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Subject: "How can i stop flooding my LI 150?" Archived thread - Read only
 
 
Conferences > International Scooterist BBS > Topic #20877
Reading Topic #20877

mothy
Member since Apr-28-03
144 posts
Dec-23-03, 07:56 PM (EDT)
 
"How can i stop flooding my LI 150?"
 
   Its super easy to flood my S3 LI150, if i stall out or idle out it takes forever to get it going again until i wait a few minutes or kick it with the fuel closed for a while then retry.
The bike has been machined up to a 175cc and i upjetted the si18 carb to 110 to compensate. Would getting a better carb like a flatslide or something similar help? I've been thinking about getting a 24mm mikuni or keihin type carb.

any suggestions

Tim


 

 
MarkH
Member since Jun-7-02
1642 posts
Dec-23-03, 08:47 PM (EDT)
 
1. "RE: How can i stop flooding my LI 150?"
In response to message #0
 
   I've had that problem on every Lambretta I've ever owned. What I do is keep the fuel off until the bike has started and warmed up for a few seconds. Then I try to turn the fuel off before I kill the engine. It just lets some of the excess fuel burn and keeps you from flooding the engine so frequently.

It's been trouble free starting ever since I started doing this. Though there have been a couple times when I rode off, forgeting to turn the fuel on and dying a couple blocks down the rode.


www.lambretta.org


 
RH Gumbie
Member since Jun-4-02
7357 posts
Dec-23-03, 08:54 PM (EDT)
 
2. "RE: How can i stop flooding my LI 150?"
In response to message #0
 
   >Its super easy to flood my S3 LI150, if i stall out or idle
>out it takes forever to get it going again until i wait a
>few minutes or kick it with the fuel closed for a while then
>retry.
>The bike has been machined up to a 175cc and i upjetted the
>si18 carb to 110 to compensate. Would getting a better carb
>like a flatslide or something similar help? I've been
>thinking about getting a 24mm mikuni or keihin type carb.

It's teh curse of the almost anything piston ported. Try not throttling at all when you first try kicking over the scooter. Also keep teh carb choke out once you do have it started for at 3 minutes as the carb needs to warm u.

Yes, upgrade teh carb to either a 22mm jetex or one fo the Mulkuni/Kaunin 24mm. They'll flood too, but you'l like them mroe then any 20 or 18mm del orto.

Unjoy,
Das Twit


 
scootRS
Member since Jun-7-02
1069 posts
Dec-23-03, 10:16 PM (EDT)
 
4. "RE: How can i stop flooding my LI 150?"
In response to message #2
 
   Regular carbs and Jetex copies flood far more often than newer carbs. I've yet to see a pool of gas under my scooter since changing the carb; before every once in a while.

Personally, I think Jetex are overpriced crap. You'll need a new manifold for it anyway, so why bother? Get a 24 Keihin or Mikuni type. We have roundslide kits for only $59 (!), or the flatslide PWK types for double that.

Here's a quote I think from the BBS before:

"Do yourself a HUGE favor. Dump the Jetex and get a Mikuni or Keihin. Those Jetex carbs will give you nothing but trouble. I fought with mine for close to a year before I got a Keihin pattern from scootRS and the difference is amazing. It's soooo much smoother, idles like a dream, never a hiccup."

http://scootRS.com/tech.cfm?tip=lamcarb

Randall~
scootRS Lambretta Vespa Scooters and Parts Manufacturing ~~
we manufacture cool ~~

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mothy
Member since Apr-28-03
144 posts
Dec-24-03, 00:10 AM (EDT)
 
5. "RE: How can i stop flooding my LI 150?"
In response to message #4
 
   Thanks randall, i had emailed you about your PWK the other day.
I like posting to the BBS to get other opinions on stuff like this before i buy somthing.
Chelsea is an hour away from me but shes out of stock on her 24 mikuni so it looks like i may order from you.

Thanks alot

Tim


 
RH Gumbie
Member since Jun-4-02
7357 posts
Dec-24-03, 11:34 AM (EDT)
 
6. "RE: How can i stop flooding my LI 150?"
In response to message #5
 
   >Thanks randall, i had emailed you about your PWK the other
>day.
>I like posting to the BBS to get other opinions on stuff
>like this before i buy somthing.
>Chelsea is an hour away from me but shes out of stock on her
>24 mikuni so it looks like i may order from you.

mikuni's are a bitch to set up too. but great once you have em up and running just right.

Randall- Jetex's are dirt cheap if you ask me as are their manafolds. I don't think I paid mroer then $50 for teh full set up plus I had mine bored out to 24mm. That being said they're not the most responsive carb I've ever used.

Unjoy,
Das Twit


 
CB
Member since Jun-19-02
136 posts
Dec-23-03, 10:07 PM (EDT)
 
3. "RE: How can i stop flooding my LI 150?"
In response to message #0
 
  
That carb doesn't breathe enough for that setup, so you're always running rich. Jetex or 24 Dellorto should be good.

Craig


 

 

 


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