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Saturno Keihin

Posted: Fri Nov 06, 2020 6:59 pm
by Dode
Hello Folks
Does anyone have any experience if fitting a Keihin FCR carb to a Saturno?. Specifically an FCR39 to a 350?.
Thanks,
Alan.

Re: Saturno Keihin

Posted: Fri Nov 06, 2020 9:44 pm
by garagien
Hi Alan,

350 cc is in Germany less common. FCR41 to 560 cc yes, but you cannot compare.

Regards
HP

Re: Saturno Keihin

Posted: Sat Nov 07, 2020 12:18 pm
by Dode
Hi Garagien,
I thought as much. All of the photo's of 350's with FCR39's fitted have been from Japan, or of Japanese bikes in Australia and NZ. Not to worry, I may experiment with jetting on the standard carb. I read with great interest your notes on the differences between German and Italian specification 500's, I may have a play around. My bike is running well, I think over 90%, so it would mean fine tuning, perhaps one step up or down in pilot or main jet to experiment. I have a K&N filter fitted, that may have some effect. If I see a decent FCR for sale I might just take the plunge and buy it then try to set up the jetting.
I know you can buy replica FCR's, made in China I think, but I'm rather concerned about the quality.
The plug colour was good, but now that I have a thermostat fitted and it's running at the correct temperature that might have changed, so I'll check.
There's always something to do!.
Thanks for your reply.
Alan.

Re: Saturno Keihin

Posted: Wed Dec 30, 2020 4:49 am
by 500IOM
Hi Alan,

A little off topic, but may I ask where you got your thermostat? My 500 IOM has no thermostat element fitted and I've been unable to source one.

I purchased my 500 IOM from a friend here in Perth who has connections in Japan and has imported quite a few bikes including a few Saturnos. MIne was one of these, and was running with an FCR39 previously but now with the original PHM 40 Dellorto again. I can ask my friend how he had it set up, although it will be for 500 of course and not 350, and also the bike has a 12.5:1 piston.

Cheers, Lex

Re: Saturno Keihin

Posted: Wed Dec 30, 2020 9:27 am
by garagien
Alan,

mind the Chinese ones, even better to try an original used one.
My FCR41 with 560 cc for race track use runs with MJ 160 and IJ 55 just to give you an idea. But this is only the half truth. I did not noted the needle typ and other internals. As per my Keihin handbook there are 200 needles available as I remember. So better to ask somebody who has some experiance with. For a stock 350 I assume for MJ 153-155 and IJ 50-53.
Is there a "legal" road chance in AU to test max speed? To check for engine/carb behaviour in upper speed ranges?

Regards,
HP

Re: Saturno Keihin

Posted: Tue Jan 12, 2021 9:14 pm
by Dode
Hi Folks,
Please excuse me for not replying sooner.
I got my thermostat from Bob Wright, and even then it was a used one, all he had. I have seen some complete thermostat housings, with thermostat in place on the Australian Ebay?, worth a look there?.
Thanks for the information on the Keihin Garagien.
I have noticed that although my 350 is running well with the original carb, to go to wide open throttle is just a waste of time, it makes more noise but doesn't go any faster! When I got my bike, it had a small pod filter fitted, along with a 140 main jet, the original is 128 I believe, I wonder if it may be worth fitting the 140 back. I now have a K&N large pod style filter. When we come out of lockdown it will probably be springtime!. I'll ride it with WOT and slowly pull the choke on, if it goes better then there is my answer perhaps. Of course, I may be expecting too much from my little engine, but it does go remarkably well for a 350CC, even without wide open throttle.
Alan

Re: Saturno Keihin

Posted: Thu Jan 14, 2021 4:48 pm
by garagien
WOT ?
World of Tanks? (Internet game)
Ethiopian food style? (see Wikipedia)
Wide open Throttle? (my own interpretation about)
giggle
Please give us tutoring.

Yes, the little 350th are little revving wonder but upward runs out of breath. Do you think about to lath down the rotating weight and to try different cams? You cant increase valves sizes too much because of small bore. Girardoni/Italy once offered 100 mm bore kits for the short strokes to bring up to 534 cc. In combination with a modified Saturno head you have still a rev beast but with extra power. I once modified two 350 cc engines about. One I was using in my street Saturno, the other one for race track use. But my basic philosophy is keep as original as possible, the 350 and 500 cc BI4 engine are the best ones. If you modify, you will loose life time (and a lot of money).

For the water thermostat there are two different versions available. You cannot mix the parts as far I can remember. Did you check if it will open using a warm water pot in the kitchen. See my vid in Youtube about.

Redgards
HP

Re: Saturno Keihin

Posted: Sat Jan 16, 2021 3:12 pm
by Dode
Hi Garagien,
Yes, you were correct, WOT, Wide Open Throttle.
I'm actually very happy with the way my little 350 rides, it's an involving fun bike. It's so difficult to find any information about them, and I just wanted to make sure mine was running at as close to optimum performance as I could get it.
I think for me 350cc or thereabouts is a perfect capacity, I like the "feeling" of going fast, especially through the corners, whether or not I actually am going fast, I'm not so concerned about. The grin factor is important for me.
I agree with your philosophy, and your statement about the engine perhaps not lasting so long is accurate, I would rather have a reliable engine.
Thanks,
Alan.

Re: Saturno Keihin

Posted: Sat Jan 16, 2021 3:16 pm
by garagien
*danke* keep on running the beast.
I´m with you
HP

Re: Saturno Keihin

Posted: Sat Jan 16, 2021 7:09 pm
by garagien
https://www.ebay.de/itm/GILERA-SATURNO- ... SwNTNcE1AR

Have a look too.....above link.
Maybe another start into Saturno loving.

HP giggle