|
|
Post by maxifields on Jan 1, 2017 16:42:19 GMT
Since my last post .I had backfiring issue and took it to hemel hempstead scooters who fitted electronic ignition which has sorted out the backfiring.But it is still running rich.(I basically run out of cash for him to continue)
Its has a 20/20 Delorto carb 102 main 45/140 pilot.The guy said I should put a 50/140 pilot instead.(is this correct?)
As its is running rich (black plug)I've changed main jet to 98 main jet but its still running rich .Any ideas anyone.Thanks to anyone who replies
|
|
|
|
Post by phattanglo on Jan 2, 2017 7:52:30 GMT
Just a thought, would a hotter plug help.
|
|
|
|
Post by shipscat on Jan 2, 2017 8:55:01 GMT
here is a link scooterlounge.com/vespa/reference-library/vespa-stock-jetting-reference-guide.shtmlcheck the jets in your old carb air corrector , mix tube , main jet , idle jet and the slide number (the idle jet is different type on the 20/17 it only has 1 number) and compare the jets and slide in your 20/20 your old carb may be ok , the P.O may have messed with the jetting before you got it btw a 20/20 would not work well on my converted to 150 vnb1 the 20/17 made a world of difference |
|
|
|
Post by pxguru on Jan 2, 2017 18:32:03 GMT
I think the 20/20 will jet in ok but will use a different atomiser set up to the usual.
When you say rich it sounds like it is just at your usual riding speed. Try holding it wide open for 5 minutes and then check the plug colour by the side of the road.
What atomiser and air corrector are in it now?
|
|
|
|
Post by maxifields on Jan 3, 2017 7:15:07 GMT
I'll check tonight.cheers
|
|
|
|
Post by maxifields on Jan 3, 2017 18:51:51 GMT
the atomiser is E1 don't know if its worth mentioning I've put on a fast flow fuel tap on 12 months ago but told it shouldn't make it run rich.The plug is nk6hs
|
|
|
|
Post by pxguru on Jan 4, 2017 4:36:48 GMT
All seems OK. E1 is quite lean. Fast flow tap won't make much odds with yours.
What size is the air corrector?
|
|
|
|
Post by maxifields on Jan 4, 2017 20:24:24 GMT
The air corrector 140
|
|
|
|
Post by pxguru on Jan 5, 2017 11:00:37 GMT
I would say that is possibly the problem but you need to find out if it is running rich at 1/4 throttle or full throttle before changing anything. Running rich is slow and not economical but running weak gets really expensive too easily.
|
|
|
|
Post by maxifields on Jan 8, 2017 20:19:34 GMT
Went out today with 100 main jet and no cover over the carb/air filter and seems to be running fine.Spark plug the correct colour.Guess its going to be a case of trying different setups.
|
|
|
|
Post by maxifields on Mar 17, 2017 18:14:59 GMT
Just thought I'd update I now changed the 20/20 carb to a 20/17 Shipscat was right all along, Now running great ,Engine mountings next
|
|
|
|
Post by shipscat on Mar 17, 2017 19:25:04 GMT
cool glad i helped
i'm funked if know why a 20/20 will work just fine on a px 125 which has 3 transfer ports but not on a 150 2 port no matter what jetting ? maybe it has something to do with crankcase volume and pumping efficiency i don't really know but i'm learning
just out of interest what air corrector are you using ? the one that came with the carb ?
|
|
|
|
Post by maxifields on Mar 18, 2017 18:36:46 GMT
yes the one that came with the carb, don't know the size(will check) but putting the 20/20 on as advised by the scootershop now in E London was a big mistake a 80 quid mistake .I"d just got the scooter and took any advise I could get at the time.But slowly learning.
|
|
|
|
Post by maxifields on May 1, 2017 16:22:15 GMT
since I've put the 20/17 carb on ,I've had some issues and found so far the best setup is diffuser: E1
main jet 98
low running jet: 42
diffuser: E1
main air bleed: 140
throttle valve: No 0
starter jet: 60
I don't know why but anything larger than a 98 main jet just bogs it down
|
|
