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 scooterlabs
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| posted on March 19th, 2014 at 01:20 PM |
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massive fuel consumption
Hi,
in the interest of forum etiquette, I have been searching, fiddling, photographing and gps-ing before asking.
Please note; i am a vespa mechanic so I am dumb enough to try it myself and smart enough to ask those who know. Never worked on one of these before.
Also i know fuel mileage talk is lame, but when it is half and there are no leaks there must be some power available somewhere when it is put
right.
OK. here's a list of facts. I am hoping there's a simple thing here, but the DC seems to be getting less than half what the 'internet'
suggests.
facts:
1600 2-port
34PICT-3
seems to be running ok
runs like a baG o' S*&^* for about 2km in the morning
USED 38 litres (same pump same level) to travel a TRUE 170km (GPS)
that's 22 litres per 100km commuting 9km twice a day
ACTIONS:
last night I checked and the choke butterfly wasn't sitting vertically (probably 15-20degrees from vertical) can this have any effect?
This morning i loosened it and turned it around to make sure it is disabled for the time being. (vertical).
I left the idiot book and bentley at home so i followed the instructions online to adjust the bypass and volume. it only really would idle with the
bypass three quarters - one turn out (internet said 2.5 turns start) Is there a clue here or is it normal?
from my experience with 2 strokes, the main cause of unfathomable fuel use when driven by newbies is a badly tuned idle jet causing the rider to
throttle up straight to main where there is some power. Any input here would be great.
Cheers
derek
happy to answer and scooter questions.
Derek
Scooterlabs, Collingwood.
73 DC
59 Lambretta
62 Lambro
81 vespa racer
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bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
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| posted on March 19th, 2014 at 01:51 PM |
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What distributor do you have?
What colour is the inside of your tail pipe (brown or just black?)
How old is the engine? Good compression etc? When worn (like my baja) you gotta bury the foot to compensate for lack of power.
Are you running any exhaust apart from stock?
When was the last time you serviced your air filter? What condition is it in?
Drum brakes on the rear properly adjusted? (ie: no brake drag)
Tyre pressures correct (not lower than spec)?
Wheel alignment up to date?
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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scooterlabs
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| posted on March 19th, 2014 at 04:32 PM |
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Thanks for the reply
| Quote: | Originally
posted by bajachris88
What distributor do you have?
What colour is the inside of your tail pipe (brown or just black?)
How old is the engine? Good compression etc? Not checked yet - When worn (like my baja) you gotta bury the foot to compensate for lack of power.
Are you running any exhaust apart from stock? nope
When was the last time you serviced your air filter? What condition is it in? I'll check. Only had the ute three weeks
Drum brakes on the rear properly adjusted? (ie: no brake drag) All good
Tyre pressures correct (not lower than spec)? OK
Wheel alignment up to date?
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1- It is unmarked, shiny and has a red plastic box in there instead of points.
2- i'll check now
3- OLD
4- dunno yet
5- I'll check the filter. Only had the ute three weeks
6- - Not too bad but is booked in.
7 - Brake is good
8- tyres ok
9 - wheel alignment is not dramatically out but it is booked in for one.
do you think the choke thing might be a factor?
cheers
derek
Derek
Scooterlabs, Collingwood.
73 DC
59 Lambretta
62 Lambro
81 vespa racer
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scooterlabs
Learner Dubber
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| posted on March 19th, 2014 at 04:34 PM |
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Oh forgot , the tailpipe is a Dickensian chimney.
sweeping my finger inside completely coats it with a thick layer of jet black powder.
Derek
Scooterlabs, Collingwood.
73 DC
59 Lambretta
62 Lambro
81 vespa racer
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mnsKmobi
Wolfsburg Wizard
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| posted on March 20th, 2014 at 11:46 AM |
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My guess is that your heat risers (which heat the intake using the exhaust) are blocked. That would definitely explain the bad initial running and
probably be a factor in the poor fuel economy. Check out here for more info including how to unblock them:
http://www.vw-resource.com/heat_risers.html
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nils
Fahrvergnugen
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| posted on March 20th, 2014 at 12:36 PM |
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Float levels
fuel pressure overcoming needle and seat
rotten ignition leads,rotor or cap
spark plugs/gap
you got alot of things to check ahead of you my friend, 
Quit calling rust patina
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BRUTUS
A.k.a.: et tu, Brute
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| posted on March 20th, 2014 at 10:26 PM |
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Apart from float levels, choke, etc. you should check that the main jet is firmly screwed into place. Easy to check; if it is loose or perhaps
cross-threaded) will use heaps of fuel. (Could be totally the wrong size too...)
ACE 30 & 40 oils: specifically engineered for your Air Cooled VW
delivered (free del.) throughout Yarra Valley / Ranges, & Gippsland areas. Also ACE 20, 50 & 90.
FOR SALE: ACE 30, 40 etc. Oil formulations & Trade-names.
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scooterlabs
Learner Dubber
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| posted on March 21st, 2014 at 08:10 AM |
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plugs and main jet inspection today (mixed with a smattering of superficial stuff like door cards)
since getting the choke off I have made 70km and its at the 1/4 mark. I know, i know the gauge means nothing. i'm hoping to tackle Nils' list with
250km per 40litre as a starting point.
Derek
Scooterlabs, Collingwood.
73 DC
59 Lambretta
62 Lambro
81 vespa racer
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 matberry
Super Moderator
Go hard or go home
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| posted on March 21st, 2014 at 11:03 AM |
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Also is the cooling system up to scratch.....lots to check yet, but to answer one of your questions, yes the choke will influence economy and should
definately be off/verticle once warmed upA photo tells a thousand words, post up some pics of your engine bay, carb dissy even outside engine lid rear
louvers and what not can influence things.....on one of these wierd air cooled automobiles. 
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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