billd Posted March 12, 2019 Share Posted March 12, 2019 Posted in air cooled by mistake! So posting again here. Struggling with VM29's on a 1985 GSXR750F, may persevere but is there a better carb that offers smooth idle and good throttle response? Not interested in increased performance and want to run the original air box and filter. Your comments please Quote Link to comment
banoffee Posted March 12, 2019 Share Posted March 12, 2019 Yours must be fucked, I'll give you a fiver for them I've got smooth idle and decent throttle response with mine, and I've junked the airbox. That said, there are likely to be some very worn sets of these carbs out there now. Have you done the basics? I.e. removed, stripped, cleaned and inspected them before putting everything to factory spec? 1 Quote Link to comment
banoffee Posted March 12, 2019 Share Posted March 12, 2019 Also, shout if you haven't got the factory workshop manual Quote Link to comment
billd Posted March 12, 2019 Author Share Posted March 12, 2019 Have done a clean and rebuild but used Chines bits! suspect I need to go through them again 1 Quote Link to comment
Macduff Posted March 12, 2019 Share Posted March 12, 2019 I benched a set of VMs as they refused to work consistently for the starting /idling ,& re-starting when hot jobs you kinda want them to do well. I had swapped the idle jets for new ones and made sure needle jets emulsion tubes were ok but the fekkers refused to play nicely. Bought a 2nd set swapped my new idle jets into those and hey presto its sorted. I suspect my crap set have crud in the carb internals and a proper ultrasonic clean is needed to bring them back. however I'll never want to find out if that's a cure given the pita stripping effort , cost of cleaning and major PITA job of swapping carbs just to find out if they are fixed so I've decided that they are best kept as spare parts for Justin. Quote Link to comment
wsn03 Posted March 12, 2019 Share Posted March 12, 2019 (edited) 5 hours ago, billd said: Posted in air cooled by mistake! So posting again here. Struggling with VM29's on a 1985 GSXR750F, may persevere but is there a better carb that offers smooth idle and good throttle response? Not interested in increased performance and want to run the original air box and filter. Your comments please 1100G Carbs, tried and tested and on mine - smooth as you like. I did this conversion with feedback from an ex TT racer supported by Dynojet who did all the research to achieve a more ride-able power delivery. CVs from an 1100 G, Dynojet Stage 1, original airbox and filters. Had a hole drilled in the slides by a rolling road, seemed to help - its super smooth all round They fit with original rubbers and airbox Edited March 12, 2019 by wsn03 Quote Link to comment
billd Posted March 12, 2019 Author Share Posted March 12, 2019 WSN03, thanks for this. Next questions does anyone have a set?? Will keep the VM29's but would like to try a set of CV's. What are the details of the best ones to get? What year and models of bikes were they fitted to? Thanks boys!! 1 Quote Link to comment
CockneyRick Posted March 12, 2019 Share Posted March 12, 2019 I'm gonna guess that he means BST34SS, but 36's will work too. 38's are silly money & 40's are a pain so i'm told Quote Link to comment
wsn03 Posted March 12, 2019 Share Posted March 12, 2019 (edited) I was told to source off an 1100G...so 1986 - 1987 (im sure the H are the same)? Same dimensions that fit my 750F so no need to change rubbers Edited March 12, 2019 by wsn03 Quote Link to comment
billd Posted March 12, 2019 Author Share Posted March 12, 2019 Thanks for this. Does anyone have a set they would be interested in selling? Quote Link to comment
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