OP
Sun, 17 Sep 2023 07:47:26 +0000

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Sun, 17 Sep 2023 07:47:26 +0000 quote
Has anyone fitted 07 engine to 03 model 125..looking at the pictures seems water pump has 3 outlets rather than 2..is this a problem..could I use a t or y piece to run from cylinder head..
Sun, 17 Sep 2023 19:46:48 +0000

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
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Sun, 17 Sep 2023 19:46:48 +0000 quote
is the motor air cooled or water cooled? injected or carbureted?

the likelihood of the compatibility for a swap is very low. an 03 would be a leader series motor and the 07 would likely be a quasar series motor.

while the later motor will physically fit, the wiring would be a nightmare.
OP
Mon, 18 Sep 2023 14:17:09 +0000

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Mon, 18 Sep 2023 14:17:09 +0000 quote
No they are both leader engines just the water plumbing is different..but thanks for input
Mon, 18 Sep 2023 21:06:58 +0000

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Mon, 18 Sep 2023 21:06:58 +0000 quote
sounds like you've got it well in hand then.
Tue, 19 Sep 2023 03:22:44 +0000

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Tue, 19 Sep 2023 03:22:44 +0000 quote
Is the water pump the same?
OP
Tue, 19 Sep 2023 06:32:25 +0000

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Tue, 19 Sep 2023 06:32:25 +0000 quote
Don't know if there the same as I bought the ped with the engine already fitted..from what I can gather carb model heads haven't got as many outlets as 06 onwards..I imagine it's to do with emissions..
It seems I have 07 head on original engine going by the codes.. I have blanked the hose with bolt and sealant.. now to see lol
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Tue, 19 Sep 2023 17:06:59 +0000

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Tue, 19 Sep 2023 17:06:59 +0000 quote
This is the extra outlet on the 07 head that needed blanking off



OP
Tue, 19 Sep 2023 17:08:34 +0000

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Tue, 19 Sep 2023 17:08:34 +0000 quote
Also this part needs a grommet ..the thermostat housing is different



Tue, 19 Sep 2023 17:34:16 +0000

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Tue, 19 Sep 2023 17:34:16 +0000 quote
what's the other head look like and what do the pumps look like?
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Tue, 19 Sep 2023 19:05:38 +0000

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Tue, 19 Sep 2023 19:05:38 +0000 quote
I don't have the original head..this is how the bike came...
Tue, 19 Sep 2023 23:17:43 +0000

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Tue, 19 Sep 2023 23:17:43 +0000 quote
I'm pretty sure the third outlet is a bypass so coolant can circulate in a loop before the thermostat opens. It wasn't on the US GT200 but appeared on the GTS 250.
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Wed, 20 Sep 2023 07:11:31 +0000

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Wed, 20 Sep 2023 07:11:31 +0000 quote
The bike was running when purchased but appeared low on water..signs of water leaks..the hose in question had a bung.. but seems to be leaking..
Looking at the explos the later heads have a bleed valve in the thermostat cover and would cover the 3rd hole..
I have a grommet for 3rd hole and thinking of putting a hollow bolt with a bleed nipple into the outlet to help bleed off the air in system once refilled..
Hopefully this will work 🙏
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