HONDA MELODY 50CC 1982 ATTEMPT TO TUNE!!

if the main jet is pressed into the carb body, that carb isnt really tunable...

have a scan around for something like a Dellorto 17.5mm, all the jets are available for them, and they were fitted to loads of scoots/small motorcycles as std....obviously how the carb fits onto the manifold is going to be an issue, whether its a 2 bolt flange like a speedfight or a male/female connection like most other scoots.

I remember Honda melodys years ago when they were a common site on the roads, usually yellow with a white basket on the front (if i remember properly)

like minor says, its a case of scouting around and adapting things to fit, but seriously that main jet is going to be weak...

EDIT: minor beat me to it on the 17.5mm carb :emb:

And also on the air box, I saw a dyno test years ago in a scooter mag, they tested the difference of an airbox against an open filter on a sport 70 scooter....after much tinkering and rejetting and excess noise the open filter was worth 0.5 hp :tdwn:

The airbox can be modded succesfully if you think its restricting things

 

Ok i'll have a look at another carb etc. Yesterday while i had the airbox on i attempted to tune the carb but it wouldnt hit peak revs. I then removed the airbox and raised the needle etc then retuned and i got the thing screaming! thats why i thought the airbox was restrictive... and yeah its red with a white basket on the front lol although i have now painted the wheels black and removed the basket for the time been... quite retro a few ppl would say lol

 

A lot of manufacturers put a divider in the airbox with a small hole, this causes a nice big depression over the main jet, or as us old skool tuners call it a good signal over the main jet...

why they do this is to increase low/mid range response, and get away with fitting a small main jet, gives good fuel economy :nerd:

the trade off is the top end of the power curve gets strangled, take the small hole away and you get your top end back, and a big dead patch at the bottom end (your strong signal/depression has been taken away)

This big hole needs to be filled in with fuel, so you raise the needle, fit a much bigger main jet
and kinda get it running ok in the low to mid range, and youve got a moped that now gives 50 mpg instead of 100 mpg....goes a bit quicker though :banana:

of course whether you think losing a shed load of mpg to gain a bit of top end is a worthwhile modification, thats entirely up to you...

its trial and error and theres always trade offs and compromises in tuning...

 

i no your wanting to keep the standard engine to tune but have a look at this melody with a dio engine in
http://img529.imageshack.us/img529/1350/img9915yn4sa9bz3xe7.jpg .

 

http://waclark0.tripod.com/id7.html

check this melody with ts1 engine in

 

that thread is 7 year old and look at this quote from it

",wank pm exhaust."

:w00t:

 

I think i'm going to sell the melody after going out on it today, its just really sloooow. Its in good nick now and runs well, but i think i'm just going to be throwing money away. I any one is selling a fast-ish 50cc and live near sheffield etc please get in touch. I lnly want something cheap to commute to work on.

 

Some good information in this thread.

Im selling a aerox but best off getting a piaggio based engine :tup:

you are best off keeping that bike standard, for sell it as like memorbilia for them older people :w00t:

 

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260388846121&ssPageName=ADME:X:RTQ:GB:1123

what do ppl think to that?

 

a grand for a 11 year old scooter without tax or mot,, nice

 

someone on TAG was selling one for like 350 i think, or something like that !

 

Whats TAG pal? have you got a direct link?

 

i think the guys on here too.

 

CZYNRG is that the bloke? i cant post in the for sale section. I'm very interested in the whole bike if some one could give him a shout, only live at rotherham tell him
TAR

 

nah that int him.

called buzzy or somehting

 

Evening, i'm still running the melody and although its not that bad, it will now do 35mph lol i have come across some honda vison big bore kits on ebay....
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=350098558207&fromMakeTrack=true

I've been told that the early vison engines were the same as my melody one, in which case would this fit? it looks the same as mine in the pictures, and secondly would it do much?

cheers