Question about 1976 Ducati 860 GTS

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I have a 1978 ducati 900 gts which I have just rebuilt Its all set up right cam timing,ignition timing,carbs balanced etc it runs great above 2500 rpm but it has a intermitant missfire/chuff below 2500 but idles ok??

Posted by Anonymous on

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  • Ducati Master
  • 40,760 Answers

Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have nice a day.
Club Bevel Heaven
DOWNLOAD 1976 Ducati 860 Gts
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Ducati 860GTS

Posted on Feb 16, 2016

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 200 Answers

SOURCE: 2000 Ducati 900ss idle speed seems high

That's waaay too high ! Very hard on the tranny when you click it into gear at that rpm, find your idle screw and turn it down, should not be over
1,000 at warm idle, info should be in owners manual...good luck to you friend...Tim

Posted on May 14, 2009

  • 1 Answer

SOURCE: Fitting Ducati 748 clutch slave cylinder to square case 900 1978

There is an hydraulic clutch replacement for the cable on a squarecase engine. No mods needed, just bolt on from memory. Fits a clutch master cylinder from a beltdrive Supersport and a custom slave inside the housing where the normal lever goes.
I will need to find the contact info for the bloke who does them though as it has been a while since I got the info myself.
Contact me at ozradecal@gmail.com

Posted on Aug 04, 2009

  • 20 Answers

SOURCE: loss of power above 3000 rpm

You have a fuel delivery problem. Open the gas cap on the bike & try. This will prove if a vacuum is happening inside the tank (plugged vent). Check fuel filter. Check fuel pump. Check fuel pressure regulator.

Posted on Aug 09, 2009

sisadsl
  • 1508 Answers

SOURCE: Ducati 900 SS oil warning light remaining on yet

could be the oil pressure sender, try a new one.
screw a pressure gauge into the sender hole and make sure it has pressure. dont run it long with the light on

Posted on Apr 05, 2010

  • 6 Answers

SOURCE: puller needed , as below

these pullers are available at www.desmo.net or in Australia from metalbits@optusnet.com.au

Posted on May 07, 2010

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Hi, Had the engine out for rebuild on a 1980 900SS. First no spark in front cyl. Cleaned all the connectors in the ignition wiring and had a spark. Now it runs but often backfires at low rpm (2000)


Hi, Fred and the usual suspects are:
1. A severely drained battery.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
95 900ss backfires then shuts off Ducati ms The Ultimate Ducati Forum
Help with missing backfire like issue
Free Ducati Motorcycle Service Manuals for download
Ducati OEM Parts Fiche Lookup and Online Ordering
Ducati Maintenance

Feb 24, 2014 | 1978 Ducati 900 SS

1 Answer

Backfire carb


Hi, Anonymous and the usual suspects are:
1. A severely drained battery.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
Backfiring
Backfire through Intake
DOWNLOAD 1978 Ducati 900 Sd Darmah
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Ducati Maintenance

Jan 25, 2014 | 1978 Ducati 900 SD Darmah

1 Answer

98 900FE starts but idles rough, pops & burps, stalls with open throttle. Noticed in dark garage that rear pipe glows cherry red!


Hi, Doug primary suspect for glowing cherry red exhaust is retarded ignition or cam timing for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.1130cc.com/forums/archive/index.php/t-110936.html
http://www.ducati-upnorth.com/forum/showthread.php?20256-996-rear-exhaust-pipe-RED-hot
Free Ducati Motorcycle Service Manuals for download
Ducati OEM Parts Fiche Lookup and Online Ordering
Ducati Maintenance

Aug 29, 2012 | 1998 Ducati 900 SS

1 Answer

350 chevy with elebrook carb will not idle below 2500 can you help? just rebuilt this carb. every thing went good all settings done by the book. very clean inside all jets cleaned or replaced. re check...


