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Post by unclechufty on Oct 19, 2014 10:22:58 GMT
Got a question. I want to remove the oil pump from the engine. If I run petrol/ oil mix, will I have to change the jets on the carb?
cheers, UNCLE CHUFTY
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Post by hilly on Oct 19, 2014 15:17:22 GMT
i never did with my pug just make sure you blank it of wright so it does ant take in air /
i never up jet a px when dumping auto lube
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Post by unclechufty on Oct 19, 2014 16:59:40 GMT
Works for me!
cheers for that, UNCLE CHUFTY
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Post by henri on Oct 20, 2014 8:46:32 GMT
ive always gone up 2 jet sizes when pre-mixing , makes sense , as oils now going through jet if ya dont increase size ya leaning ya mixture , if ya check out the right info on px auto-lube versus pre-mix (not the beedspeed chart its wrong) the pre-mix main jet is 2 sizes bigger . H
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Post by unclechufty on Oct 20, 2014 15:37:41 GMT
I was wondering. My thinking being that mixed fuel is going to be more viscous,(slightly,) but the leaning out argument makes sense too. On the safe side, can't hurt to upjet by 2 points on the main jet.
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Post by henri on Oct 21, 2014 6:15:11 GMT
i reasoned it from the "dont put extra 2 stroke in thinkin its better lube for ya engine ,it leans it up=seize" advice i was taught as a nipper, its got to be the same ,the jet size is set ,so if ya run oil through it logically theres got to be less fuel , well thats how my brain runs it , i wait to be corrected ,H
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Post by unclechufty on Oct 21, 2014 15:55:15 GMT
It's making sense to me!
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Post by unclechufty on Oct 21, 2014 20:24:06 GMT
While were here, and since you boys know more about this stuff than I do, on the right hand side of the motor, the top of the fan cowling is just a big hole. Should there be some sort of cover over this hole directing air flow at the barrel?, (like a real scooter!)
cheers, UNCLE CHUFTY
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Post by hilly on Oct 22, 2014 1:08:48 GMT
on jetting yes on vespa everyone woud go up 2 on the main but if you think like that then the idel is to small an atomizer an so
the resan we went up 2 was becaues we new no better an just put the jets to how the old type was set up
the main reson this was done was becaues most pepol were so shit at mixing the oil we put extra fule there to cope with this
old type px carbs an efl carbs dont work in the same way so yes h is wright saying dont go over the top with the oil an yes the fule does cool it
ive set vespas an pugs up on dyno an you woudbe suprized at wot you end up runing if you are not runing standed exhaust then up jet
pug did size but that was becaues crap woud build up in the injector an then dog it an game over it woud size flat out but round town it woudbe ok the other thing was kids woud put the cheap oil in an not all ways oil for autolube so again it woud size so make shaw use good oil an the wright stuff for wot you are doing
most the scooters i work on come to me over jetted an the timing a mile out theres alot more to setting a bike scooter up than you think
i no longer work in a scooter shop i do alot from round by me an my bikes get there an back thay have to i ride with the lads all the time
there are alot of clever pep on hera so id try to find some one by you to help you out with you bulid
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Post by henri on Oct 22, 2014 7:27:35 GMT
yes if ya runnin a dyno an exhaust gas anylyser n CHT i'd change atomisers n prob only upjet by 1 size to start with n "suck it n see" , but for "seat of pants" jetting i go 2 sizes n run rich ,i only dyno on rare full tune motors as it costs too much for daily hacks,
i agree with hilly bout the bad timing on most home builds ,the marks on cases or on fan covers are well inaccurate an people dont make the effort to degree disc/DTI it an dial it in proper ,especially if the motor design is over 15 years old standard timing=pinking .the fuel has changed ,for instance standard px150 is 19deg btdc ,run at that n it will pink ,i start at 17deg n work from there .got a friend who does rally miles on a p200 with sip road2 n drilled filter ,in a year he burnt 3 pistons til he got to 16deg btdc ,standard is 21 ,
an as others said above run the pug without a cowling an it will nip up smartish , reckon youve a e bay cruise or session with glassfibre on the books , if you do make your own ya need to bake all the excess gel out or it will catch fire in use , a hour at gas mark 2 was what i used, dont use a oven you want to cook in after an do it in a garden not inside, leccys better than gas ,never tried a microwave .
an as hilly says where are ya ,might be someone on here close by cud put eyes on ,hope its me as i love seeing other peeps sheds n projects , an as i said on other post admired ya work/thinking back in the day on bikes . H
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Post by unclechufty on Oct 22, 2014 15:34:46 GMT
Well, looks like I'll be after a head/barrel cowling, and I'll be upjetting the carb. Location, I'm in Bournemouth.
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Post by henri on Oct 23, 2014 8:21:10 GMT
ah well , i suppose somebody has to be ,nearest i get is weekends just other side of winchester in petersfield , its winter ,maybe nxt year i might be that way but 60miles is too cold to hack jus for a natter , mind you ive done further jus to see a interesting scoot/bike/person but i'm old/cold n achy now, H
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Post by unclechufty on Oct 23, 2014 10:04:41 GMT
Yeah I can dig that!
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