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post #11 of 55 (permalink) Old Jun 15th, 2019, 7:23 am
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did you replace the needle jets?

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post #12 of 55 (permalink) Old Jun 15th, 2019, 10:19 am Thread Starter
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yes & adjusted float lvl as well-mains, needles & pilots

1991 Ducati 900ss, 1991 Ducati 907ie. 1978 Yamaha SR500, 1979 Yamaha RD400 Daytona Special, 1973 Truimph X-75, 1975 Triumph T-160, 1976 Triumph T140, BMW's too many to list
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post #13 of 55 (permalink) Old Jun 16th, 2019, 7:19 pm
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Remember this is an internet forum so the differences in good driveability may be large as it is a perception. What one calls good another may call poor and both may be right, depends on your standards . I never said a 900 would not run okay at low rpm's just not its happy space, they run so much better a bit higher I do not care to lug the motor.

Gearing does make a large difference as does flywheel mass so different setups can create a different experience. Could a 900ss be set up to work well at 10mph? I am sure of it I would just not find the need to create such a bike myself as I feel there may be better bikes for that application. To each his own as you all know what your riding circumstances are, build to you riding enviroment and you will always be happier.
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post #14 of 55 (permalink) Old Jun 16th, 2019, 9:37 pm
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Ducvet has been doing this stuff a long time as have many of us. Ducatis are not like other twins - they need to be ridden at a little higher RPM and in fact I've read and been told by factory Ducati techs that prolonged low RPM operation (which in a Ducatis case is considered lugging) can cause crank damage. Do yourself a favor and accelerate it up to 4000 RPM and dont shift up if it will drop you below about 3500 to 3750.. I'm not saying they cant be tuned to run below that, I'm just saying that in my experience they shouldn't be.

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post #15 of 55 (permalink) Old Jun 16th, 2019, 10:26 pm
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I can feel just riding the thing it wants to be over 4,000 RPMs at least after 1st and maybe 2nd gear.
It's a singer.

And the song is not about potatoes.
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post #16 of 55 (permalink) Old Jun 17th, 2019, 2:02 am
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Originally Posted by Monster4Lee View Post
I can feel just riding the thing it wants to be over 4,000 RPMs at least after 1st and maybe 2nd gear.
It's a singer.

And the song is not about potatoes.
... puhtatuh puhtatuh puhtatuh puhtatuh puhtatuh puhtatuh .... varrrrooooommmbahhh!!! ..... puhtatuh puhtatuh puhtatuh puhtatuh puhtatuh puhtatuh ....

.... the Harley mating call ....





Never Quit, Die Falling Forward
1996 900 CR. ... LOW ZOOT
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post #17 of 55 (permalink) Old Jun 17th, 2019, 9:01 am Thread Starter
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I agree that they like to run over 4K -That I have no problem with, but to get to 4K you have to go thru 3K lol--and this bike right now stumbles like crazy and just feels like it is loading up -once past 3200 it smooths out nicely under acceleration -but even at say 4K once you hold the throttle at a neutral position just to maintain a given speed it still feels like it is loading up and stumbling--I just have to play with it a bit to get it sorted and find the sweet spot. But with what it doing right now it is just not usable for where I ride

1991 Ducati 900ss, 1991 Ducati 907ie. 1978 Yamaha SR500, 1979 Yamaha RD400 Daytona Special, 1973 Truimph X-75, 1975 Triumph T-160, 1976 Triumph T140, BMW's too many to list
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post #18 of 55 (permalink) Old Jun 17th, 2019, 9:09 am
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My stock carb bike is exactly this, so if you sort it out by all means share!

Edit: to get to this relatively satisfactory performance I went back to the stock airbox lid, put Db killer's in the exhaust on their 2nd quietest setting and fiddled excessively with the needle height and idle enrichment settings. All new needles on a zero mile NIB carb. Now after 1,200 miles on two sets of plugs with perfect looking burning I've accepted the low rpm performance although it does rush through the 2-3krpm's very quickly with a Nichols flywheel and a 41 tooth rear!

Could be a co-incidence but in the last week I've replaced the throttle cables and for a while the "surging, unevenness" at steady throttle was worse until I loosened the return throttle cable. Now while I can still hear and feel the steady throttle roughness below 5k, I can no longer see the variation in the tach. Slightly too tight throttle return cable amplified the unsteady issue.

1991 900SS
1995 900SS SP #746

Last edited by RockAZ; Jun 17th, 2019 at 11:56 am.
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post #19 of 55 (permalink) Old Jun 25th, 2019, 11:06 am Thread Starter
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OK Guys It's done, Had to change the pilot jets back to 37.5 too her out for a test ride and all seems perfect-I just have to get used to this bike but she seems to pull like a freight train and only very minor stumble right off idle under load. But she runs great and I think she looks pretty damn good for a 28 year old bike. The only thing I need to do is get the correct decals for the tank, other then that I'm done-cost of this project including the bike I am into it for $ $2625.00. So I dont think I'm hurt on this at all
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redpato, rwantin and Mojo66 like this.

1991 Ducati 900ss, 1991 Ducati 907ie. 1978 Yamaha SR500, 1979 Yamaha RD400 Daytona Special, 1973 Truimph X-75, 1975 Triumph T-160, 1976 Triumph T140, BMW's too many to list
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post #20 of 55 (permalink) Old Jun 25th, 2019, 11:32 am
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OK Guys It's done .... cost of this project including the bike I am into it for $ $2625.00.
Someone call the cops, you stole that bike!








... $2625.00 .... you suck! ...






Never Quit, Die Falling Forward
1996 900 CR. ... LOW ZOOT
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