Manually operate the choke mechanism and watch to make sure it fully releases. Quite often mistakes can occur when putting the pieces back together and it won't fully release off fast idle.Are you absolutely positive that you didn't forget an o- ring or ball when you put the carb back together? Is there any chance there is a gasket upside down? Could the power valve be in wrong? These types of things could create that problem, there is too much gas going through your idle circuit.What happens when you turn in the idle screws? Are you sure about the timing? I don't have specs for a 1/2 ton but all the specs in my Chilton give me 6 degrees in California and 8 degrees everywhere else. These numbers cover all models of cars for a 1978 350. Hope this helps.

Oct 24, 2010 | 1978 Chevrolet C1500

1 Answer

Timing and carby tuning on a 900 ducati


Check the timing by removing the covers and bringing the engine around by hand to the marks at the top of the cams, then peek through the glass, it should be on it's mark. Or better yet, it has to be on it's mark. The carbs have no adj, except for the amount of air going in. What happened to the bike to make it change? Move to a different elevation? Change air filter? Change exhaust? In order to change the way it runs, you will need to jet it. Does it have Mikunis? Get a kit from Dyno-tune, they work great, and they are adj. You can find them on Ebay, I tried the factory setting jets, didn't work, got the dyno-tune kit, worked great. And, depending on the milage, when were the valves done last? That could be the problem right there.

May 16, 2010 | Ducati 900 SD Darmah Motorcycles

2 Answers

High idle on start up with choke off.


This sounds like an air leak is making the fuel/air mixture too lean. Any air leaks between the carb and the head will lean the mixture. Old, hard and cracked rubber manifold parts are the usual culprits. Old gaskets and "O" ring seals can leak air also. A bad head gasket seal happens at times also, as does an exhaust valve not fully seating. Air leaks are the idle speed problem.

A different problem is likely present in the carbs and that is what is causing the rich fuel smell. The carbs must be balanced. Example > If three of four carbs are perfectly balanced and one carb is not, then the 3 are "driving" the 4th carb. This will cause gas to spit into the air cleaner from the "bad" carb and can cause a backfire or two. Special vacuum gauges are needed to balance the carbs. Also be aware the carbs must be scycronizsed as well. The slides on all four carbs must lift at exactly the same time when the throttle is cracked.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

I don't get paid for my answers but I do take pride in them, and I am only trying to help. So if you will, > > A “very helpful” rating for these answers? Thanks!

Jun 14, 2009 | 1977 Suzuki GS 750

1 Answer

I have a 1978 900gts and am trying to rewire it. 1. 2 wires from left side case on the bottom taped off. 2 wher is the nuatral switch


You should find the manual and wiring diagrams here. Hope it helps you...rate if its good, if it does not help get back to me and I will try something else....Thanks.

http://www.ducatimeccanica.com/860_workshop_manual/index.htm

Mar 24, 2009 | 1978 Ducati 900 GTS

1 Answer

Cam timing


In our perennial quest for HP and torque the topic of cam timing seems to be missing from the threads thus far posted. Yet cam timing can have a significant effect on overall engine performance and the mix between HP and torque. Since the HM has only a single cam per cylinder there isn’t anything we can due to vary the overlap for any given cam, but there is certainly some range of adjustability on how the overall cam timing is set by cylinder. With the stock cams, the timing specs for both cylinders are as follows at 1 mm valve clearance Intake Opening 15° B.T.D.C. Closing 65° A.B.D.C. Exhaust Opening 62° B.B.D.C. Closing 19° A.T.D.C. (Anyone have the specs of for the DP cams?) Certainly degreeing in the cams to spec is a good starting point, but my real question is how might HP and torque be impacted by advancing or retarding cam timing? There’s lots of information on how to degree a cam and people have been doing so since the old flat-head hot rod days, but information on how changing cam timing in and by itself affects overall performance and/or the mix between HP and torque (perhaps held as closely guarded trade secrets by the cam manufacturers +/or tuners).,,,

Nov 10, 2008 | 1978 Ducati 900 GTS

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