GT380M Restoration

Here you can write about your restoration highs and lows and hopefully final success
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Peter
Posts: 67
Joined: Mon Dec 03, 2018 2:20 pm
Location: Northern Ireland

Re: GT380M Restoration

Post by Peter »

Yeh as good as the wiring diagram is, it doesn’t have an orange live with a green marker on it
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canaletto5
Posts: 5228
Joined: Tue Jul 23, 2013 8:43 pm
Location: Derbyshire

Re: GT380M Restoration

Post by canaletto5 »

Look at this one for the 550. It is the same set up as the 380 (Apart from the starter solenoid wire which isn't relevant )

viewtopic.php?f=31&t=6713
Peter
Posts: 67
Joined: Mon Dec 03, 2018 2:20 pm
Location: Northern Ireland

Re: GT380M Restoration

Post by Peter »

Found my issue! Pattern rear light is wired the wrong way! Luckily still had the genuine lamp, so will switch out the bulb holder for the fresh plastics.
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canaletto5
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Joined: Tue Jul 23, 2013 8:43 pm
Location: Derbyshire

Re: GT380M Restoration

Post by canaletto5 »

Peter wrote: Thu Aug 27, 2020 10:50 pm Found my issue! Pattern rear light is wired the wrong way! Luckily still had the genuine lamp, so will switch out the bulb holder for the fresh plastics.
As if restoring these beasts wasn't hard enough! :lol:
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Alan H
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Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: GT380M Restoration

Post by Alan H »

Just swap the wires over where the bullet connectors join.
Proof that four strokes are over complicated
Peter
Posts: 67
Joined: Mon Dec 03, 2018 2:20 pm
Location: Northern Ireland

Re: GT380M Restoration

Post by Peter »

If only it was that easy! The bulb now works in reverse. Ie. The high watt element comes on for the dipped headlight and the lower watt comes on for the brake.

I still had the genuine brake light and it worked perfectly so I have a bit of work in swapping out the plastics while keeping the genuine bulb holder and cable
Peter
Posts: 67
Joined: Mon Dec 03, 2018 2:20 pm
Location: Northern Ireland

Re: GT380M Restoration

Post by Peter »

There is another slight quirk and maybe normal but with me being new to a classic bike thought i'd ask.

Sometimes when coming to a stop with headlamp off, the bike will idle slightly higher, maybe around 2k-2.5k. As soon as I put headlamp on and put a load on the engine, it drops down to 1500k. Is this normal enough behaviour with a bike this age?

If I switch the lamp off then, it doesn't rise in revs.
barney01
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Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: GT380M Restoration

Post by barney01 »

Are you sure this is related to the headlamp? The problem you have is called a hanging idle which is more often than not caused by sticking throttle cables, usually the return cable.
NO SMOKE .......NO POKE
Peter
Posts: 67
Joined: Mon Dec 03, 2018 2:20 pm
Location: Northern Ireland

Re: GT380M Restoration

Post by Peter »

Good shout! I’m nearly sure it is caused by putting load on the engine from the headlamp but I will have a look the next time it happens to see how quickly the throttle arm moves back down.
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Alan H
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Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: GT380M Restoration

Post by Alan H »

Or the bulb has been forced in upside down. Seen that before too.
Proof that four strokes are over complicated
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