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

Yes, the head is made by sunbeam auto ltd(sal).
Valve lapping tool is available for Rs.8/- here in Hyderabad but it is useless. The valve is small for the suction cup to fit.
Cheap and best alternative is to use a carburetor's petrol tube/overflow tube/hose. It holds the valve stem tightly and doesn't slip. You can hold the tube in your hand and turn it like a buttermilk churner.

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

Place a small amount of fine valve-grinding paste evenly around the face of the valve, keeping it away from the valve stern,place the valve in its guide and, by means of a suction cup and handle, rotate the valve back and forth a few degrees on its seat, using a light pressure,raising the valve frequently during lapping and turn it to a new position after a few lapslap only until a continuous but narrow lapping mark is obtained on both the seat surface, then check for correct seating the valve face can be given light coating of bearing blue.

The width of a valve seat is important,narrow seat is desirable to give a good seal, while a wider seat is needed to transfer heat from the valve head to the cylinder head. A compromise is therefore necessary, with the intake valve seat usually being narrower than the exhaust valve seat
most of the engines valve-seat widths areIntake valve 1.5 to 2 mm
Exhaust valve 1.8 to 2.5 mm
So because the technicality involvedin this job most of the mechanics send the head to the lathe guys

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

Who said others have aluminum bores, the casting are of aluminum, but the liner is of steel. No bike except R15 in india use aluminum as bore.All bikes have steel liners and nothing else. In splendors it lasts so much because of the quality of materials used and also the smoothness of power delivery which extends the life of bore.LML scooters then leave those as those had epitome of quality which now a days we do not find. They say competition is good and yes they did as India saw lots of bike, but it is this competition that eat up quality as everybody is engaged in getting more features at less price. Even in those days LML scooters cost rs.5-7k more than chetak. Have you ever ridden LML NV spl with the express 5 engine. That engine was 5 port one with reed valve. Had so much torque and power that it was a hoot to ride. LML scooters will be smooth at even 80 kph and feels like ridding a bike. Then there was select 2 with two extra lights near the front apron and had self start. That scooter light can still not be matched by all DC equipped lights of today. LML NV and Select 2 had so good light intensity and spread that none can match it today. Moreover try catching a LML 5 port scooter on a 200 cc bike in city. Chances are that you will not be able to go near him. LML that thing is just not there today. And now do you think competition is good.Man lords of bike!, just too much praise to digest.Ok coming to back, boring is not bad as they make out. You will be surprised to hear that boring gives better performance than new bore. But the thing is that todays Lathe operator are just young guys who do not know anything. At the most they will be helper at some place for 4-5 years and then will open a shop of their own. All those experienced old men are either too old to work or some have passed away. Those men had so much experience and skill in their hands that Just by looking at the bore they can tell the size. I am going to tell you such stories in another post, but for now let me tell you that those men are no more who can beat the best companies with their hands.Who said crank last 75-80k kms. A original crank from factory will last anywhere from 1.25-1.5 lacs if timely engine oil change is done and no lugging the engine or riding clutch is done. Even when you are repairing the crank never give it to lathe as they damages the crank. Instead go for new crank as new crank cost Rs. 2400 but repairing will take rs. 1400. With new crank the new bore life also gets extended and easily that bore and crank will clock 1 lacs kilometers. Rebuilding a crank will decrease its life and also bore. No i have changed to new crank and bore and i will upload the sound soon for all to listen.Valve lapping is best done by hands as high speed drills used by lathes damages the valve seat and valves by removing too much of material and also by generation of excess heat from rubbing. My mechanic always insists on hand lapping and only those customers who insists on valve lapping at lathe he sends it to lathe.In next post will post some good quality artisians( They cannot be called mechanics as it will be a disrespect) stories and how they worked.

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

What's the life of rx-100 stock cylinder and piston sibun sire, what i have heard is the max life is 55000kms and even if you take good care of the engine it wil last only 55000kms not more than that, and suppose you get your cylinder rebored to 2nd o/s then the life of this bore and piston is roughly 30 or 35000 kms.

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

Other than R15 which has a aluminum block with nikasil coated bore, almost every bike uses an iron liner. Some bikes use cast iron block and others use aluminum block but both of them will have a iron liner.

Bores with nikasil coating cannot be re-bored.

My contribution is nothing when compared to your's. It is you guys who have made this thread so much informative.

Working on bigger engines is totally different. Most of those engine can be re-sleeved easily and clearance doesn't matter that much(relatively) as they are slow revving engines.
If re-boring is done properly then it will last as long as a new bore. It all depends upon the quality of workmanship.

