Honda CG 125 Engine full rebuild itself at Home

I appreciate your love for your father and you did great job by restoring your fathers motorcycle

now regarding the project you did it yourself that is obvious you must be trained mechanic else
how can some one take decision & tear up cg engine and rebuild

i want to know more details about your project can you give more details about this work
what parts you had to replace as engine is very old and mileage is very long and from how
long bike was standing useless in garage and this must be 2nd or 3rd time engine opening as
mileage told by you is very long 270k km

and can you tell me about condition of centrifugal oil filter how was it? was it completely full
of sluge or some sludge only

I am also curious about this centrifugal oil filter, the manual says to have it cleaned after 12000km, but mine has done 35000km and the clutch cover has never been opened. Now i am thinking to get the oil pump and oil filter cleaned as it might be overdue but i am afraid of taking this risk as currently the bike is not giving me any problem whatsoever just that the oil seems to be getting quite dirty.

i am interested in this centrifugal since i had pridor and i ask from mechanics about centrifugal
mechanics say there is not really need of cleaning it i have asked 2,3 mechanics which includes
honda antenna mechanic i have asked honda mechanic when i saw a pridor with over 20k mileage
its right crank case wise opened for clutch plates replacement mechanic told me centrifugal filter is
clean and that time he had said there is not really need of cleaning it i have opened several engines
but mostly it comes out clean no need of cleaning it another mechanic who is in my city known for
125 work he says same no need of cleaning it

what i have learnt from search over internet there is not need of cleaning if owner changes oil on time
but if oil change is skipped and oil came out dirty than this centrifugal oil filter should be cleaned

Currently i am owning cg dream i have been facing an issue with my since i have bought it used 1800km driven
its techometer cable seal is leaking honda mechanic suggest right clutch crankcase cover needs to be open to install
seal as bike was very new i did not want crankcase cover to open i found another mechanic who replaced seal without
opening cover new seal worked for 3-4k km again it leaked now again i have done same from same mechanic but this
time just after few hundred km its again leaking this time i am thinking of going to honda mechanic and get it installed
by removing clutch side crankcase cover but i thinking of getting it done at 12000km as i personally want to see the condition
of centrifugal filter and solve this mystery of centrifugal oil filter this will give me good idea and good experience on
centrifugal filter

waise its not big deal cleaning it but the kinda mechanic here we have that is why i hesitate as they will try to play with other
things uselessly when they will open crankcase cover baaqi process of accessing centrifugal is not very tough

and yeah on my recent conversation with honda mechanic he was saying centrifugal filter should be cleaned after 12000km
why i don't recommend as people don't agree for this he was blaming bike owners now lets see what happens i have decided
i will go to honda mechanic and will get this job done as bike touches 10 or 12k km on odometer

biggest doubt have in mind are as we normally see once crancase covers are open we see oil spots on seals
i talked about this with honda mechanic i said to him if i replace crankcase cover seal or gasket will it leak?
he said if you replace seal with new you would not see oil spots

and now recent confusion has created in my mind after watching few videos centrifugal oil filter when is opened
this is another gasket inside it i am thinking will it be available in market well it should be available i will confirm
first else i think its not wise to get centrifugal filter opened

and laala jani kindly share your thoughts and experience on centrifugal what is your experience
as you are mechanic yourself you can guide better best

Awesome.And your thoughts-MA much appreciated.

nice, one of the easiest engines to work on and the more nicer part is that this engine is built so solidly it shows good performance when redone.

A rule of thumb of good motorcycle engine rebuilders is to never use the original philips head or the soft metal hex head screws that the engine has, Replace them all with socket head (allen head) screws - that way you can torque them down evenly and squarely.

Another issue sometimes that I came across was bad cast oil holes in the piston oil scraper ring gallery, I simply drilled them out and finished the surface with an oil stone.

The best repair on this engine is done if you make sure the valve seat width is done correctly by testing with prussian blue (aka gear ki ink in Pakistan). The valve cools down from the seat.

Philips head screw are a big joke seriously what were honda engineers thinking that they going to assemble kitchen cabinets

btw Off topic questions sir can you give tips to cleans engine canck case side cover a.k.a palle of CG 125 and can you share part no of old cg carb that use to come in pointer model

To @op nice work

philips head screw cast from cheap metal are less than half price of socket head screws. Accountants win.

for cleaning - strong powerful soap solution and good set of brushes and patience. For ultra quick work, soda blasting is best.

for extremely good finish that almost looks like fresh cast metal - hydroflouric acid solution, be very careful it can pull calcium out of your bones.

@xulfiqar SIR CAN U SUGGEST ME MODS FOR CG 125 FOR BETTER ACCELERATION AND FUEL PERFORMANCE . I HAVE HONDA CG 125 2008 AND PROBLEM IS THAT IT DOES NOT REMAIN AT CONSTANT RPM WHEN U RACE IT AND LEAVE ACCELATOR, BIKE GOES OFF.

A Son's Tribute to his beloved Father.....Keep it up bro...You did it