UTC

Molto Verboso
2015 MP3 500 ie Business
Joined: UTC
Posts: 1173
Location: Belgium
 
Molto Verboso
2015 MP3 500 ie Business
Joined: UTC
Posts: 1173
Location: Belgium
UTC quote
jimc wrote:
Huh? 95 RON is what Piaggio specify. Why use 100?
Because the higher octane is more resistant to pre ignition events which likely is what happened in your case.

Remember, 95 is specified as the miminum. Think of that number as a plan B when you cannot get the good stuff.

Also, higher grade fuels typically have more ingredients to keep engine internals clean.
@maksor avatar
UTC

Ossessionato
Gilera Fuoco 500ie
Joined: UTC
Posts: 4545
Location: Netherlands Olst
 
Ossessionato
@maksor avatar
Gilera Fuoco 500ie
Joined: UTC
Posts: 4545
Location: Netherlands Olst
UTC quote
GrPo wrote:
Since I can't find any in-depth case of installing a 500 ccm kit onto the 400 cmm engine, I guess I'll have to go with the expensive 400 ccm kit.

I'm not sure which cylinder base gasket I have to buy. I found three sizes:
0.4 mm
0.6 mm
0.8 mm.

Since I had 0.6 mm gasket installed I assume the head was already resurfaced once, so it's probably a good idea to take the 0.6 mm one?
no i've done lots of conversions with the 492cc it will become a 487cc you onlt have to make the piston fit so it wont hit the rod by shaving of 1 or 2 mm of the bottom where the pen sits
OP
UTC

Member
Piaggio MP3 400 LT i.e.
Joined: UTC
Posts: 18
Location: Slovenia
 
Member
Piaggio MP3 400 LT i.e.
Joined: UTC
Posts: 18
Location: Slovenia
UTC quote
Yesterday I put everything back together with new cylinder kit, replaced the oil, filter and coolant, I also bleeded the cooling circuit and .... it works

I needed to crank it for like 2 seconds for the first start (probably the fuel lines needed to fill...) and then it started. For like 10 minutes it worked a bit erraticaly - from 1200 to 1600 rpm and also stalled 2 times. But now it start instantly and idles steadily at 1500 rpm and does not stall. I went for a 20 km ride (not riding it hard - max 80 km/h with minimum throttle). Rides very well. and doesn't stall when coming to a stop. I checked the tube on the front of the airbox and it had one small drop of oil in it - probably from before... I also double checked for any other oil and coolant leakages and found none.

The only thing I don't like is the decel "pop pop pop". It's still doing that. Maybe it's due to a new piston and cylinder and/or maybe the ECU needs to readjust itself, because the battery was disconnected for like two weeks.
So far so good - I hope it stays like that.

One interesting thing I noticed when checking the timing - the intake valves fully close only after the piston already starts going back up a few milimeters (maybe 5 or 10). Didn't know that's normal - it's called valve lag

And also one other weird thing - when I had the head on the desk I set the valve clearance to exactly 0.15 mm. But when I installed it on the cylinder and tightened the nuts the clearance went to like 0.08 mm on two valves and to 0.12 mm on other two. Seems like the whole head gets warped when you tighten the nuts. So I readjusted them back to 0.15 mm.
OP
UTC

Member
Piaggio MP3 400 LT i.e.
Joined: UTC
Posts: 18
Location: Slovenia
 
Member
Piaggio MP3 400 LT i.e.
Joined: UTC
Posts: 18
Location: Slovenia
UTC quote
Today I went for a 100 km ride and it worked well. Not a single drop of oil in the in the tube on the front of the airbox. I hope it stays that way for a while
DoubleGood Design banner

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com


All Content Copyright 2005-2024 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0183s ][ Queries: 3 (0.0124s) ][ live ][ 313 ][ ThingOne ]