http://uk.groups.yahoo.com/group/guzzi750/ 1970s Moto Guzzi 750cc - V7 Sport/S/S3 Mon, 09 Nov 2009 01:22:31 GMT damian http://uk.groups.yahoo.com/group/guzzi750/message/2281 http://uk.groups.yahoo.com/group/guzzi750/message/2281 I typed the wrong way round I meant throttle not revs. Sorry. Anyway, hate to harp on about it but if your fuel filler vent isn't working that will cause lack Sun, 08 Nov 2009 06:58:15 GMT akguzzi http://uk.groups.yahoo.com/group/guzzi750/message/2280 http://uk.groups.yahoo.com/group/guzzi750/message/2280 HI all, working on the assumption that my misfire could be caused by a weak spark I tested the voltage to the coils (Dyna coils and Dyna 3 ignition). Battery Fri, 06 Nov 2009 13:42:02 GMT Paul Russ http://uk.groups.yahoo.com/group/guzzi750/message/2279 http://uk.groups.yahoo.com/group/guzzi750/message/2279 Hi Roger,   I don't want to state the obvious but have you tried fitting a brand new set of plugs.   I seem to experience the same problem as you on my 750S Thu, 05 Nov 2009 21:27:49 GMT Roger Bourne http://uk.groups.yahoo.com/group/guzzi750/message/2278 http://uk.groups.yahoo.com/group/guzzi750/message/2278 Thanks. To clarify, issue is throttle related, not rev related. Happens when bike is cold and hot, no difference. Many people leap to carb issues on that basis Thu, 05 Nov 2009 21:20:52 GMT damian http://uk.groups.yahoo.com/group/guzzi750/message/2277 http://uk.groups.yahoo.com/group/guzzi750/message/2277 If you re read my post the first thing I said was that I assumed the description was accurate. The origional post described a breakdown related to revs not Thu, 05 Nov 2009 19:20:33 GMT Roger Bourne http://uk.groups.yahoo.com/group/guzzi750/message/2276 http://uk.groups.yahoo.com/group/guzzi750/message/2276 HI all, thanks for al your feedback. To me getting the ideas and experience of others is a key role of this forum. I'll work through it all slowly starting Thu, 05 Nov 2009 11:20:07 GMT mandello1974 http://uk.groups.yahoo.com/group/guzzi750/message/2275 http://uk.groups.yahoo.com/group/guzzi750/message/2275 Roger, I assume that you have already done this when you rebuilt the bike, but I agree completely about the earthing points and problem sthey can give. I Thu, 05 Nov 2009 11:01:51 GMT david4868 http://uk.groups.yahoo.com/group/guzzi750/message/2274 http://uk.groups.yahoo.com/group/guzzi750/message/2274 Roger, Damian is right in that you should start with the simplest things as I encouraged you to do previously and not tear your bike down. However, your Wed, 04 Nov 2009 22:29:16 GMT damian http://uk.groups.yahoo.com/group/guzzi750/message/2273 http://uk.groups.yahoo.com/group/guzzi750/message/2273 Stop all this now. Don't go pulling your bike apart before you have to. If I assume your post below is accurate most of what has been suggested isn't going to Wed, 04 Nov 2009 18:30:00 GMT Roger Bourne http://uk.groups.yahoo.com/group/guzzi750/message/2272 http://uk.groups.yahoo.com/group/guzzi750/message/2272 Hi Martin, yes easily done. I have another bike with points so may try that if a few of the simpler options offered here don't help first. Cheers Roger Via Wed, 04 Nov 2009 18:27:56 GMT Roger Bourne http://uk.groups.yahoo.com/group/guzzi750/message/2271 http://uk.groups.yahoo.com/group/guzzi750/message/2271 Now there's an idea. I do have a newly powder coated frame and coil brackets.... Via Blackberry Roger Bourne Corporate Communications Manager Plant & Food Wed, 04 Nov 2009 18:24:03 GMT Roger Bourne http://uk.groups.yahoo.com/group/guzzi750/message/2270 http://uk.groups.yahoo.com/group/guzzi750/message/2270 142 mains with K and N filters. I know I should go up a bit for those filters but ran perfectly that way before rebuild? Via Blackberry Roger Bourne Corporate Wed, 04 Nov 2009 16:14:09 GMT Martin Bailey http://uk.groups.yahoo.com/group/guzzi750/message/2269 http://uk.groups.yahoo.com/group/guzzi750/message/2269 Is there any way of reverting to the original ignition set up without ripping the loom apart?  It would be useful to switch back to the old system for a test Wed, 04 Nov 2009 13:26:54 GMT david4868 http://uk.groups.yahoo.com/group/guzzi750/message/2268 http://uk.groups.yahoo.com/group/guzzi750/message/2268 Hi Roger, I have had a number of sets of 3 ohmn dual plug Dyna coils, initially I didn't earth them properly (on a newly restored powdercoated frame) and then Wed, 04 Nov 2009 10:00:19 GMT mandello1974 http://uk.groups.yahoo.com/group/guzzi750/message/2267 http://uk.groups.yahoo.com/group/guzzi750/message/2267 Roger - what size main jets exactly are you using and what air filter system are you using, i.e. just the rubber box thing??