My new set up.

[Scooterdude]

Right ive been happily riding round with my PHBH28 and Scootopia clubman for a good while now without any problems but recently decided to try an expansion chamber so after getting my delivery of a Darrell Taylor modified TSR Evolution i chucked it on and went for a blast, tried a 114, 112 and 110 main jet but no good couldent get it on the pipe, just spluttered and with no power anywere throughout the rev range, must admit i was very disapointed to be honest so tried the 107 main i had used with the clubman and bingo! off it went...but was running seriously lean about 3/4 throttle so on the advice of Harry Barlow i changed the attomizer to the larger AV268 (was AV267) pissed about with different needle settings (x7) but now running far to rich midrange and wont rev.

The orriginal plan was to run the carb through an opened up air box using a BGM filter so as to keep it looking standard, spoke to Darrell he told me to put an AV266 in disconect the filter and put a much bigger main jet in just as a trial, which i did apart from the AV266 which i dont have so put the AV267 in and a 119 main....wow what a transformation, pulls easily as hard if not more so than it did with the clubman in the lower-middle rev range then takes off like a race horse and keeps on going! I was clocked at 73mph with the clubman so God knows what it will do now.

The one thing that bothers me is running it with an open carb so just bought a short bell mouth with a gause.

The only gripe i have it it smokes badley on tickover and theres a slight hesitation just as it sets off, its got a 50 pilot jet at the moment, im wondering weather to try something like a 45 or 48 pilot or do i need a different needle just to clean/sharpen it up?

[purple_pill67]

What top end is it out of interest?

[Scooterdude]

What top end is it out of interest?

It's loosely based around a Mugello 186....kind of..

[bazza3004]

Does it smoke all the time low down or after you have give it a blast. Also what 2t oil are you using.

[Scooterdude]

Yes smokes all the time on tick over but clears just as I set off which is what makes me think pilot jet needs coming down a bit but reading through the set up section of this forum a 50 pilot is nothing out of the ordinary.

Oil, I'm just finnissing off my second can (4litre) of Silkolene scoot 2, then I've got a litre of sip synthetic to get through then it's on to the 25 litre drum of Groundsman I've recently bought then I shall stick with that brand (works out at £2.80 a litre). All at 25:1 or 4% if you prefer.

[mick1]

The 4% could be the cause of the smoke.........I run 2% with no issues.

[Scooterdude]

Thanks for the replies, now ive got a bit of time ive been tinkering with it (cant get out just yet as its p1551ing down here) and ive discovered the AV 267 is in fact an AS 267 so ive outed that and fitted an AV 266.

I take on board what Mick1 above says about the oil but ive recently rebuilt an engine for someone running a cheap 185 top end and sh2-22 carb using 4% mixture and although it smokes a bit on tickover its very snappy on the throttle.