V35 imola will not start |
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Thetar
Falcone Joined: 10 Aug 2018 Location: Ireland Status: Offline Points: 42 |
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Running but not properly. Never catching. Died if I touched the throttle. Stopped after a few seconds anyway. Could see exhaust coming from both pipes though. Can't get it to run at all now.
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Ok now I'm questioning the condition of these carbs. I'll have take them apart again and check the oring. This bike is a bit if a Frankenstein. V50 carbs. Imola engine. Delinked brakes. Wiring shambles. Never worked with dellortos before so not sure of how they should go together. Maybe it's worth buying a set of correct vhbs from eBay? It might save me in the long run in psychiatry bills. It will be the jet sizes that may prove difficult, plus there are `o` rings fitted to the two adjusting screws which often get left behind in the orifices thus you may have boiled them into submission CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Simmoto
Senior Member Joined: 29 Jul 2017 Location: Aberdeenshire Status: Offline Points: 261 |
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Definitely points? I thiught Imolas had Bosch electronic ignition; at least mine does LOL. The Bosch is tricky to set up and can affect how the bike runs. A lot!
Cheers
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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According to my Guzzi manual, the V35 II, V35 Imola, V50 III and V50 Monza have twin points. Maybe a few early Imolas had the Bosch ignition. When you say V50 carbs, which ones? The Imola had 26mm carbs. The early V50 had 24mm, and the V50 III had 28mm.
Edited by Brian UK - 29 Dec 2018 at 08:36 |
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Brian.
Better 5 minutes late in this world than years early in the next. |
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LarsW
Falcone Joined: 24 Nov 2015 Location: Norway Status: Offline Points: 83 |
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What about idle adjusting screws? If throttles are adjusted too high (also if the throttle cables are restricting) there will not be enough vacuum to draw fuel from the float-chambers....
Ciao, aLrs W Norway |
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Thetar
Falcone Joined: 10 Aug 2018 Location: Ireland Status: Offline Points: 42 |
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28mm carbs. Definitely points. Yes these carbs are oversized. But I'm getting nothing now, no firing whatsoever. Even if carbs badly set up a squirt of starter fluid should have it firing for a few seconds. You can get an engine to run off a PVC pipe if you keep squirting starter fluid.
Need to go back to the points and double-check.
Edited by Thetar - 29 Dec 2018 at 10:56 |
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redmunk
Senior Member Joined: 31 Oct 2017 Location: London Status: Offline Points: 112 |
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Have you checked the valve clearance? Too tight valves allowing gas to leak by would cause this. As soon as any heat gets into the stem and it expands, it’ll get worse, stopping the engine.
My Imola engine has VHBZ 26 carbs so yours are the right size.
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Jets and the galleries in the carbs could be partially clogged with hard deposits. These come with modern petrol. Guess how I know. I ended up forkting out for all new jets for my big block 850, as a case of making sure, although it was a runner. Nevertheless the difference was almost magical. 2. Points. Assuming timing is correct (is it?) altho the contact faces can look good, the plastic heels that ride on the cam can wear out. Then the contacts don't open cleanly, becasue the wear is irregular, resulting in misfires. Again, guess how I know. 3. Not mentioned yet (?), contact breakers. According to several accounts, here and elsewhere, new ones can be badly made and fail, or are just bad, causing non-sparks. 4. Coils are good? HT leads et? HTH |
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"Chicken nuggets don't dance on a Tuesday."
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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As it's a v twin, the firing points aren't 180 degrees apart..... 90 and 270 depending which way you look at it.
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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If it's electrical you should have wet plugs. Just a thought.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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And since it has points, there won't be a wasted spark.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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rapheal
Senior Member Joined: 13 Nov 2014 Location: west country Status: Offline Points: 573 |
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You could try something my late uncle used to do, ( he was an old fashioned motorcycle engineer)
remove the exhaust pipes, then try running and seeing what colour the flames are |
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Thetar
Falcone Joined: 10 Aug 2018 Location: Ireland Status: Offline Points: 42 |
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its not running at all now. Next step is to go back to ignition timing. I'll report back!
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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If it was running, however badly, I would suggest the timing isn't wildly out. I'd go along with Mike that some of the passages in the carbs may be blocked. I can't remember if you've tried a squirt of easystart......
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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GuzziTim
Guzzino Joined: 02 May 2015 Location: Shepshed Status: Offline Points: 5 |
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is it points or electronic ignition?
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