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ducatipaso.org • View topic - Crankshaft Turning Tool
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 Post subject: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 4:53 am 
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Joined: Sun Oct 24, 2010 6:55 am
Posts: 53
Location: Prospect, OH, USA
model: 750 Paso
year: 1987
I guess I need a crankshaft turning tool. Can anyone tell me if the ones for the current models are the same as my 1988 750? If not where do I get one? Or maybe I dont even need a special tool for mine?

I need to adjust the timing. I did find the belts through info here. After the timing is set I may need to do some carb work. it's a weber. Yay :banghead:

Any help before a long search of info on the carb would be great.

Anyone know where to get decals for a 750 Paso? It's being repainted after it's running well.


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 5:28 am 
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Joined: Thu Aug 28, 2008 9:48 am
Posts: 102
Location: Smithsburg, MD
model: 750 Paso
year: 1987

Made my decals, near Pittsburg if I remember correctly. Pictures -

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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 7:36 am 
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Joined: Sun Oct 24, 2010 6:55 am
Posts: 53
Location: Prospect, OH, USA
model: 750 Paso
year: 1987


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 7:41 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5494
Location: southern Germany
model: 750 Paso
year: 1987
on the last pages of the cam timing document there´s a drawing of the crankshaft turning tool if you know a shop that can make it for you. http://www.box.net/shared/76966gjgn8

Otherwise there´s ebay. Here`s the whole set
http://cgi.ebay.com/DUCATI-BEVEL-BELT-D ... 19c489f28f

you can find the decals on ebay, too
http://cgi.ebay.com/Ducati-750-Paso-dec ... 5198ac5bb8

G.


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 10:28 am 
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Joined: Thu Oct 22, 2009 10:38 am
Posts: 247
Location: Mildura ,Australia
model: 750 Paso
year: 1986
Hi Chasaduc, The factory has run a couple of different jetting setups in the webers on the 750.
Before the middle of 1987 the jetting was 142 mains,160 air correctors and 60 idles.This would have been very rich down low with th 60 idles and stumbled around the 2500 - 3000 rpm mark.Today I ran 145,160,55 as an experiment and there was a tendency to go a bit lean around the middle of the rev range.The 60 idles would have fixed this problem,so this jetting was probably fine through the rest of the rev range aside from the rich stumble.
After the middle of 1987 the jetting was 150 mains,170 air correctors and 57 idles.They reduced the size of the idles,IMHO to alleviate the rich stumble,but this would have leaned the middle of the rev range, so they increased the main jets by almost two full sizes,while increasing the air correctors by less than one size,this would have richened the whole upper power band up especially wide open throttle.
I am currently running 150 mains,160 air correctors and 55 idles,this is richer than factory across the middle and top end of the rev range,but will hopefully allow me to drop down to a 54 or 53 idle as I still have a rich stumble condition at 2500 - 3000 (if I open the throttle quickly the accelerator pump shot causes the problem).A 50 idle creates a lean condition at 5000-5500 rpm,which is difficult to get rid of so is too small.
The current jetting is perfect for my bike when cold,but when hot is just a tiny bit rich.If I can't get rid of the rich stumble by reducing the idles,I will stick with this jetting and play with float levels,accelerator pump jets and emulsion tubes to fine tune it. I think this would be a good starting point for you if you are not happy with how your weber is running,but it is hard to say without knowing your climate and altitude.Idle jets are only about $3.00 each on ebay so buying a half dozen to play with won't break the bank and they are very easy to change without dismantling the carby.The jets are available in single increments and it is amazing the difference 4 or 5 sizes of idle jet can make to the running of your bike,when you start to get close to a correct size.

In my experience using a lamda meter as a guide,a stumble down low (2500 - 3000) is a rich problem,remedied by reducing idle jet size and a stumble up higher (4500-5500) is a lean condition,that can be fixed by increasing idle jet size,the trick I think is finding the balance point,which makes the bike most rideable and then fine tuning the other variables(main jet,air correctors float levels etc.)
Hope this wasn't too confusing :wacko: and is of some help to you. Jay.


