Search found 138 matches

by Warkton Tornado No.1
Tue Jun 30, 2020 12:12 pm
Forum: Lambretta Tech
Topic: Main bearing alignment?
Replies: 5
Views: 372

Re: Main bearing alignment?

As the subject of crankshaft flex has now been mentioned, my belief is that it is something not fully understood. Probably by me especially! I once built a race engine in which the drive side deep groove ball bearing was replaced by an NU type roller bearing of the same dimensions, but was in three ...
by Warkton Tornado No.1
Tue Jun 30, 2020 2:48 am
Forum: Lambretta Tech
Topic: Main bearing alignment?
Replies: 5
Views: 372

Re: Main bearing alignment?

I've never had to check, but I understand that if alignment was likely to be out, due to extensive welding, then axial alignment would need it. Unless I pulled in a favour with somebody that works in a machine shop with XYZ inspection facilities, I suppose the crankcase/magneto flange assembly could...
by Warkton Tornado No.1
Mon Jun 29, 2020 6:56 pm
Forum: Lambretta Tech
Topic: ts1 yamaha reed valve options
Replies: 1
Views: 207

Re: ts1 yamaha reed valve options

I don't know which reeds are the best, most compact or economically priced, but, like you, the knowledge is out there & it would be good to have it shared. What I can say is that any packing will be necessitated through the 'depth' of the reed assembly, bore diameter, boost port size radially & fram...
by Warkton Tornado No.1
Thu Jun 25, 2020 11:37 pm
Forum: Lambretta Tech
Topic: Sealed bearing on crankcase side?
Replies: 8
Views: 993

Re: Sealed bearing on crankcase side?

There are three main types of variations on the generic deep groove ball bearing: Open Shielded Sealed The 2RS type has lubrication built in. That's not where it ends, though. Maximum speeds are less for grease lubrication than for oil. That's because of the difference in lubricity. Greased, sealed ...
by Warkton Tornado No.1
Thu Jun 18, 2020 5:17 pm
Forum: Lambretta Tech
Topic: Piston circlips.....
Replies: 4
Views: 419

Re: Piston circlips.....

I do not know what sort should apply, but in any case, use a magnifying glass or needle to 'feel' the groove profile.

If they are to suit a 16 mm wrist pin, I probably have spares of either type you can have. But do please check first :D
by Warkton Tornado No.1
Thu Jun 18, 2020 4:19 pm
Forum: Lambretta Tech
Topic: Effect of humidity and air temperature on carb performance
Replies: 55
Views: 9808

Re: Effect of humidity and air temperature on carb performance

i ran a pwk ,think it was a oko from scootrs,for years on a cast 200 top end,scorpion exhaust,didn't know much about jetting then,but put a 115 main in,think i was lucky,because i hit the sweet spot straight away,and thrashed it mercilessly,keeping up with the ts1's,never let me down,and did high f...
by Warkton Tornado No.1
Sat Jun 13, 2020 12:12 am
Forum: Lambretta Tech
Topic: Effect of humidity and air temperature on carb performance
Replies: 55
Views: 9808

Re: Effect of humidity and air temperature on carb performance

I suppose that I have my most familiarity with Dell'Orto carburettor's, principally VHB's & the VHBC's. Saying that, the PWK's have been an absolute doddle to set up IMHO, on both reed & piston ported engines. They seem very filter friendly as well, which in itself is a fuel saver, it not being lost...
by Warkton Tornado No.1
Tue Jun 09, 2020 7:23 pm
Forum: Lambretta Tech
Topic: yamaha conrod questions
Replies: 16
Views: 927

Re: yamaha conrod questions

have looked at various rods,and i think i am going to use the dt125ypvs rod as the big end bearing is 28mm o/d and i can get a rb spec bearing from af that is suitable,could'nt get conformation on what size big end bearings are on the other rods and didn't want to mess about sending them back. the ...
by Warkton Tornado No.1
Tue Jun 09, 2020 11:44 am
Forum: Lambretta Tech
Topic: At Last!
Replies: 7
Views: 878

Re: At Last!

I've been restoring lambrettas for twenty years. Over and over I have heard the refrain 'Jetex are rubbish' The reality is, jetting a carb. is not simple, it requires some time and thought. When it becomes difficult it's easy to blame the Jetex and discard it in a fit of pique. Still, let them keep...
by Warkton Tornado No.1
Sun May 31, 2020 1:39 pm
Forum: Lambretta Tech
Topic: yamaha conrod questions
Replies: 16
Views: 927

Re: yamaha conrod questions

The overall width of the crankshaft can vary, obviously for the better in the case of wider webs with the resultant chance of less twisting. Special wider webs are available from one or two places. To accommodate that, allied to the fact that I can be an outspoken gobsh1te about the disadvantages of...