Hi SIP Board peeps.
Can any of you experienced T5 tuners out there help a newly kitted scooterist?
My setup is this:
T5 Malossi 172, Taffspeed pattern cyl head profile, Malossi read valve (case inlet mildly tuned - not as far as the Malossi kit leaflet spec), Delorto PHBH30mm (running with no air filter - until I get my order from SIP). Jetting Main: 135 (took it down from 140 today), Idle 55, Air corrector 70, Needle X3 (2nd clip position from top) airscrew 2 turns out, Sip Performance pipe. , Cosa 21T clutch. Spark Plug: Bosch W2CCand W3CC (approx NGK B9 & B8-all in a 1969 GT frame.
The engine was fully re-built when the kit was added (inc new crank). Now any of uz with even without a pocket calculator handy will work out that to be a whopping investment - one that I don’t want to b*** up.
The kit is just finnishing running in (done 400 mls) and I am starting to open her uop a bit. The way she is performing has me ‚bricking it‘ that I am gonna seize/trash the engine coz it aint set up right.
To get me on the right path, can anyone (a few of the SIP team are running this set-up right?) give me a ballpark jetting for this set-up?
A sthe engine has ‚bedded in‘ and loosened up, the bottom end has improved a bit - not bad at all I have to say approx equal to the standard T5. Where the standard left-off I now get ‚waaaaaaaaaaarp‘ in 1st & 2nd and sometimes in 3rd - the take off is really amazing! (picture scooterist only attached to the scoot by the handlebars). I have not run her at full throttle for more that a 2 mins - not dared to: The engine feels rough after hard acceleration and will not pull 4th well. Today I was experiencing power fade in 3rd at full throttle (acceleration then deceleration) and still no performance (powerband) in 4th - I suspect overheating as after hard acceleration in 2 gears the ‚powerfade‘ occur - my clutch hand now ackhes from hovering over the clutch leaver incase she starts to seize.
So as mentioned can anyone please advise ballpark jetting I can get this right & rule it out of the problem?
NB Since I adjusted to run leaner (see above) the powerfade/roughness (overheating?) has become worse (but the bottom end crisper). She is not ‚4stroking‘ as I would recognise it (I have experienced this on an overjetted roraty valve) but overrichness may be disguised by the read valve (this is my 1st).
Plug reading: Hard to tell I am running Full Synth and have not been confident enough to run to a propper ‚plug-chop‘. From the plug colour that I can see it’s milk chocolate brown, milk chocolate (think cadburys milk tray - not milkybar kid) base was with slight oil deposit before down jetting today, after today’s ride there was a small light deposit on 1/4 section of the insulator.
Well I should perhaps try a tank of cheap & cheerful mineral oil to get a better reading - but under the circumstances would you? Any advice is more than welcome - I think I should re-visit the jetting - anyone else running this set-up or have better advice?
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