Scooterotica

Noplastic wrote:

coaster wrote:

Noplastic wrote:
Arrgghhhhhh!!!! Why didn't you tell me before!!! I just came from the garage where i spent 4 hours until i figured that out myself!! I was close to dismantling the whole electronic sistem!! I even went to buy the multimeter!! (19€). Now it sparks big time!!

You should try READING other replies to your problems then you wouldn't have wasted your time

coaster wrote:.........because it is also possible that the colours used on your old stator don't correspond with those on the BGM, the Indians were notorious for using none standard wiring

i tryed all the options suggested here in the forum (including changing the indians connectors with the bgm spade ones... twice!) and yours was one of them... Corrado's advice was a little different since he had EXACTLY the same problem i had which would have automatically excluded all the other options. I wouldn't call it waste of time anyway since now i know lots more about the electronic igniton of my GP

Agreed, Martins advice was very clear and precise but is exactly what I meant. Totally agree with you that time spent fiddling is seldom wasted if it takes you into new places. Glad you've got it sorted now

coaster wrote:It depends on the quality of fuel that you will be using and the amount of Ethanol in it. The safe setting for 5% is generally considered to be 16 or maybe even 15 in a highly tuned motor. 17 would be the limit, I wouldn't personally run with anything more advanced unless an retard unit like an Augusto was fitted.

Good to know, thanks. I normally run the 95 octane gasoline that i find at the gas station. The choice is between 95 octane and 98 so i go for 95. What % of gasoline/oil mix would you recommend on a GP 200 with Mugello 225, Jetex 24 carb and Indian clubman? I have just fitted the Mugello kit, so i have to run it in.. i made a 2% mix... is it too lean? Today im testing the new kit so i wouldn't like to make mistakes.

2% is not enough for a Lambretta, I use a symi or fully synthetic oil mixed at 3% (150ml in 5 litres). 4% is used by others and I would too if I was using plain mineral oil. You also need to understand that the fuel/oil mixture actually gets RICHER not weaker as you reduce the % of oil. This is because adding oil displaces the amount of petrol in the mix so the fuel/air ration is weaker. This may not make very much difference but is worth bearing in mind.

Bearing in mind that one of the main reasons for mixing oil is to lubricate your crank. The quality of your crank should be taken into account when deciding on your mixture. That's one of the main reasons Vespas run @ 2% as the fuel is directed straight onto the crank thus generating more efficient lubrication. A well ported barrel with a quality crank should have no problems with a 2% mix (don't sue me if i'm wrong !!).

Hi Mick, you're saying that even though Lambrettas are piston ported and would require higher % of oil than rotary valved Vespas, since im running a Mugello 2% mix should be enough? Did i get it right? I'll probably add 1% oil to my mix and run it at 3% at least for the run in...

I have another (silly) question: On electronic Vespas flywheel/stators there are 2 marks "IT" and "A", generally IT corresponds to 18 degrees and A to 23 degrees according to the factory settings. Now if i rotate clockwise the BGM stator to the max how many degrees i should approximately have? I'm asking cause i won't be able to strobe it for the next 3-4 days but i would like to run the scooter until then without making a hole into the piston or seizing...

Noplastic wrote:Hi Mick, you're saying that even though Lambrettas are piston ported and would require higher % of oil than rotary valved Vespas, since im running a Mugello 2% mix should be enough? Did i get it right? I'll probably add 1% oil to my mix and run it at 3% at least for the run in...

Not saying that 2% would definitely be bad but I don't know anyone that would use less than 3% on a road going Lambretta. If you think about the amount of damage that could result if the crank was to let go at speed, broken rod through the crank case, bits of needle rollers blasted up the transfers and imbedded in the head, wrecked piston and bore Not worth the risk imho.

Re temporary timing, I'd rotate it fully clockwise which will retard it to about 17 to 18 degrees. I'm not sure if BGM have ever addressed the problem but you used to have to file the slots to get enough movement to reach 16 or 17 degrees.

Allrite..back from the road test and i have to admit that the result was quite depressing.... When i bought the Mugello i was expecting some sort of Pinasco/Polini kinda thing (those of you who ride Vespas know what im talking about) : plenty of brutal torque at low rpms and some good cruise speed for touring. Instead what ive found is an engine with a totally dead bottom end, fast like my granpa´original APE car and that never (i say never!) reaches the torque. Looks like the only gear that it actually pulls is the 2nd!! I have to gear down everytime there's little uphill or it literally sits down the road. Besides, even though the idle screw is all screwed in the engine doesnt tick over. As soon as i leave the throttle (at a traffic light for example) the scooter dies. I can't understand: I dremeld the stator and i turned it fully clockwise, the carb runs original dell'orto atomiser and idle jet. The main jet is a 122, original pipe and original filter... so...what's wrong??

could it be the gear ratio? Maybe the standard SIL 200 transmission is too long and needs to be shortened? Do you have any suggestion to pull all the gears and have a decent top speed with my set up? Maybe i should open a post appositely for this problem?

The standard SIL200 gearing is quite low (5.22 final ratio) so it won't be the gearing that is the problem.
What is the actual ignition timing? You can't just turn the stator fully clockwise and hope it's correct!
If the ignition is too far retarded it could cause your problems.

Minority wrote:The standard SIL200 gearing is quite low (5.22 final ratio) so it won't be the gearing that is the problem.
What is the actual ignition timing? You can't just turn the stator fully clockwise and hope it's correct!
If the ignition is too far retarded it could cause your problems.

hmm good to know, one less problem to check. but there's something wrong...i just can't understand what...today i'll try to put the timing as it was before around 21, if the problem is the timing i should notice some difference at least. i'll also check the carb again. what are the symptoms when the choke doesnt come back to the off position completely?