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by Jack221
Tue Sep 16, 2014 4:22 am
Forum: Vespa Tech
Topic: Engine Build - Advice needed
Replies: 18
Views: 7780

Re: Engine Build - Advice needed

Yeah, we are not talking about the old Malossi 210. That works with a 60 crank. In fact the best thing that can be done with the old 210. The 210 MHR is not the same, it has much wilder port timing and will make more of a sprinter with a 60 crank. Is yours really a 36 tooth 3rd or do you mean 37 too...
by Jack221
Mon Sep 15, 2014 1:20 pm
Forum: Vespa Tech
Topic: Engine Build - Advice needed
Replies: 18
Views: 7780

Re: Engine Build - Advice needed

Originally the 21 tooth is from a 150 but you can get them in both clutch types now from SIP. The 21, 22 and 23 all work on the 65 ring gear so it is possible to change them easily to get the highest gearing that will pull 4th. The MHR 210, a 60mm crank and a 23/64 primary shouldnt all be in the sam...
by Jack221
Sun Sep 14, 2014 6:30 pm
Forum: Vespa Tech
Topic: Engine Build - Advice needed
Replies: 18
Views: 7780

Re: Engine Build - Advice needed

A 23/64 cruiser gearbox is going to go ok but will never really make a proper quick scooter. Even the standard 23/65 is already too high, for fast road. If looking for high speed is is best to reduce the gearing to 21/65 and port it to aim for 9000 rpm in top (which is about 88mph on GPS and safe pi...
by Jack221
Mon Sep 01, 2014 11:09 am
Forum: Vespa Tech
Topic: Reed Valve
Replies: 18
Views: 4173

Re: Reed Valve

If anyone is struggling to make a decision on reed or rotary here is my two penneth. It all depends what you are trying to do. If you want a carb bigger than 30mm then reed valve is the only way, no choice. Up to a 30mm carb a correctly modified rotary induction always gives more top end power. Reed...
by Jack221
Mon Jul 14, 2014 4:34 am
Forum: Vespa Tech
Topic: 172 porting
Replies: 4
Views: 1638

Re: 172 porting

If you are looking to increase high rpm power, the easiest way when you don't want to make any permenant change is just to jack the barrel up with a load of base gaskets or aluminium packer. Try about 1mm first and see how it goes. If its better try some more. Once you getting revving where you want...
by Jack221
Sat Jul 12, 2014 12:29 pm
Forum: Vespa Tech
Topic: PX200 wont start when warm
Replies: 15
Views: 5012

Re: PX200 wont start when warm

Well it's not the air screw then :) It is something making it too rich though. How about the air hole in the top of the pilot jet, all clean? Is it the correct size jet?
Like Grinch said, could be the float needle. If you leave the fuel on, does it start cold without choke?
by Jack221
Fri Jul 11, 2014 12:46 pm
Forum: Vespa Tech
Topic: PX200 wont start when warm
Replies: 15
Views: 5012

Re: PX200 wont start when warm

If everything else is ok then the pilot circuit is too rich. Check the air screw on the back of the carb is no more than about 1.5 turns out.
by Jack221
Tue Jul 08, 2014 2:10 pm
Forum: Vespa Tech
Topic: vespa t5 gearing
Replies: 13
Views: 4200

Re: vespa t5 gearing

ducksta, at what rpm was the 17.8 bhp? You can work the gearing back from there
by Jack221
Wed Jul 02, 2014 7:10 am
Forum: Vespa Tech
Topic: JL end can mounting
Replies: 15
Views: 3289

Re: JL end can mounting

Same story with my mild steel JL. Original bracket broke in a month. Made a new bracket from some scrap and a rubber mount from Halfords and it's been on for a year now :D

I had a stainless exhaust once and once only. It was like it was made of glass.
by Jack221
Sat Jun 28, 2014 6:06 pm
Forum: Vespa Tech
Topic: carbon clutch plates
Replies: 11
Views: 3115

Re: carbon clutch plates

Thats a good point! For them not to slip you need big springs too. I have 10 SIP XXL springs in an MMW superstrong basket.

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