180 polini

[alanw]

px with 180 polini kit on we purchased about a month ago done some work on it but now we are starting to use it it looks to be running to rich the main jet size is a 160 which to me seems to huge, any one have any ideas if this sounds to big (plug getting very black)
thanks all

[Lan]

160 thats massive you dont need even close to that what carb have you got a si?

[alanw]

i'm glad you agree, dellorto si20/20 i was going to go down to a 130 to start with but even that i reckon could be too big
the engine is out of a 03 px with the 180 polini kit but at the moment standard exhaust
opinion on a 130 jet

[Lan]

go for a 120 and then down from there you best bet would be to start with a si 24/24 E of a p2 and start with a 120 jet on that

[Lan]

when you think youve got it right do a plug chop and it should come out a chocolate brown colour

[dto79px]

alanw said:

i'm glad you agree, dellorto si20/20 i was going to go down to a 130 to start with but even that i reckon could be too big
the engine is out of a 03 px with the 180 polini kit but at the moment standard exhaust
opinion on a 130 jet

my 79 p125x has same set up , a dr180 kit (same as polini) and running standard carb and exhaust the main jet is 110 and runs perfect , colour on plug electrode is dark brown

but start with a bigger main jet and work down till it suits your engine and plug colour is right

hope this helps

[alanw]

just borrowed a 110 runs fine now plug still looks a little black as long as it stays black will leave for a week or so and see it how it looks then
thanks all ,the second opinions give you a bit more confidence to try brill

[dto79px]

in normal riding plug will be black/sooty colour
do the plug colour test strait after a longish full throttle run

[alanw]

[do the plug colour test strait after a longish full throttle run/quote]
will have to wait for that bit still only got 250 miles on the barrel/piston

[Lan]

btw dto the dr isnt the same as the polini the polini has more ports larger crankcase intakes and it will perform better than the dr providing the crankcases are ported, and clean the plug so you know exactly what colour you are getting

[Lan]

it should be choco brown when you do a plug chop

[guppstah]

Whats a plug chop?

[dto79px]

guppstah said:

Whats a plug chop?

a way of getting jetting right when fitting a kit or a sports pipe

clean plug or fit a new one ,take the bike for a good 5 mile full throttle run , return home and let bike cool down then remove spark plug and check colour of end .

light brown/white = to lean ( go up main jet size )
black sooty = rich ( go down main jet size)
chocolate brown = spot on main jet size

[alanw]

[/b remove spark plug and check colour of end .
lockquote]

it was still purple when the coppers turned up and said you can put that way mate ;D ;D ;D ;D ;D ;D ;D

after a massive petrol leak from the carb connection today it was took on a approx 50 mile run
the plug was brown on the electrode but black around the outer so i reckon we aint far out give a little longer may go one smaller but will wait and see

[dto79px]

alanw said:

the plug was brown on the electrode but black around the outer

sounds perfect to me would leave at that as you don't want to go to lean

[Lan]

dont go one smaller yet just run it in like that once youve completed running in then you can get your jet perfect

[alanw]

again thanks all gotta find summut else to talk about now

[alanw]

[/qagain thanks all gotta find summut else to talk about nowuote]

found summut found summet
just took the above scoot out stepson riding 70 miles plus, me on me T5 BUT when he has to stop on a hill as he pulls away it dies and struugles to keep going
uphills as long as he doesnt have to stop pulls no problem at all only pulling away uphill struggle, er feck