> live ɘvil Wrote:
> -------------------------------------------------------
> > Pablo Rivera Wrote:
>
> > -------------------------------------------------------
>
> > > live ɘvil Wrote:
>
> >
>
> > > -------------------------------------------------------
>
> >
>
> > > 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 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?
>
> I can't say for sure with a 70cc, but this original honda 49cc kit I
> have on an nc50 express always has run hot wide open on warm days. Its a
> common complaint with cast iron Hondas. I suppose retarding ignition
> timing would help. A colder plug only seems to delay the inevitable high
> temps on mine.
>
> When I took mine apart it looked a little toasty but the rings and
> landings were not full of crud.
>
> What oil and mix are you using? How many miles on this?
> >
I am now strongly considering an aluminum cylinder kit (yes I know more devastating if it *does* seize) and fatter aluminum head (but still air-cooled), maybe even a bigger/better carb and less restrictive intake to take a stab @ cooling this Hot Mama down. Does anyone know anything about exhaust cooling rings?
I was running 60:1 Saber, not sure about the miles, don't have an odometer and my speedo stopped working (would make things fun if I got pulled-over) ;-D
Just came to think of it though, bike was running great at higher altitude ~5000 ft, then I moved to lower altitude ~2500 ft and much warmer temperatures, so DOH! Did I totally goon-it not re-jetting? Was using an 82 jet on stock carb I hadn't cleaned for a while, and feel like I've read about Hobbittss jetting 90-something, 100-something with bigger carbs --- maybe I was running tooo lean??!? ;-o