heat problem with malossi 136

[amazombi]

first, thanks to everybody to share its experience in English .

that helps me enormously...

to summarize, before begin again my tests, I must :

- increase squish clearance to 1,2mm

- put 17 degrees to the advance

- find a richer needle and to buy main jets until 300...

( and change my piston as soon as possible )

other ideas on the origin of my problem ? 

others questions :

- do you put oil on Ramair air filters ?

- do/can I modify engine cover to have better cooling ?

<{POST_SNAPBACK}>

hi,

if i were you i'd start by setting the ignition to 17° or so and then getting the carb right. i believe you said you have also tried a 30mm phb, possibly you could get a few jets for that easier and faster than the strange mikuni parts you'd require for yours.

[jean-yves]

yes, a friend of mine loaned me his 30 PHB last week. I wanted to try another carb to be sure, or not, of mine...

for the story, he just bought a 210 complete motor which was still in his car... I'd just have to take parts I needed :grins:

that the day i'd installed the spacer beetwen the head and the cylinder... (so the squish clearance was about 2,2mm)

I know, it's better to do only one test at the same time, but it's due to the occasion...

we puted the needle the higher we can to be sure the mixture was rich, but we had only one main jet, rather poor. I've tried 20/17/14 ignition timing...

the result was not better than with my mikuni... same problem occurs, in low speed, always this sensation that the cylinder 'swallow' too much air... sensation guaranteed because this day the engine seized...

but, it's true, we haden't enough jets to be really sure to have a good carburation...

it's that day I tried too other petals (malossi fiberglass). I thought that mine were perhaps damaged... but at theses revs, no real effect...

ignition timing had an effect... towards 20°, reprises were better (i think it's due to the low compression at this moment...) but when the engine seized it was near 17....

the engine is disassembled, if you want to see something in particular, I can take a photo...

Bearbeitet 4. Mai 2005 von jean-yves

[jean-yves]

...

Bearbeitet 8. Mai 2005 von jean-yves

[jean-yves]

yeah !

I'm proud to announce you that my scoot finally works !!!

I've solved the most of my problems...

now my cylinder does not heat too much anymore. I've done 2 things for this :

- I've modified my needle jet (cause I've not found another one enough rapidly), then my mixture is richer in the first part of the acceleration... I have a Bleed serie modified to a Primary...

- I've changed my ignition captor. it was broken, that's why my engine do not take high revs... I was in error to think my main jet was too big...

I've still some settings to modify to run better but it's not too bad now.

Saturday, there was a race in the south of France, organized by the Celtic Scooter Club, onto a karting circuit... I won the race (smallframes tuned)

let's see how it feel... (1,4mo)

Thanks to all for yours advice, It has helped me

I'll change my piston rapidly...

Bearbeitet 29. Mai 2005 von jean-yves

[Paola]

the link doesn't work for me

but congratulations anyway

you need a small GSF sticker on your vespa. :grins:

regards

Jan