Is it possible to upgrade a 98 engine (1970 seigorni (just the road version unfortunately) apparently) to 124cc ?
I know the early series had a lot in common and it looks as if you should be be able to swap in a 124 cylinder, piston and head (ignoring balance factor). I know about the 13.5 and 15 piston pin variants but until I lift the cylinder I don't know which this will be. Is it simply a case of the later ones being 15, and if so from which year? The stroke is the same and piston height as far as I can tell.
Would the 98 cylinder stand boring out to take a 124 piston but use a 98 head? Given it's a hemi head design presumably not.
I know 124s must have had a different head as the valves are bigger.
This 98 has a cast iron cylinder not alloy/iron sleeve so I'm wondering if someone may have put a 'lesser' or earlier engine in (number starts with 001). Though it has a Dellorto ME18BS carb not the 16 that it seems the early 98s (1962 at least) used.
It needs a rebore anyway so just exploring options if it is already beyond maximum usual oversize for a 98.
Giubileo 98 to 124 conversion
Moderator: Joachim
Giubileo 98 to 124 conversion
1956 175 'Sport' , 1993 125 GFR
"Do not adjust your mind there is a fault in the reality"
http://www.gilera.org.uk/GeN (NEW HOME!)
"Do not adjust your mind there is a fault in the reality"
http://www.gilera.org.uk/GeN (NEW HOME!)
- Joachim
- Gileristi
- Posts: 11192
- Joined: Tue Dec 31, 2002 9:10 pm
- Location: Zweibrücken bzw. Landau/Pfalz
- Contact:
Re: Giubileo 98 to 124 conversion
Hi Pete
looks like you have to stay with your titanic 6HP
I have copied the article to the more Oldie related part of the forum.
Maybe....
ciao Joachim
looks like you have to stay with your titanic 6HP
I have copied the article to the more Oldie related part of the forum.
Maybe....
ciao Joachim