ET4 125 Leader engine refurbishing.
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Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Tue Jan 21, 2020 11:13 pm quote
Hi folks! This is my first post here and first of all i want to thanks for such a nice forum and a lot of great projects here!

I'm coming from a motorcycle world (mainly KTM) and this is my first time to work on scooter or Vespa ever. Friend of mine asked to do some job on his Vespa and in this case i'm learning by doing. Moped needed some love, weak/not working electric starter motor, kickstart mechanism damaged. He want's to change piston and IF the cylinder will be in bad condition than go for bigbore version.
[img][/img]

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Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Tue Jan 21, 2020 11:16 pm quote
Please confirm that this is Leader engine

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Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Tue Jan 21, 2020 11:21 pm quote
One of starter motor bolts is broken, will try to weld some nut and remove it.
Cleaned, greased and assembled kickstart lever and spring, somehow managed to do it without special tool and now it works perfect!

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Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Wed Jan 22, 2020 4:19 am quote
Before head removing checked valves, intake was bit tight, about 0.09 mm and exhaust bit loose (0.20mm)[/img]

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Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Wed Jan 22, 2020 4:25 am quote
Looks like piston rings was worn out, but cylinder looks in good shape.

IMG_20200122_120232.jpg

Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Wed Jan 22, 2020 4:29 am quote
Sorry, i'm still learning this forum and adding pics is harder to work on engine itself!

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Ossessionato
LXV 150 3v ie. Midnight Blue (Sold)
Joined: 06 Dec 2010
Posts: 3363
Location: Bangkok
Wed Jan 22, 2020 10:12 am quote
Cyliinder surface looks OK.
Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Thu Jan 30, 2020 9:44 am quote
Piston cylinder wall clearance
Hi guys!

Today measured a cylinder bore in shop with right tools and now it's time to order a piston. i haven't any experience with such a small bore engine and i the clearance about the same as larger bore engines (0.060-0.070mm)?

The cylinder bore is 57.050mm to rear-front and 57.020mm side - side.
i guess piston should be about 56.980?

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Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Thu Jan 30, 2020 10:05 am quote
Measures

IMG_20200130_200206.jpg

Member
Vespa Gt 200 '03
Joined: 20 Jan 2020
Posts: 15
Location: Hungary, Pécs
Mon Feb 03, 2020 4:19 am quote
endurists wrote:
Please confirm that this is Leader engine
Hy!

Yes, it is a leader engine
Molto Verboso
S 190. Custom VNB 150
Joined: 04 May 2009
Posts: 1468
Location: CT
Wed Feb 05, 2020 9:14 pm quote
Good looking pics.
Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Sun Mar 29, 2020 4:15 am quote
Moped owner ordered new piston and it finally arrived with some gaskets and brake cable. The problem is: the new piston pin is 14mm diameter, but old one 15mm! Is it from some other generation et engine?[/img]

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Enthusiast
Derbi Boulevard 125 4t
Joined: 05 Feb 2020
Posts: 57
Location: Lithuania
Sun Mar 29, 2020 11:52 pm quote
Pre-Leader piston?
Member
KTM LC4 Adventure, Husaberg FE501
Joined: 14 Jan 2020
Posts: 13
Location: Latvia
Wed Apr 01, 2020 11:01 pm quote
isdeekelis wrote:
Pre-Leader piston?
Hi (labas rītas )

Could be, but as i said this is my first time in to Vespa engine and piston was ordered by owner!

I installed the new rings and circlips on old piston, because owner have no time
for another piston order. Somehow already this order took about 6 weeks to get it!

Already put the cylinder and had back to engine and according to manual head bolt torque is 16Nm + 90 degree, is it ok? seems no so much!

My 500cc motorcycle had to torqued till 50 or 60nm
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38604
Location: Pleasant Hill, CA
Mon Apr 06, 2020 3:00 pm quote
16Nm +90° is correct.
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