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Post by bananasplit on Jul 21, 2019 19:38:06 GMT
I have just swapped from a PHBH to a BGM SI26/26
on my Malossi 210 to get better fuel economy.
I now have a flat spot in 4th when coming off throttle and resuming.
Lots Of threads on the subject but no one ever seems to find the answer.
I’ve tried upping the idle jet to 68/160 changing the mixer tube BE3 to BE4 , have not yet tried changing the air corrector.
Plug looks a little lean
Any ideas please ?
P200- malossi 210
Si26/26 BGM
SIP Fastflow
SIP Road 2
BE3
55/160 idle
160 corrector
140 main jet
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Post by shaunbond on Jul 22, 2019 17:30:39 GMT
I always get kick back after posting this, but nevertheless I can guarantee that it fixed the same issue on my PX200 HB stage 4 and SIP Road 2.
When rebuilding the frame I was lazy and didn't fit the drip tray, tried all sorts to fix the flat spot when coming off throttle, particularly in 4th. Someone suggested to fit the tray and it stopped it completely.
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Post by mijapxman on Jul 22, 2019 22:32:35 GMT
I always get kick back after posting this, but nevertheless I can guarantee that it fixed the same issue on my PX200 HB stage 4 and SIP Road 2. When rebuilding the frame I was lazy and didn't fit the drip tray, tried all sorts to fix the flat spot when coming off throttle, particularly in 4th. Someone suggested to fit the tray and it stopped it completely. That could very well be a fix, no Idea why you'd get kick back for suggesting this ! It was written about in Scootering Magazine years ago. I found this out by trial and error in the 1980's, especially after Helping jet a few 125cc motorcycles that had, had their airboxes drilled. Got me to thinking that tray helps the vespa frame act as similar to an airbox. Have always said fit the tray when jetting a standard type carb, to eliminate the flatspot. By the way, Scootering proved it on an 210 Malossi, dyno'd with and without the drip tray!! Mij☺ |
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Post by ianmartin40 on Jul 23, 2019 10:25:57 GMT
The drip tray is not usually a perfect seal, it does however reduce the size of the airbox/frame air space and although it may not be a perfect seal it would still act as a baffle/flow restrictor and if it works as a fix, what a cheap and easy fix! we all love those!
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Post by bananasplit on Jul 23, 2019 11:46:59 GMT
Looks like I’m off looking for a drip tray
Will report back
Thanks
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Post by mijapxman on Jul 23, 2019 12:36:19 GMT
When I say, that could very well be the fix, you may find you have a drip tray already fitted!
If you do, I would try pressure testing the engine, to make sure you don't have an air leak, before trying rejetting.
Mij☺
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Post by mijapxman on Jul 23, 2019 13:06:13 GMT
Just had a wee goo#le search about the drip tray and carb jetting, yip loads of doubters!
Wish I could remember/ find the Scootering Magazine issue it was in!. From (my bad) memory, I believe it was a Malossi 210 fitted with a standard type carb that had a flat spot. Think it may have been Malk Anderson @ Midland Scooter Center that told them about needing the drip tray fitted !
Mij😉
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del
1st Class Ticket
Still riding a 125. 200 still on bench.
Posts: 82 
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Post by del on Jul 24, 2019 14:12:24 GMT
when i fitted my sip speedo, I took the drip tray out to run the cable. I had problems until I put the tray back. I left it out as I couldn't fit it without undoing the panel locks.
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Post by bananasplit on Jul 25, 2019 15:12:07 GMT
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Post by ironsloth on Jul 25, 2019 17:47:27 GMT
70mph on a Vespa?? Aim for something bloody soft...
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Post by shaunbond on Jul 25, 2019 18:20:20 GMT
Another resolution by fitting a drip tray, maybe people will listen.... Or maybe not... lol
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Post by scooterg on Jul 25, 2019 20:08:55 GMT
Drip tray
Don’t have a clue
Where’s it go!any pics or google link
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Post by mijapxman on Jul 26, 2019 9:23:19 GMT
It's fitted to the frame, under the fuel tank. Bud 😉
Mij☺
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Post by scooterg on Jul 26, 2019 20:10:47 GMT
Fuel tank out ?
think I need a fast flow fuel tap
so when the tanks out 🤔🤔
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Post by mijapxman on Jul 27, 2019 9:17:01 GMT
Yes, tank out. Your scoot should already have one fitted as standard, they only go missing if someone has removed it from PX models, usually because the are too lazy to refit it.
Can't remember if they are fitted to the other large frame models, think they maybe.
Mij☺
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Post by scooterg on Jul 27, 2019 10:39:03 GMT
Cheers mij
Will have a look when I take the tank out
If missing will replace.
And thanks to shaunbond for the heads up
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Post by scooterg on Aug 4, 2019 16:55:20 GMT
Removed the tank,Checked and mines still there 👍
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