bigpants Posted December 21, 2017 Share Posted December 21, 2017 Hiya everyone. Just got back from Xmas shopping , bike running fine but took lefthand side panel off and noticed block connecter from generator was really melted and as I touched it the wires came off and also the adjacent 4 wire block connector from cdi also melted - didn't touch that. Where do I even start ? Quote Link to comment
bigpants Posted December 22, 2017 Author Share Posted December 22, 2017 Should have said '87 slabside 1100 ! Quote Link to comment
CockneyRick Posted December 22, 2017 Share Posted December 22, 2017 (edited) Sounds like reg/rec blown. Check voltage at battery when running (Not long) if above 13/14v then def blown & probably boiling your battery too Edited December 22, 2017 by CockneyRick Quote Link to comment
CockneyRick Posted December 22, 2017 Share Posted December 22, 2017 Or just a shite earth? Quote Link to comment
bigpants Posted January 9, 2018 Author Share Posted January 9, 2018 Just got the old girl running again and voltage across battery terminals 14.6v , is that too high ? Quote Link to comment
Gixer1460 Posted January 9, 2018 Share Posted January 9, 2018 If rpm when measured was about 5000 then that's about top end ok - if that was at idle / tick over then no it's not ok. 1 Quote Link to comment
bigpants Posted January 10, 2018 Author Share Posted January 10, 2018 Yeah that was at low revs , don't know exactly but way lower than 5k. Hmm....is there a bodge I can do till I find a new gen/reg/rec ? Quote Link to comment
Gixer1460 Posted January 11, 2018 Share Posted January 11, 2018 10 hours ago, bigpants said: Yeah that was at low revs , don't know exactly but way lower than 5k. Hmm....is there a bodge I can do till I find a new gen/reg/rec ? No Bodge - at that level it'll boil the battery - best just fix it! Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 (edited) As he says, get the reg/rec done/replaced & hope your battery is still salvageable Edited January 11, 2018 by CockneyRick Quote Link to comment
dupersunc Posted January 11, 2018 Share Posted January 11, 2018 12 minutes ago, CockneyRick said: As he says, get the reg/rec done & hope your battery is still salvageable And lots of reg/recs will fit so no need to look for direct replacement. On an oil boiler? Really. If you are in the shit and need the bike for transport, disconnect the alternator wiring and run it total lose. You'll need to re charge every 40 mins 20 mins if you use the lights Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 What do u mean Dunc? Iv'e run a Honka, Electrex & a Yamhaha on previous boilers! Quote Link to comment
dupersunc Posted January 11, 2018 Share Posted January 11, 2018 13 minutes ago, CockneyRick said: What do u mean Dunc? Iv'e run a Honka, Electrex & a Yamhaha on previous boilers! The reg/rec is built in to the alternator on an oil boiler. How do you wire the mosfet or electrex units in? Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 Hahaha, ur right, getting me air & oils mixed up! Apologies, get another Alt @bigpants Quote Link to comment
bigpants Posted January 11, 2018 Author Share Posted January 11, 2018 Thanks for all the info everyone. Just to update you though , I just fitted the gen from my spare engine. There were some small visual differences to the gen casing but it fitted fine and bike fired straight up. But now reading 15.5v at battery terminals at approx 2 -3k. Could something else be causing this - I'm guessing not as the reg shouldn't be able to chuck out 15+v but thought I'd ask. Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 way too much, it'll boil your battery. Deffo the reg/rec in the Alternator end cover as @dupersuncsaid Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 (edited) If it's doing it with another Alt, then either they're both fooked, or i haven't got a clue? Also the Alts have different amounts of teeth on em & could destroy your Alt/clutch if they don't match Edited January 11, 2018 by CockneyRick Quote Link to comment
bigpants Posted January 11, 2018 Author Share Posted January 11, 2018 Different amounts of teeth ?! I don't like the sound of that. Guess she goes into temporary retirement till a new reg/rec is sourced. The coincidence of two regs being faulty is worrying but I guess I've got no options but to buy another and suck it and see. Quote Link to comment
bigpants Posted January 11, 2018 Author Share Posted January 11, 2018 Also Rick , could you explain the difference between the alts and how I identify which one goes with which engine. Ive done so much work trying to get both engines running over the years I can't be sure all the right parts are with the right engine anymore. The alt I just fitted did turn the engine much quicker. Thanks. Quote Link to comment
bigpants Posted January 11, 2018 Author Share Posted January 11, 2018 I've just realised how stupid that last sentence was. Bike did turn over really fast though. Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 Count the teeth on both, can't remember wot the different amounts are, but the 1100 & 750 def have different. You can swap the gear off the ends tho. Just make sure its well loctited on. And also i don't think the reg/rec is available seperately, it's the whole Alt you will prob have to get Quote Link to comment
Captain Chaos Posted January 11, 2018 Share Posted January 11, 2018 @bigpantsbefore spending money on another generator, check this out: http://oldskoolsuzuki.info/archives/400 1 Quote Link to comment
bigpants Posted January 11, 2018 Author Share Posted January 11, 2018 Hmm... cheers captain chaos. So the alt can be teased into overcharging. This might suggest there's nothing wrong with reg/rec but a fault somewhere else dragging the output voltage up. Well I've been having misfire/cdi issues since I got the bike running after an 8 yr lay up . I'm not sure where that leaves me but ill go over that thread u posted for me until I understand it. Also just discovered both my engines are u704 and not UK spec 703's. Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 Least the cogs are prob the same Quote Link to comment
bigpants Posted January 11, 2018 Author Share Posted January 11, 2018 Thank heaven for small mercies , or rather small cogs. Thing is how do I know which alt goes with which engine or which is the old alt out since both engines are 1052 u704's ? Quote Link to comment
CockneyRick Posted January 11, 2018 Share Posted January 11, 2018 I'd guess (and u can put em alongside eachother) that they are the same. Only worry i had was cogs, but i'm sure the 750's all had same teeth. Quote Link to comment
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