General Category > General Discussion
Newbe with v75 problem
simj26:
Hi there. I'm having a bit of a problem with an ol' guzzi. It's a '92 V75 ex Italian police bike acquired as a non runner that'd been stood for a while. The problem is that it will only run on the left cylinder. I've done all the usual stuff...cleaned and set up the carbs, swapped all the ignition components over to the non running side (no improvement) even swapped the carbs over (no improvement). Removed the head on the non running cylinder to check the valves...they weren't too bad (re ground them anyway) piston n bores are good and compression is good. The one big thing is that the valve timing seems to be out. runs fine on the left cylinder but just backfires on the right. There does seem to be some back pressure through the inlet port at one point during the cycle....which does give the impression the valve timing is out.......but the left cylinder is fine?
Anyone have any ideas as to the problem......I can't see how you can have the valve timing out on one side but not the other when there's only a single cam? I haven't opened the front casing to check the cam chain or guide yet.
Any help would be much appreciated. ???
oldbike54:
Could be a bent pushrod , or maybe a flat cam lobe . Yes , a bit of a puzzler .
Dusty
simj26:
Checked the pushrods...they're fine. Would one cam lobe deteriorate that badly...on one side only? Must admit,this one is baffling me! ???
Chuck in Indiana:
--- Quote from: simj26 on December 11, 2014, 02:43:09 PM ---Checked the pushrods...they're fine. Would one cam lobe deteriorate that badly...on one side only? Must admit,this one is baffling me! ???
--- End quote ---
Sure can, although it is extremely rare on a Guzzi.. it's certainly easy enough to check, just turn it through and watch the valve movement. Report back.
oldbike54:
--- Quote from: simj26 on December 11, 2014, 02:43:09 PM ---Checked the pushrods...they're fine. Would one cam lobe deteriorate that badly...on one side only? Must admit,this one is baffling me! ???
--- End quote ---
Yes , baffling . If the valve timing is off on just one side , and the rocker arms and push rods are alright , would indicate a bad cam . Can you verify that the lift is correct on the bad side ?
Dusty
Edit . OK Chuckie beat me to it , Anyway , yes , what he said .
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