Question about 1988 Ducati 851 Strada (Tricolore)

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Ducati 851 tricolor

Flat spot at low revs between 3000-3500 soundd like it is backfiring through the cylnder could it be running too lean no problem at high revs goes like a rocket.

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Yes the backfire is an indication of being lean. Have you checked the valves lately? May be a sign of tight valves although that often cause a rough idle as well. Have you modified the filter system or added a tuned exhaust? Any changes like that can and will cause a change in carburation in which case you may need to fatten up the mid range jetting.

Posted on Dec 08, 2008

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Owners manual


http://www.pdfmotomanual.com/index.php?r=site/page&view=manuales&order=t&key=D&make=1898&lang=ENG

The above link is for the 1991 if that is any good

Have look on Ducati owners forum, there may be a download for a '88 if you are lucky.

Jan 04, 2014 | 1988 Ducati 851 Strada (Tricolore)

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I have a 1991 851 fuel pump needs replacement and filter also .how does fuelpump come out of tank?


remove tank and you should see if its held in by bolts or a retaining lock ring which you rotate to loosen ! more info if my suggestions no help ! P...

Nov 25, 2013 | 1988 Ducati 851 Strada (Tricolore)

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Ducati 851 wiring diagram?


Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Ducati despair not, for a mere $10 you can download another one. For more information about your issue and free valuable downloads that you will need please visit the websites below. Good luck and have a nice day.
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Apr 02, 2013 | 1988 Ducati 851 Strada (Tricolore)

1 Answer

Rebuilding a bike which has bits from here and there. Believe motor to be 1986 GSX750. it runs, carby has fuel in it and seems to be working alrighty, plugs are sparking, but engine backfires a fair bit...


it probably isnt a firing order problem, or it probably wouldnt run

one coil fires 1 & 4 cylnder, the other coil fires 2 & 3 cylnders, as the pick up gets its signal from the crank, it sends a spark to each cylnder on the exhaust stroke as well as the compression stroke, ignition timing also doesent change as it is electronic and cant drift out like when points wear.
a short in the ingnition or kill switch can occasionally cause a backfire
Backfire can also be caused by
lean mixture, dirty carbs, loose carb clamps
leaking inlet or exhaust flanges and gaskets
tight valve clearances, burnt valves

make sure everthing is clean and tight, good air filter and exhaust, check valve clearances ,and give it a compression test, check the valve timing, incase it has been assembled wrong,(they rarely jump a tooth unless the chain and tensioner are completely stuffed)

Mar 03, 2011 | 1986 Suzuki GSX 750 ES

1 Answer

Engine turns over and sparks but wont start, fuel pump is running


Hi, Iknapp and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
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.
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http://www.ducati-upnorth.com/forum/showthread.php?16104-Help-needed-748-doesn-t-want-to-start.
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Nov 30, 2010 | 1988 Ducati 851 Strada (Tricolore)

1 Answer

04 yz 450 backfires and is hard to start when is cold runs better with choke on


Runs better with choke means the mixture is lean,
Has the exhaust been changed.?
Did this problem just begin.?
Check for air leaks on intake manifold.
Clean carb.
Check valve clearances
raise the needle jet one notch
one size up in the main jet.

check one item at a time, and write notes about jetting changes.and improvements
I also run Moreys upper cylnder lube, helps starting hot or cold, and helps stop "cough stopping" with heavy rear brake use

May 20, 2010 | 2004 Yamaha YZ 450 F

2 Answers

Just took my VT750 into shop for backfire issues.


I would probably take it back to the mechanic and ask, the high reving could be loose or cracked inlet manifolds or a clamp left loose, this can cause backfire as well as that cylnder runs lean, other causes of back fire are, lean fuel issues, low ignition voltage, leaks in exhaust gasket or exhaust, incorrect valve clearance, just on downshift try manifolds and exhaust first

Apr 23, 2010 | 2003 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

Fork seals


ZERO air pressure on these forks those air valves are to get rid of any built up pressure in the tubes. I also have a 1990 851 love it! What weight of oil are you running and how much are you putting in?,,

Nov 10, 2008 | 1988 Ducati 851 Strada (Tricolore)

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