engine

piaggiowill · Derestricted Danger Joined: 03 Mar 2009 Karma :

Hi all i have fitted my new engine and had it checked by the garage to make sure it was fitted ok, now i have rode it for a day and the revs die out in between half revs and full revs but then it keeps the revs on at full throttle but isnt goin fast then all off a sudden it just picks up speed, but then after five mins off riding it doesnt die out but when you stop for traffic lights it takes ages to build speed up again and i mean like 5mins. could it just be shit in the carb like the bloke from the shop said or is there something else ?

ringer · Two Stroke Sniffer Joined: 05 Mar 2009 Karma :

Sounds very much like fuelling problems. Suggest you remove carbs, strip them down and clean them. Take care stripping them down - watch out for how springs etc are attached. Take lots of digital photos as you go. Blow air through the jets - whatever you do don't poke at them with a bit of wire or needle!
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Suzuki GT250 (stolen 1980), Kawasaki H1 500 (blew up 1982), Piaggio Liberty 125 (since 2008), Moto Morini 500 Strada (since 2008), CB125T (in bits)

Vincent · Banned Joined: 16 Oct 2006 Karma :

piaggiowill · Derestricted Danger Joined: 03 Mar 2009 Karma :

hi all i have stripped the carb down and cleaned it, it is still running as bad, i am just wondering what else it could be ?

ringer · Two Stroke Sniffer Joined: 05 Mar 2009 Karma :

Although I still think it will be a fuelling problem, let's eliminate other possibilities.

Buy and fit a new spark plug and plug cap - won't do any harm and will cost less than a tenner.

What you riding (I assume a Piaggio of some sort) and how old is it?
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Suzuki GT250 (stolen 1980), Kawasaki H1 500 (blew up 1982), Piaggio Liberty 125 (since 2008), Moto Morini 500 Strada (since 2008), CB125T (in bits)

piaggiowill · Derestricted Danger Joined: 03 Mar 2009 Karma :

ah right ok thanks Smile

yeh its a piaggio zip 5 2stroke 2001 model with a 2004 engine Smile

Danzio · Nova Slayer Joined: 01 Oct 2006 Karma :

does the bike have a manual choke? if so turn it off Laughing

i was young and dumb once and forgot to turn my manual choke of on the nsr....wondered why it kept konking out at traffic lights, and when i pulled the throttle fully back...!

ah well!

:EDIT: this wont have a manual choke so forget what i said and put it down to random blethering....

piaggiowill · Derestricted Danger Joined: 03 Mar 2009 Karma :

im just sick off it now, got the carb cleaned and put back together and then started it up and it run with no revs but then when i increase th revs up it runs fine at half revs but then dies at full revs and starts backfiring a little, i had the compression checked at the garage and it was at 115 so its got enough compression, i have also changed the spark plug and its still the same.

ringer · Two Stroke Sniffer Joined: 05 Mar 2009 Karma :

Good you fitted a new plug. For the sake of a couple of quid, fit a new plug cap too.

Next to check is timing - particularly advance mechanism (if a scooter has one) if it's not running right and backfiring at higher revs. Although I too have a Piaggio have been unable to get covers off so not too familiar with ignition setup.
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Suzuki GT250 (stolen 1980), Kawasaki H1 500 (blew up 1982), Piaggio Liberty 125 (since 2008), Moto Morini 500 Strada (since 2008), CB125T (in bits)

piaggiowill · Derestricted Danger Joined: 03 Mar 2009 Karma :

hi all just a update,i took the carb off cleaned it out and checked the main jat and it only had a 52 in so i took the carb off the old engine and took the main jet off that and its got a 72main jet o put that on and it seems to be working fine. cheers for the help guys Smile