Search found 33 matches

by Pompeydave
Sun Sep 09, 2018 9:12 pm
Forum: Scooterotica Tuning & Maintenance Information
Topic: Mikuni TM28 jetting suggestions please
Replies: 2
Views: 449

Re: Mikuni TM28 jetting suggestions please

By the way the cylinder set up is with the squish set at 1.5mm and the piston sits at 1mm above the bottom of the exhaust port at BDC.
by Pompeydave
Sun Sep 09, 2018 9:08 pm
Forum: Scooterotica Tuning & Maintenance Information
Topic: Mikuni TM28 jetting suggestions please
Replies: 2
Views: 449

Mikuni TM28 jetting suggestions please

Hi all, I’ve got an Italian GP125 with GP200 gearing, a Casa 185 kit that has been bored out to 198, a BGM electronic ignition timed at 20 BTDC, a BGM big bore exhaust and a Mikuni TM28 carb. The carb is the new item. Can anyone suggest jetting, a needle and an atomiser please?
by Pompeydave
Sat Nov 19, 2016 3:07 pm
Forum: Vespa Tech
Topic: 2003 PX125 Disc chronic misfire at speed
Replies: 12
Views: 3386

Re: 2003 PX125 Disc chronic misfire at speed

Hi all, very late update I realise, but just to let everyone know that after all the electrical work I've done the problem did indeed turn out to be a faulty fuel tap- the flow was far too little. As soon as I put the SIP fastflow one on the problem cleared. Thanks for all the advice along the way :).
by Pompeydave
Sat Mar 05, 2016 1:31 pm
Forum: Vespa Tech
Topic: 2003 PX125 Disc chronic misfire at speed
Replies: 12
Views: 3386

Re: 2003 PX125 Disc chronic misfire at speed

Update time- this problem has been on the back burner for six plus months due to me playing with a Lammie engine rebuild. Anyway, I'm back on the case now, and I've changed the pickup. Made no difference, but I have now noticed that this problem seems to ocurr more often when the tank is low on fuel...
by Pompeydave
Thu Feb 04, 2016 10:44 am
Forum: Lambretta Tech
Topic: Casa 185 / RT195 piston edge (deck?) to Exhaust port height
Replies: 23
Views: 4660

Re: Casa 185 piston edge (deck?) to Exhaust port height

Spoke to Mark Broadhurst via email and the port timings are the same whether the kit is MB or Scooter Center sourced. For maximum torque he recommends having the piston edge in line with the bottom of the two transfer ports, which *should* then have it sitting 0.5-1mm above the bottom of the exhaust...
by Pompeydave
Sun Jan 31, 2016 11:37 pm
Forum: Lambretta Tech
Topic: Casa 185 / RT195 piston edge (deck?) to Exhaust port height
Replies: 23
Views: 4660

Re: Casa 185 piston edge (deck?) to Exhaust port height

Ah, interesting stuff, cheers chaps. I'm still confused re whereabouts the piston should ideally be at bdc. My RT195 is a Scooter Center Koln supplied one- I'm sure I read somewhere that the port timings are different between the MB supplied kits and those from Scooter Center- any ideas anyone?
by Pompeydave
Sun Jan 31, 2016 12:59 am
Forum: Lambretta Tech
Topic: Casa 185 / RT195 piston edge (deck?) to Exhaust port height
Replies: 23
Views: 4660

Re: Casa 185 piston edge (deck?) to Exhaust port height

on the rt kit you want piston level with both ports witch should put it 0.5 to 1mm below ex port that's how mb explaines how to set it up Well, if the crown overheats if below the exhaust port at BDC surely MB wouldn't recommend that setting? Garry, do you know where MB state that this is the way t...
by Pompeydave
Sat Jan 30, 2016 12:00 pm
Forum: Lambretta Tech
Topic: Casa 185 / RT195 piston edge (deck?) to Exhaust port height
Replies: 23
Views: 4660

Re: Casa 185 piston edge (deck?) to Exhaust port height

Ok, thats what I had when first setup. Looks like i just need a 0.5mm head gasket to get a 1.3 squish. Cheers for the advice..
by Pompeydave
Fri Jan 29, 2016 8:47 pm
Forum: Lambretta Tech
Topic: Casa 185 / RT195 piston edge (deck?) to Exhaust port height
Replies: 23
Views: 4660

Re: Casa 185 piston edge (deck?) to Exhaust port height

Still struggling with this problem albeit on a different engine with an RT195 kit. I can get the edge of the piston in line perfectly with the bottom of the exhaust port but the transfer ports are just slightly lower than the piston edge. Is this a good level for a torquey setup? I'm using a 60mm cr...
by Pompeydave
Tue Nov 17, 2015 10:18 am
Forum: Lambretta Tech
Topic: Belt drive fitting
Replies: 4
Views: 1024

Re: Belt drive fitting

It's supposed to give a smoother running, quieter engine with less friction than a chain. Reckoned to be good for 40,000 km's too.