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Post by fredperry2 on Aug 24, 2007 7:55:23 GMT
 hi im new to the forum and been recommended here for help and join in with you guys,. i have a 1978 vespa 100. been stored for 16 years and just recently mot.d ;D but!! i wanted a bit more go from the lil guy and fitted a primmy top end. now shes slower than ever. WHY!!!  help..... first of all i also have a 19mm carb fitted and jetted to the 125...i havent adjusted the timing...could that be it? ?? also which way around does the piston go?? cant find an arrow on the crown...so which way does the port in the piston go??? sorry for the ramble but im frustrated as hell and wanna get out on her ...please help...and this forum is great...!!!! ;D cheers!
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Post by adspeed on Aug 24, 2007 8:02:58 GMT
Which way round do you have the piston?
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Post by smallyshane on Aug 25, 2007 8:48:22 GMT
Hi Mate, Sorry to hear she's poorly...  Just dug out my old et3 barrel and piston, cleaned it up to find it marked SC>-> pointing to the side without a port on it.. Stilll couldn't tell you which way round it goes but sure someone else could help now you know which way the arrow points.. I think it normally point to the exhaust port but could be totally wrong on that?!?!?!?! (someone else???) All the best mate. |
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Post by Juan on Aug 25, 2007 10:43:20 GMT
Welcome Fred,glad you like the place. Your piston should have an arrow on the crown but it's not important.Fit the piston with the port facing the carb intake side(i.e.-facing downwards).  |
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Post by fredperry2 on Aug 26, 2007 7:37:19 GMT
thanks guys. at least i know the piston is the right way round. now, how about the timing? could that be the cause for loss of power??? ive left the timing as standard v100....i am sooo gutted as i thought that the lil dude would go considerably better with the primmy top end....not slower lol...thanks for the help so far guys....great forum...so many like minded smallframe nuts hahaha....down here they all like p2's etc.....(FAT ARSES") lol...ive recently aquired another smallframe cutdown too...  so ...timing? ? |
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Post by breezer on Aug 26, 2007 9:21:20 GMT
engine probs etc aren't my speciality, so I'll let the others sort that for you.
Smallie cut down (jealous) am looking for a cheap bike in poor bodywork condition (ie dented etc) to cut down, there seem to be loads already cut down out there but I wanna do it myself.
Everyone thinks there rust buckets are worth a small fortune though. I mean, it's not like they have ever won 1st place at a vintage bike show is it? ;D ;D
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Post by fredperry2 on Aug 27, 2007 7:12:33 GMT
i bought this particular old imported 50n with a cutdown in mind. very rotten footboards etc. cost me just £60 for the whole scoot... maybe my v100 will win some prizes soon buddy....maybe i can snatch one from under yer nose ...lol... |
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Post by Juan on Aug 27, 2007 21:41:31 GMT
90 = 19 BTDC
Primmy = 24 BTDC
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Post by MiNiKiN on Aug 28, 2007 20:42:11 GMT
Are you still running on points? renew the points and the capacitor first. I guess you run the 19mil carb on a 19mil manifold?
You stored for so long - is the fuel flow too low, possibly due to old fuel / debris blocking something in the fuel supply (carb and/or fuel tap, sieve)
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Post by fredperry2 on Aug 31, 2007 1:24:24 GMT
still on points... yes 19mm carb and manifold. flushed the fuel system...will adjust the timing and fit new points and condenser..  |
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hi im new to the forum and been recommended here for help and join in with you guys,.
help..... first of all i also have a 19mm carb fitted and jetted to the 125...i havent adjusted the timing...could that be it?
