Dellorto PHBH

[nelson pk]

Really, i thought you didn't like tuning books and the people that read them if i remember correctly.

I wasn't thinking of reading it. But I'm nearly out of scooter magazines, and they're very useful to use with masking tape when spraying.

Thats quite probably all it would be good for.
Would probably end up being pulped with Alan Partridge's book

[rosscla]

With the amals afaik there's only the one 2t needle, the 2d1, so the only variation you got is the needle jet

[Special X]

Camlams recomended jetting for 186/200 Mugello with an ancillotti and PHBH 30mm

45 slide (OK)
X2 needle (way too rich for an AV atomiser X7 would be better)
AV266
105 Main (wrrrrrrrrrrrrrrrbang) needs a 120 ish
53 idle
50 starter

Interesting stuff their Nelson, my interest is 'piqued' (see what I did there?). I've holed pistons using both my 30mm PHBH Delly & 34mm Mk2 Amal using AF Rayspeed's & CamLam's jetting recommendations on my TS1225 with AF NK road pipe whilst only 'cruising'. I generally ride conservatively, so for ease of use I'll give you my 1/4 to 3/4 throttle settings only.

Delly: AV266, x7 (2nd clip from top), 150 main, mixture 3.5 turns out. Would you go for AV268, X2 (2nd clip from top??), 130-135 main?
Amal (power jet blocked off): Atomiser 107, Needle 2D1, 350 main, mixture 1 turn out. Have you (or anyone else) got a 'safer' Amal atomiser/needle set up?

You may add the obligatory disclaimer in your reply , I'll definately not hold anyone culpable should I heed any advice given............now where's that shylock ambulance chasers number? .

Nelson has moved the goalpost on me there by talking reedvalve motors. I quoted Camlam on a 200CC MUGELLO. An X2 needle and AV268 is ludicrous. Attempting to hold the insanely rich lower midrange mixture and very rich upper midrange mixture down by usin a 105 main will only help until WOT when the 105 won't pass enough fuel.

I ran my 225 Monza with AV268/X13 with a 55 pilot and 142 main jet and it was safely rich in the atomiser/needle range. X2 needles are really not suitable for the AV range of atomisers but usable with the AS series.

If anyone wants to sacrifice a mugello run it on a PHBH30 with 105 main jet and melt it down. 105 is going to be marginally weak on a PHBH26. Exactly what I meant when I said please don't give recomendations that will blow peoples engines. BTW those jetting recommends on camlam were there before they worked with CE so they are not from his dyno.

[nelson pk]

Special X said "BTW those jetting recommends on camlam were there before they worked with CE so they are not from his dyno."
Your wrong mate. They used to have settings based on their dyno sheets from a dyno operator in Cambridge who liked using a lot of AS atomisers. The old sheet of carb settings is not there anymore as they used to recomend AS266 with X2 or AV266 with X2 or X7.

The likes of the AV268/X2 atomiser with 40 - 50 slide have been put on the "newer" jetting recommendations from average jetting requirements from Charlies dyno.
I've seen the dyno sheets for the monza mate at Cam Lam and they are all around AV268/X2 130-135 main 50 slide (mugello 225 the same but around 120-125 main jet but usually with 45 slides)

I also did point out that it is not worth jetting a bike these days without DYNO or EGT to be SAFE!

P.S Look at the scootering article on the adjustable power jets. JUNE 2010. (i have it kicking around cos i run a powerjet the same)
Charlie recomends for 30mm PHBH, starting point on reed motors, X2 needle/AV268, slide 40-50, float needle valve 300-350, main jet 5-8 numbers less than running without powerjet.
Dont say this is different because it runs a power jet either as with a power jet you generally just decrease your main jet size.
Now look at cam lams jetting for monza with expansion.....X2 needle/AV268, slide 40-50, float needle valve 300-350 main jet 130......spooky!

[nelson pk]

Lets finish this off cos i'm just cheesed off now

If you are unsure about jetting and need to ask advice on jetting and are not willing to risk your latest £2000 engine going bang in the short term or long term THE BEST ADVICE YOU WILL RECIEVE is to get it to a DYNO with an operator who has an excellent name in scooter tuning, there are guys on this forum who suit the bill btw
It will be the best value £200 you will spend.

Done.

[soosh]

How on earth did we get by before dyno`s?
If it cheeses you off,stop reading and replying.
Im glad i couldnt afford dynos years ago as i learnt much more by doing it the long winded way.
Only ever holed one piston.

[nelson pk]

How on earth did we get by before dyno`s?
If it cheeses you off,stop reading and replying.
Im glad i couldnt afford dynos years ago as i learnt much more by doing it the long winded way.
Only ever holed one piston.

I dunno mate. How on earth did we get by before mobile phones.......technoligy is s**t isn't it.
Dunno why you bothered to get yours dyno'd by reedspeed either.
See ya!

[Special X]

I know a famous tuner, well respected, gets results. He has access to a dyno, but when he builds an engine for someone he jets it on the road with plug chops.

If anyones got an AV268 and an X2 needle in their box and runs a 200 kit. I'd like to ask them to try it in their PHBH and then post the results. You can put a stupidly small main jet in if yuo want to see if that tames the AV268/X2 if you want but for goodness sake don't run WOT for any length of time or blame me for the results.

[soosh]

How on earth did we get by before dyno`s?
If it cheeses you off,stop reading and replying.
Im glad i couldnt afford dynos years ago as i learnt much more by doing it the long winded way.
Only ever holed one piston.

I dunno mate. How on earth did we get by before mobile phones.......technoligy is s**t isn't it.
Dunno why you bothered to get yours dyno'd by reedspeed either.
See ya!

Because i can afford to do that now

[nelson pk]

I know a famous tuner, well respected, gets results. He has access to a dyno, but when he builds an engine for someone he jets it on the road with plug chops.

If anyones got an AV268 and an X2 needle in their box and runs a 200 kit. I'd like to ask them to try it in their PHBH and then post the results. You can put a stupidly small main jet in if yuo want to see if that tames the AV268/X2 if you want but for goodness sake don't run WOT for any length of time or blame me for the results.

No need, i'll tell you. If someone tries it and they are running a 40 slide like a lot do it'll run like a bag of shite but it wont go pop.
Also that cam lamb jetting example is running a clubman type exhaust (which i have already mentioned, yawn )not an expansion so dont go telling people to try it when they might have an expansion on their bike because that will kill it as you do need to up the mains sinificantly if running an expansion compared to clubman style.....
2 stroke exhausts have a lot of control where your bike makes power and how much power it makes and how hard it pulls, for the second time, they can make a huge difference to fuel supply!