ahell Posted March 17, 2025 Author Share Posted March 17, 2025 Complet spare rear wheel and all new ignition cover. 1 Quote Link to comment Share on other sites More sharing options...
ahell Posted May 24, 2025 Author Share Posted May 24, 2025 (edited) I machined a keihin to 32.30mm to fit it into a remanufactured pipe. The original dellorto is 31mm. It fits without forcing. A quick dremel work to pop the pipe lug and remove the shoulder due to the original 26 diameter. I will test Josep Banyeres' sleeve to adapt the airbox. Otherwise I will install a TRS sleeve. Edited May 25, 2025 by ahell Quote Link to comment Share on other sites More sharing options...
Tr1AL Posted May 26, 2025 Share Posted May 26, 2025 @ahell https://www.agbikes.co.uk/products/jitsie-keihin-carburettor-adaptor-pwk28 Quote Link to comment Share on other sites More sharing options...
ahell Posted May 28, 2025 Author Share Posted May 28, 2025 On 5/26/2025 at 5:23 PM, Tr1AL said: @ahell https://www.agbikes.co.uk/products/jitsie-keihin-carburettor-adaptor-pwk28 There is no more space to fit adaptator like this. Quote Link to comment Share on other sites More sharing options...
ahell Posted June 13, 2025 Author Share Posted June 13, 2025 (edited) Replacing the intake manifold to install the Keihin carburetor requires removing the engine. A screw is inaccessible... A quick stroke with the Dremel to adjust the manifold diameter to the white plastic part that fits into the reed valve. This gave me the opportunity to add an extra 0.5mm base gasket, following J. Banyeres' advice. The Italkit S3 piston and connecting rod are perfect. This was a good opportunity to check the previous work. 45/125 jets. It seems like a good base. New footpegs, more in line with Lampkin's bike. 48 idle jet (adaptable), 3/4 open air screw. I'll try a Keihin 48 jet to see if my adaptable jets are properly calibrated because I thought I'd see more difference between a 45 and a 48. I made three 3.5mm shims to shift the airbox further back because the carburetor and adapter piece assembly are longer than the Dellorto's. The engine is soft at the bottom. I didn't lighten the flywheel on this one. The extension seems better... test on the flat. We'll see on the climbs. Edited December 11, 2025 by ahell 1 Quote Link to comment Share on other sites More sharing options...
ahell Posted October 8, 2025 Author Share Posted October 8, 2025 (edited) Edited December 11, 2025 by ahell Quote Link to comment Share on other sites More sharing options...
ahell Posted October 8, 2025 Author Share Posted October 8, 2025 (edited) keihin settings update 48/120 Rotor -10mm (around -500grs) Alloy footrest Xlight tyres Resurfacing the brake discs Dry weight : 72.9kg (stock : 76.5kg dry) Better handling, brakes, clutch, reving ... this 315R is way easier and fun ! Edited December 19, 2025 by ahell Quote Link to comment Share on other sites More sharing options...
ahell Posted December 9, 2025 Author Share Posted December 9, 2025 (edited) Restoration of a pair of original 4RT 32-spoke wheels. Sandblasting, painting, and polishing of the hubs, SKF bearings. Cleaning and treatment of the spokes. Deglazing of the discs. The weight saving on the front wheel is 700 grams less than 315R wheel! Spokes nipples are aluminum, brake disc, different hub, and four fewer spokes... a significant weight reduction. Edited December 9, 2025 by ahell Quote Link to comment Share on other sites More sharing options...
ahell Posted December 10, 2025 Author Share Posted December 10, 2025 (edited) 32 spokes rear wheel, 750grs less than 36 spokes wheel. Dry weight : 71.5kg (- 5kg) Edited December 19, 2025 by ahell 1 1 Quote Link to comment Share on other sites More sharing options...
ahell Posted December 11, 2025 Author Share Posted December 11, 2025 32x spokes wheels save 1.450kg ! 1 Quote Link to comment Share on other sites More sharing options...
ahell Posted January 27 Author Share Posted January 27 (edited) New Ollé shock save 571grs (showa with stock spring 1820gr. heavy spring 1903grs) New Ti exhaust save 260grs New dry weight: 70.7 kg Edited February 13 by ahell 2 Quote Link to comment Share on other sites More sharing options...
ahell Posted February 22 Author Share Posted February 22 Now, the bike is very nice. Crisp engine sound and light feeling. What a bike ! 1 Quote Link to comment Share on other sites More sharing options...
ahell Posted 1 hour ago Author Share Posted 1 hour ago I'm waiting for a used 4RT top triple clamp for 22mm handlebars. It's lighter and also moves the handlebars forward, which is what I'm looking for to modernize the stock, slightly chopper-like geometry without compromising the look. I have a few other bits and pieces to add to save even more weight (I expect to save around 400-500 grams). I'm going to machine an alloy swingarm pivot. I'll take this opportunity to remove the engine and take off the extra base gasket. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.