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 10:35 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
the tool in the us can be had at bevel heaven, california cycle works or desmotimes for about 70 bucks

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88 750
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92 907ie


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Thu Apr 07, 2011 1:14 pm 
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Joined: Thu Aug 28, 2008 9:48 am
Posts: 102
Location: Smithsburg, MD
model: 750 Paso
year: 1987

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08 HYM 1100S
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89 KLR650
87 750 Paso LTD
64 125 Bronco


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Fri Apr 08, 2011 11:45 am 
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Joined: Sun Oct 24, 2010 6:55 am
Posts: 53
Location: Prospect, OH, USA
model: 750 Paso
year: 1987


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Fri Apr 08, 2011 3:45 pm 
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Joined: Sun Nov 07, 2010 8:25 pm
Posts: 24
Location: Spain
model: 750 Paso
year: 1988
Good news!!!!! You don't really need a turning tool to perform this job on ANY Ducati. I own three, an F1, a Paso 750 and a MTS 1000 I do all their maintenance work..... and a bit more!

The timing pulleys marks are there for the Horizontal cylinder ONLY. You just need to find the right position for the vertical one. As timing pulleys turn at half the speed (and therefore turn 360º for every 720º the crankshaf does, being a 4 stroke engine) and ignition timingbetween both cylinders is separated by 270º (360º - 90º), the mark you need you make on the pulleys is 135º off the existing mark. Yes but.... clockwise or anticlockwise? well, it's clockwise the existing marks, but it's really easy to check knowing what you're looking for:

1- Remove spark plugs.
2- engage 1st gear.
3- turn timing pulleys 135º, no matter the direction.
4- insert anscrewdriver through the vertical cylinder spark plug hole. If the piston is right there, it's in TDC (both valves closed, ther's another TDC in a 4 stroke engine) and therefore in the right position. If not, it's 135º in the other direction from the timing marks.

Once this done, next time you just need to remove spark plugs, engage 1st and turn the rear wheel by hand to take timign pulleys to the right position. Easy & cheap.


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Sat Apr 09, 2011 2:35 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
to my knowledge the same tool fits all 2 valve belt drive Ducati engines

I made my own from parts I had laying around


If you want to do your cam timing properly and accurately the tool will make it much simpler and more accurate than the factory markings which can be off by as much as 8 degrees, true for any engine
Also when making final measurements once true tdc is located you must rotate the engine in its natural direction to be accurate

_________________
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Sat Apr 09, 2011 7:13 am 
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Joined: Sun Oct 24, 2010 6:55 am
Posts: 53
Location: Prospect, OH, USA
model: 750 Paso
year: 1987
Speaking of just turning the rear tire (that's a great idea by the way!) What is the trick on getting this up on its center stand?


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Sat Apr 09, 2011 7:41 am 
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Joined: Sun Oct 24, 2010 6:55 am
Posts: 53
Location: Prospect, OH, USA
model: 750 Paso
year: 1987


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Sat Apr 09, 2011 12:14 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
It is the collection of tools required and their setup that will provide the accuracy required.
I simply meant the crankshaft turning tool will make it much easier to do the entire process,. A lot easier to do, especially if you have never done this sort of thing before.
there are of course "many ways to skin a cat"
turning the rear tire will work
sticking a bolt with a jam nut in the end of the crank will also work,you could even skip the jam nut and do the entire job with nothing but a couple of wrenches and a pencil. Hell skip the pencil and just eyeball TDC.
Or you could take it to your local dealer and let them do it for what ever they charge :beer: :beer:
It's all good :beer:

Also relying on the factory marks works,it is just not the best way if you are looking to fix a perceived problem with the way the bike runs.

If you need more info, Kens procedure is an excellent place to start and will cost you no more than the time it takes to get it and read it :thumbup:

_________________
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Sat Apr 09, 2011 12:31 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990

_________________
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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 Post subject: Re: Crankshaft Turning Tool
PostPosted: Sun Apr 10, 2011 5:49 am 
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Joined: Sun Oct 24, 2010 6:55 am
Posts: 53
Location: Prospect, OH, USA
model: 750 Paso
year: 1987


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