Measure your jets! (I know this is old news for many)
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Hooked
1984 PX200E, 1962 Fuji Rabbit S601, 1963 GL, Gilera GSA, Vespa GS160, aTri-ped Micocar, and bunch of mopeds and shifty fifties
Joined: 04 Apr 2015
Posts: 211
Location: St. Louis
Mon Jan 04, 2021 10:11 am quote
I ordered a tool to measure my jets from now on.

I had a 142 main, my plug looked like I was running a bit lean. I had tossed a 145 in a few days ago, "soft" seized on a long straightaway. Comparing the jets, the 145 was significantly smaller than the 142. Put the 142 back in for the ride home and it was smooth sailing. I had been chasing my tail with this for a bit assuming my jets were marked correctly.

Mislabeled jet was a SIP jet.-Since I haven't measured any this may be a fluke I will be checking them all from now on.
Molto Verboso
Vespa
Joined: 19 Jun 2007
Posts: 1248
Location: California
Mon Jan 04, 2021 10:49 am quote
Main Jet

9334AE80-E62A-43D7-9C98-E1071AB69448.jpeg

Hooked
1984 PX200E, 1962 Fuji Rabbit S601, 1963 GL, Gilera GSA, Vespa GS160, aTri-ped Micocar, and bunch of mopeds and shifty fifties
Joined: 04 Apr 2015
Posts: 211
Location: St. Louis
Mon Jan 04, 2021 11:48 am quote
^I had no idea that SIP jets were known to be that different. Thanks
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