Tue Jul 27, 2021 10:02 am

Member
Piaggio Fly 150
Joined: 08 Apr 2021
Posts: 20
Location: Jackson, Calif.
 
Member
Piaggio Fly 150
Joined: 08 Apr 2021
Posts: 20
Location: Jackson, Calif.
Tue Jul 27, 2021 10:02 am linkquote
My Piaggio is having a hard time starting when the engine is hot, starts first time perfectly every day, if engine is hot and running and I stop and then immediately re-start it will fire up, but not after it's been sitting awhile, like while eating lunch or shopping in a store or even sitting in front of my house for an hour or two will be it be hard to start. Giving it a lot of gas in this situation is the only way can get it to fire and sometimes I have to crank it quite a bit and give it a lot of gas before I am able to do so, several cranks for several seconds while opening throttle a good ways. I'm worried I will wear out the battery/starter or it will eventually fail to start completely and I will end up getting stuck somewhere.

Some videos I watched got me thinking it might be the evap collection system, maybe it needs to be removed? Or possible vapor lock? Fuel delivery system issue? seems to have started doing this when Summer kicked in, daytime highs here average low to mid 90s all summer long and routinely get up to 100+. I also did have the muffler removed when I got the back tire changed right before it started doing this, and it does seem to be making a slight 'backfire sound' after a hot start, I'm not sure if this was there before or not.

Any ideas? Thanks

Last edited by CaliScooterGuy on Tue Jul 27, 2021 1:47 pm; edited 2 times in total
Tue Jul 27, 2021 10:47 am

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 9286
Location: The state of insanity, SoCal
 
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 9286
Location: The state of insanity, SoCal
Tue Jul 27, 2021 10:47 am linkquote
Pull the evap line from the carb. You don’t need to eliminate the whole system.

Check and adjust your valves.
Tue Jul 27, 2021 12:00 pm

Member
Piaggio Fly 150
Joined: 08 Apr 2021
Posts: 20
Location: Jackson, Calif.
 
Member
Piaggio Fly 150
Joined: 08 Apr 2021
Posts: 20
Location: Jackson, Calif.
Tue Jul 27, 2021 12:00 pm linkquote
greasy125 wrote:
Pull the evap line from the carb. You don’t need to eliminate the whole system.
Will do.
greasy125 wrote:
Check and adjust your valves.
How hard is that? never done it before.

Last edited by CaliScooterGuy on Tue Jul 27, 2021 2:05 pm; edited 1 time in total
Tue Jul 27, 2021 2:04 pm

Member
Piaggio Fly 150
Joined: 08 Apr 2021
Posts: 20
Location: Jackson, Calif.
 
Member
Piaggio Fly 150
Joined: 08 Apr 2021
Posts: 20
Location: Jackson, Calif.
Tue Jul 27, 2021 2:04 pm linkquote
greasy125 wrote:
Pull the evap line from the carb.
is it ok to leave evap line disconnected or do I need to plug or remove it?
Tue Jul 27, 2021 2:51 pm

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39966
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39966
Location: Pleasant Hill, CA
Tue Jul 27, 2021 2:51 pm linkquote
CaliScooterGuy wrote:
is it ok to leave evap line disconnected or do I need to plug or remove it?
You can leave it dangling and the carb inlet open.
Tue Jul 27, 2021 4:05 pm

Sponsor
Granturismo 218
Joined: 04 Feb 2013
Posts: 6739
Location: NWAOK
 
Sponsor
Granturismo 218
Joined: 04 Feb 2013
Posts: 6739
Location: NWAOK
Tue Jul 27, 2021 4:05 pm linkquote
If it's idling off the throttle screw, and not the idle circuit, it will be very hard to start when things warm up.
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