Search found 540 matches

by Rich_T
Mon May 15, 2017 4:59 pm
Forum: Lambretta Tech
Topic: Help getting the GT186 compression right after last years issue!?
Replies: 9
Views: 3371

Re: Help getting the GT186 compression right after last years issue!?

Does the calculator you have used need to have a deck height distance?
by Rich_T
Mon May 15, 2017 4:55 pm
Forum: Lambretta Tech
Topic: Help getting the GT186 compression right after last years issue!?
Replies: 9
Views: 3371

Re: Help getting the GT186 compression right after last years issue!?

Hi Donnie, I sent you a PM about this when I saw your post on LCGB. Your post says the measurements are without gaskets. If you add a gasket either side of the base packer you will gain 0.8mm to the squish and head volume. This will give you 1.53mm which is bang in the money and the squish volume wi...
by Rich_T
Fri Apr 21, 2017 1:49 pm
Forum: Lambretta Tech
Topic: gt200 ?
Replies: 21
Views: 7448

Re: gt200 ?

PM sent
by Rich_T
Fri Apr 21, 2017 10:04 am
Forum: Lambretta Tech
Topic: gt200 ?
Replies: 21
Views: 7448

Re: gt200 ?

Ticks over ok , first or second kit 1 base gasket then packed then another base gasket , no head gasket all sealed with threebond, gt head , new carb, all running in has been done around town ECT, using a n3c plug , at time of nip up I was doing 50 behind a van and just eased of the throttle , stev...
by Rich_T
Thu Apr 20, 2017 9:50 pm
Forum: Lambretta Tech
Topic: gt200 ?
Replies: 21
Views: 7448

Re: gt200 ?

The main is a bit weak but even so if you are still running it the plug should not be grey by any stretch. Does the engine tick-over nice and start first or second kick from hot and cold? Are you using a porcupine head and a copper head gasket, base packer and gaskets? How many of the packers and ga...
by Rich_T
Thu Apr 20, 2017 9:59 am
Forum: Lambretta Tech
Topic: gt200 ?
Replies: 21
Views: 7448

Re: gt200 ?

PM me the engine specification, and the history and we'll go from there. Like Eden says, the Main is normally 135.
by Rich_T
Wed Apr 19, 2017 8:25 pm
Forum: Lambretta Tech
Topic: gt200 ?
Replies: 21
Views: 7448

Re: gt200 ?

With box pipes 18-19 degrees. With expansions 17-18 depending on rev range.
by Rich_T
Wed Apr 05, 2017 5:30 pm
Forum: Lambretta Tech
Topic: Tip for getting frozen engine case studs out.
Replies: 8
Views: 2890

Re: Tip for getting frozen engine case studs out.

Alternatively, for studs that have sheered off flush or taps that have broken off inside deep holes, I've been using spark erosion. When machining some of the GT cases I have broken M6 taps on the CNC. The tap snapped in the M6 seal plate hole in the crank case. You'd have no chance to get this out ...
by Rich_T
Thu Mar 23, 2017 11:10 pm
Forum: Lambretta Tech
Topic: Changing to a 60mm crank
Replies: 11
Views: 8444

Re: Changing to a 60mm crank

OK, in terms of GT186 kits these are the influences
58/107 exhaust 173 transfer 124 (no head gasket, standard build)
60/107 exhaust 174.6 transfer 127.1 (1mm head gasket only)
60/110 exhaust 174.1 transfer 126.7 (3mm base gasket & 1mm head gasket
by Rich_T
Thu Mar 23, 2017 9:24 pm
Forum: Lambretta Tech
Topic: Changing to a 60mm crank
Replies: 11
Views: 8444

Re: Changing to a 60mm crank

Increasing the stroke will increase the port durations if you add a 1mm base packer but you may run into problems with the piston skirt bottoming out. If you run a longer rod this has the effect or reducing the timings, this is why a 60 stroke /110 rod combination works really well. The 110 rod also...