holding onto my modded metrakit head. I drilled both out to m7 and they will slip on just fine. Let me know if u want the left one. Right is not for human use. Sorry Benji but when I contact treats to tell them something isn't right u Betta believe it. I've been at this for a while now. Oh putting a copper washer to make the plug flush. Right ....doesn't work. Too much heat. Spark plugs are designed with the metal around it in mind ... I am in a bit of a foul mood. Must be the heat.

Sweet,.. so this is the Motzig Jailing $50 head that will work?..

But with which kits?

1) Athena 73cc - $185

2) Stocko-Shocko 60cc - $85

3) Trick-or-Treatland Wizard 70cc (is this kit officially garbage w/o an upgraded piston? =)) - $667

Piston bottom looks good. Heat was never an issue on this motor. That circlip was though. Chamfer the ports to prevent snagging a ring. Always check ring end gap.

Hmm, ok. I may do the Athena, so may hit you up for that squished head. $50 instead of $75 for the head would take some of the Lobster off buying the Athena, even though I have been reading the Athena is a work of art and well worth the extra $.

I went to pull-start, no pedaly for me =)

Will no-decomp still be a problem w a pull-start?

Also, is there anybody out there?....

Um, I mean, that has a Wizard Kit and loves it?

I really want to try and go all-aluminum so all the Hobbits's partses will expand together happily and stay nice & cool under pressure, but I also want to try and save some $ so Wizard Kit looks tempting. Does the Wizard piston really blow(-by) so bad it must be replaced to make the kit usable?