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16 Jan 2020
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Forum for Saturno

TOPIC: Keihin

Keihin 1 week 4 days ago #7895

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Hello folks,
I was watching Mikes video on fitting an air filter and found out he has a Keihin FCR39 fitted to his 350 IOM, that got the interest peaked!. Does anyone have any knowledge or experience with fitting this carb?. Specifically, does it help the performance measurably?, is it a stand alone modification or does it only work with valve jobs, modified cam or whatever?. MIke is unlikely to know as it was fitted when he got the bike I think?, Mike?. I love the Saturno, but it has been a bit of a learning curve riding a single again. My Morini's are a totally different experience being twins, even if they are a similar capacity. Vive la difference!
Thanks in advance,
Alan.

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Keihin 1 week 3 days ago #7897

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My Saturno already had the Keihin FCR39 fitted when I bought it. I believe that it was fitted in Japan by a previous owner. I certainly have no complaints about the fueling. it appears to be spot on with no flat spots that I can feel. In regards to cam or valve work I have no idea if anything has been changed from stock as I've never had the head off. However the engine doesn't have the attributes of a performance cam because the power is mostly in the midrange rpm.

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Last edit: by MikeW.

Keihin 6 days 16 hours ago #7903

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Hi Mike,
Thanks for that info. Interesting you should comment on the mid range, which is where I like my power to be, mine doesn't seem to have much go at all, but perhaps I'm expecting too much from it. The inside of the original silencer is shot, so I've sourced an alternative the same length. (mine has the standard 2 into 1 exhaust system), I'll comment if it makes any difference. I've been keeping my eyes peeled for a IOM exhaust, but I think I have more chance of catching the Loch Ness Monster!.
If you are ever cleaning your carb, please do keep a note of your jetting/needle etc and forward it, if I had that I think I might take the plunge and purchase a Keihin. That would be much appreciated, but please don't strip your carb if there's no need to, if it aint broke don't fix it!, and there's not much of our already shortened riding season left here in Scotland anyway.
Cheers and thanks,
Alan.

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Keihin 5 days 3 hours ago #7908

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Hi Alan,

What top speed do you think your Saturno is capable of?

Mike

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Keihin 4 days 18 hours ago #7909

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Hi Mike,
I would be guessing because I'm not that fast a rider. 90MPH?. I have standard gearing on mine..
I weigh around 75KG with all my gear on so I'm probably around the weight of the riders the bike was designed for? My speedo is in KPH but I have a little mechanical gearbox on the back of the speedo with a 1.62 to 1 ratio so the number you read is in MPH. I think it's pretty accurate. But it's easy to remove, so I could check it in KPH.
I would love to go and try to find out, but we have very strong winds and horizontal rain, not cold though, probably almost into double figures, HA!. I think the normal riding season is over here.
Alan.

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Keihin 4 days 18 hours ago #7910

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I've had mine to just over 140 kph which is about 90mph. The bike still has a bit in reserve but not enough to make to 100mph I reckon. I am curious though how much difference if any the Keihin carburetor and dual IOM exhausts make without any other engine mods.

Whilst it can get a bit stormy in winter here in Melbourne we can pretty much ride all year round. If anything it can get too hot in the middle of summer :)

Mike

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