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

Thank you to @kusmaker [MENTION=53807]paul.1911[/MENTION] [MENTION=28527]sibun[/MENTION] [MENTION=29030]Pinaki[/MENTION] [MENTION=43108]shoeb2015[/MENTION] [MENTION=7005]Rohit[/MENTION]IIT

Amazing knowledge and explanations
I will get valve lapping compound (please name a brand and where to source)
And I will put a air tight suction cup small size from my mums glass table:P on top of her belan and then use it to seat valves:P (mom I hope dosent read, I am so fond of xbhp and talk about it so much she now a days opens the website a lot to see kya hai yeh xbhp! And says all bike dhaat and closes)

Also I will not take it to a lathe, if machines do such good work why are hand made things more expensive? A machine can never duplicate intricacies the way a thumb gifted human can. Diy I will

I will try to do all engine work myself now, after exama this is my summer work

Also, lml scooters are too well built hence they were expensive, lml has a 200cc scooter now its a 4t and makes 21nm of torque more than a lot of pulsars, apaches, extremes, hunks and even a cbr 150 and a yammie r15
And its just 55k rupees new!
And my father also had a lml sensation, pulled like a train....torque on demand.
Is there any way to harden a bore liner? Etc sonasnit lasts longer? Also after reboring how is a bore liner matched/sourced/strengthened?



divyansh....

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

Waxpol has valve grinding paste , it can be seen in one of the pics shoeb uploaded yesterday , instead of belan one just get a small piece of fuel pipe or drain pipe and fix on valve stem as shoeb said , i tried today and it is brilliant substitute for valve lapping tool.

There is a reason why hand built Nissan GTR has terrific performance for its price , it is completely built by hand so are Harley Davidson bikes . A human eye and experience is unmatched by any robot, but high selling bikes are produced using robots as it is fast enough.

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

Most of the best motorcycles or cars are made by hand like Aston martin, ferrari, lamborghini, the engines are made by hands, polished by hands, some of the best italian motorcycles like Bimota, Cagiva, and the very famous MV Augusta are still made by hands.Some of the bore liners are hardened by Selective laser case hardening, the hardening is applied to the port relief area of the bore of a cast iron, water jacket, engine cylinder liner to improve resistance to scuffing, which occurs due to the rubbing of cylinder walls with piston rings, case hardening of the selected area is done by using a traversed laser beam.

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

Any way to harden a new block say quick heating and cooling etc?

divyansh....

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

What you are saying is that heating the block to red hot position and then cooling it atonce by submerging the block in oil (also known as tempering), is it possible to coat the cylinder with molycoating, like the newages piston, mostly of which are coated with this hard material.

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

Rx 100 or for that any two stroke bike will have less bore life because of the fact that they are two strokes. The reason is that 2-strokes produces one power stroke in every rotation of engine, while a four strokes does the same in two rotations of engine. So the heat produced by two strokes are more and since they are lubricated by 2T rather than sump lubrication so they run at greater stress. Moreover RX series engine makes a lot of power for their engine size. So the bore life is less. The suzuki samurai made a modest 7.8 bhp and its bore ran for 1.5 lacs km or more. Ya that is the main point. Today people are fascinated that machine built is better but the known people know that none can match the expertise of Hand. Not only those exotic bikes and cars but take the example of our own desi bikes. As long their was more Human work complaints were less. But as machines took over complaints in new bikes are increasing. Fact is that My Joy has pampered me so much that even normal problems in my extreme looks like it is requiring more maintenance. Quick heating and cooling will only damage the block as it will harden but will make the block brittle. If you have read my previous posts that after re-building an engine we must stand it in idle for 1-2 hours with occasional rest to engine. Why do you think i said so. The main reason is that idling the engine for some hours and then letting it cool and then again idling and letting it cool, taking this for 1-2 hours makes the ring and bore seal and also hardens the bore and rings by repeated heating and cooling.

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

Yes sir you are absolutely right on the power of rx-100 it makes astounding 11bhp and that too in an air cooled engine, but despite making this much power i still feel the bike dosen't remain smooth after 70km/h speed, the best speed what i have felt is between 50 to 65km/h, at this speed it can cruise all day long.If we stand idle a freshly built motor for 1-2 hours as you have said without altering its running in between, don't you think the rings will just boil inside the cylinder, and that will harm the bore more,(pls do correct me if iam wrong) plus i have seen so many times that people keep idling there motors without any proper cooling devices like a fan facing towards the engine.

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

Hello all, have you noticed the 'chuck chuck' sound from the rear shock absorbers of our bikes when the rear wheel falls on potholes or bumps? I simply love that sound. So, when i roam in my passion for no reason, i make the rear wheel fall on the potholes and listen to the sound!!. Only in hero (honda) bikes the sound is audible. That too in 100cc bikes. What is actually happening there? Why dont that sound come from other bikes?

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

You are absolutely right, the sound is very sweet whenever a bike hits a pothole it makes 'puch puch' sound , it's not that this sound only comes from hero bikes, my bike still makes this kind of noise(although not that much) despite being 20 yrs old, i feel most of the bike fitted with escorts rear suspension this sweet sound, i believe it's just the rebound damping of the oil which makes this noise.

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

Jeswin sir
I am going tonreplace my rear shocks again,
You guys said that rear overhaul wont last 6 monts also still I did a diy and fixed them and they have hone bad already
I shoull listn to you guys more, can anyone suggest me adjustable rear shocks that splendour pro has I think? What is the price? And is their better shocks ssy in passion or hf dawn?
divyansh....