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Gilera MXR-> power tuning
Posted: Thu Feb 28, 2008 4:14 pm
by Kic
Hi!
i had bad luck with the crankshaft a few days ago so i decidet to make a full engine rebuild with the maslossi 168cc kit!!, new crankshaft, bearings, gaskets, oil rings/seals, crankcase, cylinder and piston matching/polishing, iriduim spark plug, new drive chain, carburator, air filter, and maybe a new end can.
Some pictures:
here are samo pictures of the crankcase porting:
i need inforamtion about the carburator... the best one for this setup is?
also, will it work properly (in the sence of good mixture) on the olad PHBH 28, and whitch jets shuld be fited?
greetings from croatia!
Carburetor Malossi for Gilera Kit APTS 168cc.
Posted: Thu Feb 28, 2008 5:45 pm
by gileraXR1
PHBH 30 on eBay!
Posted: Thu Feb 28, 2008 5:55 pm
by gileraXR1
Posted: Thu Feb 28, 2008 9:20 pm
by Kic
TNX!
So 30-34 are good, i can get a VHSB 34 from aprilia AF-1 cheep!
It should work!
Posted: Thu Feb 28, 2008 10:20 pm
by oekotopia
Hi,
the diametre of the carb should not be bigger than the
diametre of the inletchannel.
Georg
Posted: Wed Mar 05, 2008 9:06 am
by Kic
update!
decided to leave the stock cylinder!
new piston rings (prox for suzuki RG 250), crankshaft with bearings, side bearings (C4 for the flywheel side, and C3 for the clutch side) originally meant to be C5 and C4 but C5 is tough to find...
also there is a complete set of gaskets and oil seals.
and on top of all roughly about 7 hours of work on porting, polishing and matching...
here are some pics:
Posted: Wed Mar 05, 2008 9:15 am
by gileraXR1
Kic wrote:update!
.......crankshaft with bearings, side bearings (C4 for the flywheel side, and C3 for the clutch side) originally meant to be C5 and C4 but C5 is tough to find...
Hi Kic!
If you want I've a new C5........
Tell me if you are interested....
Have a nice day, and good job!
Ciao
Marco
Posted: Wed Mar 05, 2008 10:21 am
by Kic
thanks gileraXR1
but i think this configuration (c3/c4) will last longer
Posted: Wed Mar 05, 2008 3:28 pm
by gileraXR1
Kic wrote:thanks gileraXR1
but i think this configuration (c3/c4) will last longer
Hi Kic!
Uhm...... are you sure?
Why? 
Thanks a lot!
Ciao
Marco
Posted: Wed Mar 05, 2008 3:37 pm
by Kic
the marking C3/4/5... marks the distance between the bearing rings and the bearing balls, bigger the number -> the clearance is bigger, meaning less friction but shorter life of operation
hope you understood, sorry for my broken English
Posted: Wed Mar 05, 2008 4:05 pm
by gileraXR1
Kic wrote:the marking C3/4/5... marks the distance between the bearing rings and the bearing balls, bigger the number -> the clearance is bigger, meaning less friction but shorter life of operation
:
Hi Kic!
Ok, that's right, i know the difference between C4 and C5..... and I know about bigger radial clearance between C4 and C5....
Just this: be careful, remember that engine and bearing became hot... red-hot!
A different bearing clearance can cause damage in short time at your engine......
Just this.....
However: C4 on clutch side crankcase and C5 on flywheel side crankcase.....
Good luck!
Kic wrote:hope you understood, sorry for my broken English
You english it's very good!
Have a nice day!
Ciao
Marco
Posted: Wed Mar 05, 2008 4:16 pm
by Kic
all other 125cc engines (NSR, mito, TZR, rotax, YZ`s) have c3 bearings, never had any problems whit that, gileras have the same conception so doubt i will have any problems here.
Posted: Wed Mar 05, 2008 6:27 pm
by gileraXR1
Hi!
OooooK!
en. That's right....
it. Va bene!
Good Job!!!!
Ciao
Marco
