Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

[MENTION=28527]sibun[/MENTION] sir
As far as I know aplendours have steel bores and other bikes have aluminium bores, thats why they last so much right?
Crux also has a steel bore I think. Only these two bike do.
And all lml scooters had steel bores thats why you see them still running around
Anyone has contacts with anyonw who can make me a steel block and piston?

divyansh....

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

[MENTION=28527]sibun[/MENTION] everyone calls you sir because you are the lord of bikes, a silent guardian, a watchful protector.

okay enough OT, I'll get the diamond kit today, the push rod rubber and timing chain comes as a kit only. thats what the seller told me. so i got it.. its okay right?

also he was asking me to get a new bore kit, I told him I'm going to do re-boring and he was like its a waste sir re boring wont help you, you should get a new bore kit. I politely said no I will get it done myself thank you.

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion


Hahahah that means sibin sir is the dark knight
Now,
Reboring sometimes is a waste because
Local mecs measure less and screw up more. Lathe jobs are not always upto the mark, And the bore lining is not hardened after the reboring .
You bought the oversize piston and rings?
Someone heare should do a big 150cc bore and piston with polished head and bigger valves and maybe a higher compression splendour:P
Hell I would do it of I had the tools and a little more knowledge and moolah.

divyansh....

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Yes I was quoting the dark knight quote

you were going to do an engine overhaul no? how are you going to do it? new bore kit or reboring?

No I haven't bought piston/rings and other stuff. just clutch/pressure plate/ sprockets as of now..

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

I live near industrial estate of my city and here boring and lathe jobs are daily bread and butter for many shop owners , massive cylinders of trucks , JCB and trailers come for reboring or lathe works, The size of blocks is massive and lathes are even bigger , i asked a guy to clean head of my splendor , as he is expert in lathe and working since 15yrs , but he said that they dont work on bike engines as they are small for equipment they have there , plus slight imperfection will destroy the bore , said that he guided me to another person who bores cylinders of bikes , he says there is no guarantee that boring job will be perfect , it can be very perfect or very bad , as old bore's characteristics change. A rebore can result in better bore or a worse one , so it depends upon who and how he bores , a new bore will atleast give peace of mind .

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

I will advice you to go for a new bore when ever ypu do so
My compression is not totally lost and bike is not consuming oil but after 80k kms the piston rings are worn so I will get new rings only.


divyansh....

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

The push rod rubber & timing chain does come separately. Each and every part you can see on timing kit are also available separately. Its ok if get it, buying a kit cost less compared to buying separately. But seller has lied to you for sure.

Don't get a new bore kit. People says lots of things that rebore doesn't last. But it last a lot if done correctly.
From our experience it has been estimated that a crank last at an average for 75k. 80k would be its end of life. As your bike had already done 50k, so your crank will no longer last than 30k more. My crank was gone 70k kms. So if you get a new bore kit your crank will damage it then you will have to again buy a new kit. If you go for re-boring it will cost less also it won't hurt if it damages after such conditions. And then you can go for buying a new kit. [MENTION=28527]sibun[/MENTION] correct me if I'm wrong with this crank part.

read this useful post http://www.xbhp.com/talkies/motorcyc...tml#post830253

If you are up to doing yourself then better find a best lathe. And get yourself with a feeler gauge. Once a re-bore done check the rings gaps by placing into the cylinder. It should be 0.2 mm only. 0.1 mm is also fine but I would not suggest keeping 0.1 as the compression will be more and it will put more pressure on crank shaft hence reducing its life & chances of failure will be more sooner. 0.2 mm is a standard gap that comes in USHA bore kit. Hero is now supplying USHA as OE kit.
So as per my suggestion re-boring option is a good to go...

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

[MENTION=53807]paul.1911[/MENTION] I wont be doing it myself because I don't have the knowledge like you people nor the experience.. I've started to learn now only, will take years to reach to do it myself

I will give it to my local mechanic. Should trust him only on the re-boring job. I hope he does it properly.

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

No one is born with experience. When I joined xbhp I had zero knowledge & zero experience and I did first engine de-carb in 8 months and complete engine overhaul within less than a year...
So you can also do it, its all about dedication and how much effort you put...

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Experts I have a question
Valve lapping and seating can be done with valve lapping compound.
Why does my mech keep talking about lathe work when ever I ask him I wil have to replace valvesnalonf with bore and piston
He says lathe work will be needed.
For what?

divyansh....

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Lathe work is needed for valve lapping. They didn't use any machine for lapping it is done by hands. And only lathe guys do this. Mechs didn't do of their own because they don't know how to nor they ever want to do. They just leave that upon lathe to do that work to reduce their own work load.
Sometimes seating/mating surface requires cuttings at different angles this happens when seating is too low or too high. Cutting is done by cutters that come in different angles until we get 40' degree angle slope.
The seating surface changes due very long term opening & closing of valves at higher speeds that eats up the valve & mating surface. So when new valves setup requires the mating surface changes that requires lathe work to be perform so they make the valves properly seated in its place to ensure no compression leaks.

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

What lathe means is , when you are installing new valves , he puts small lap compound and grinds so that new valve, seats perfectly with existing seat , also all works in lathe are done together like cleaning , grinding, removal etc so it is bit economical too. Valves are lapped when running is low due to which it seating is not proper , so we apply lapping compound and lap in one direction , valve is replaced when it develops play and leakage is evident , experts please comment and correct if wrong

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Mechanics send the valve seating job to lathes because they don't want to take the time and care to do it themselves or more plainly don't know how to . Most lathe ( metal workshops ) use fast rotary tools to grind the valves and seats to match - taking out too much of the metal and hardly caring for the seat angle . Perfect valve seating should only be done carefully by hand with hand tool . Then tested for leak overnight .

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

I had lapped these valves for Ravi@17bhp's Karizma .


See the results and decide which one is better.
Left- Exhaust valves lapped by lathe . I did not take a picture of intake valve.
Right- intake valve lapped by me.



Both the valves lapped.



Exhaust valve and seat were damaged by lathe. The rotary drill created circular grooves.



Both the seats lapped.


Additional Pictures-

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

[MENTION=14414]shoeb[/MENTION].2015 Is it a SAL block ? i see sunbeam engraved on edge , Where do we get the vaccum stick kind of tool used for lapping most of the auto part owners were clueless on this . What do we actually call that tool ?