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| Mikuni HSR 40 carb https://ukbeg.com/forum/viewtopic.php?f=8&t=20731 |
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| Author: | cactus [ 04 Sep 2015 19:39 ] |
| Post subject: | Mikuni HSR 40 carb |
I may have the chance of purchasing a Mikuni HSR 40 carb at a good price, was thinking of fitting it to my '98 S1. Anybody any thoughts on this ? would it be a waste of money and should I give it a miss, am I right in thinking the HSR 42 is the pumper to have ? |
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| Author: | pash [ 04 Sep 2015 21:05 ] |
| Post subject: | Re: Mikuni HSR 40 carb |
Go for the 42 cos you can share the jetting advice of others... If you get the 40 and the jets are a long way off what you need you could be forking out cash that you could have put towards a 42... Just my 2p |
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| Author: | x1glider [ 04 Sep 2015 21:33 ] |
| Post subject: | Re: Mikuni HSR 40 carb |
What is your goal with changing it out? Getting the A/F mix right? Better throttle response? Better starting? More HP? Mikunis have really good tunability and jet changes are about 60 seconds compared to 15 minutes. Easy to get a flat A/F because they don't vent the bowl into the intake stream. Easy starting. throttle response and power are great with the right associated mods, like a race exhaust and a tall Buell oval race air cleaner. Even better with SE536 or similar cams. But truth be told, a CV40 is capable of higher intake velocity on a near stock bike and at low and mids. I've seen way too many stock bikes lose low end power with just a Mikuni carb swap. And the CV40 gives nothing up at 7000 rpms. Drilling the slide vent out to .125-.128" will help the throttle response and starting. Basically a free mod. The only thing else needed that costs money is jets and preferably a new needle with a better taper. No more than 25 quid, if I had to guess. A CV40 will support up to 100HP. Getting a flat A/F is next to impossible but the line is not too bad. But altitude compensation is a great benefit if you travel. |
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| Author: | Graeme1203 [ 04 Sep 2015 23:28 ] |
| Post subject: | Re: Mikuni HSR 40 carb |
On my 97 M2, I run the 40 with a Buell oval race air filter and a carbon V&H SS2R. Fitted the 40 straight out the box and everything has been great. Improvements everywhere. Did think I might have needed to re jet, but did not need to. Just my own experience.. |
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| Author: | cactus [ 04 Sep 2015 23:53 ] |
| Post subject: | Re: Mikuni HSR 40 carb |
Thanks for the replies guys, the bike currently sports a standard carb with a Thunderslide carb kit, a K&N Forcewinder filter and full Buell race exhaust system, oh and it has a Millennium 1250cc big bore kit. I thought as I was getting the 40 at a good price and it's pretty near new I'd give it a go. Still unsure really. 
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| Author: | x1glider [ 05 Sep 2015 06:51 ] |
| Post subject: | Re: Mikuni HSR 40 carb |
cactus wrote: Thanks for the replies guys, the bike currently sports a standard carb with a Thunderslide carb kit, a K&N Forcewinder filter and full Buell race exhaust system, oh and it has a Millennium 1250cc big bore kit. I thought as I was getting the 40 at a good price and it's pretty near new I'd give it a go. Still unsure really. No, don't be unsure. You'll do a bit better with the Mikuni with those goodies. I found the thunderslide to open too quickly and bog down on my RSS1200 and S2. Needed a stiffer spring but I found stretching the spring to be a cheapass get by fix. The real problem on those bikes was the ignition mapping. A SE module for the sportster got me up to 75 HP from 65. |
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| Author: | cactus [ 06 Sep 2015 01:39 ] |
| Post subject: | Re: Mikuni HSR 40 carb |
Once again thanks for the input, have decided to go for it and buy the Mikuni 40. 
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