Search found 134 matches

by chris2470
Sat Dec 01, 2018 8:51 am
Forum: Lambretta Tech
Topic: PKW 24mm which baseline jets & needle ?
Replies: 10
Views: 1008

Re: PKW 24mm which baseline jets & needle ?

There is a lot of good information regarding the set up of PWK carbs here: http://www.duncanracing.com/TechCenter/ ... g-2015.pdf Baseline suggestions look to be ball park, JJK-3 or 2nd clip, 120 & 38. The main issue I've seen is fuel flow when WOT, there is a small nipple in the bottom of the float...
by chris2470
Sat Sep 01, 2018 8:27 am
Forum: Lambretta Tech
Topic: Carb Spitback Help??? its getting to me now.
Replies: 41
Views: 7928

Re: Carb Spitback Help??? its getting to me now.

If the inlet timing is large >145° it will spit back at low revs, have you taken any readings to see exactly what you inlet timing is, it would be good to know. Also the Muggy has a boost port feed through a hole in it's piston at 12'O'clock, good idea check this is not protruding into the inlet a B...
by chris2470
Sat Sep 01, 2018 7:36 am
Forum: Lambretta Tech
Topic: whats the verdict on 24mm PWK carbs ?
Replies: 25
Views: 1874

Re: whats the verdict on 24mm PWK carbs ?

There is a lot of good information regarding PWK carbs here: http://www.duncanracing.com/TechCenter/KeihinCarbJetting-2015.pdf The main issue I've seen is fuel flow when WOT, there is a small nipple in the bottom of the float bowl, to stop the float bottoming out , this must be ground flat, or cut a...
by chris2470
Fri Aug 24, 2018 8:44 am
Forum: Lambretta Tech
Topic: Advice needed on new Top End Spec
Replies: 7
Views: 921

Advice needed on new Top End Spec

Hiya, I'm looking for some advice on the way to go with a top end rebuild, I'm looking for 23-25hp with good torque. Currently I'm running a Rapido race that was purchased second hand as it had a seize, this was re-bored to 70.4, and fitted a new piston (Indian jobby with Asso rings) along with a LT...
by chris2470
Tue Sep 27, 2016 7:11 am
Forum: Lambretta Tech
Topic: Keihin carb problem
Replies: 5
Views: 1019

Re: Keihin carb problem

I had a similar issue with a PWK when it was fitted with a clear plastic bowl, it warped over time on the back edge and would not seal. Threw it away & fitted an ally one all is good and has been for a few years now.
by chris2470
Sat Apr 25, 2015 1:53 pm
Forum: Lambretta Tech
Topic: Granturismo GT200 and PWK28
Replies: 2
Views: 698

Re: Granturismo GT200 and PWK28

I have a rapido 225 with reed fitted, running a pwk30.
Seems to run OK on a 40 pilot 140 main, jjk 2nd clip. Air screw half turn out.
by chris2470
Thu Apr 23, 2015 7:20 pm
Forum: Lambretta Tech
Topic: Starts but won't go
Replies: 14
Views: 2386

Re: Starts but won't go

by chris2470
Thu Apr 23, 2015 4:51 pm
Forum: Lambretta Tech
Topic: Starts but won't go
Replies: 14
Views: 2386

Re: Starts but won't go

I've see exactly this on a VaspaT5, it was a faulty stator pick up unit.
by chris2470
Wed Feb 25, 2015 7:47 am
Forum: Lambretta Tech
Topic: Stainless v Mild Steel Exhausts
Replies: 26
Views: 3976

Re: Stainless v Mild Steel Exhausts

Thank you for the feedback its much appreciated.
it seems the decision is most likely to be a reliability or an aesthetic one rather then down to outright performance, thank you.
by chris2470
Mon Feb 23, 2015 7:51 pm
Forum: Lambretta Tech
Topic: Stainless v Mild Steel Exhausts
Replies: 26
Views: 3976

Stainless v Mild Steel Exhausts

I have a question that I would like to ask if I may, as I'm looking to get a new pipe this spring. Will there be, or is there any measurable difference in performance terms, when mounted on the same 2 stroke motor, two of the same exhausts design, one made of stainless steel & the other made of mild...