Re: Honda Unicorn

Sorry to hear it mate....I read your last few posts and my thoughts are as below:

1. Kind of damage seen to various engine components of your bike, mechanic should have diagnosed why all these components failed at first place ? Reasons could be many including fake engine oil, insufficient oil circulation inside engine, faulty engine oil pump, running too lean mixture.

2. I never heard kind of running presrcibed by mechanic for your bike ie keep engine running for 30 mins,1 hour. When bike is not moving and engine keeps on idling it just creates too much heat for engine parts to bear and IMHO this could be reason for second failure of piston. Our bikes being air cooled NEEDS constant air flow to keep it cool.

3. Last, your driving habits. Make sure you do not LUG engine. More damage can be done to engine if it lugged rather than ripped. Running in bike too much gently is big reason for engine failures in cases where bike owners claim they did not drive rashly. Give engine variable loads and it will serve you for ages.

Re: Honda Unicorn

What grade of engine oil works best for unicorn ? 10w30 or 20w40 ?

Re: Honda Unicorn

20w40

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Re: Honda Unicorn

well thanx a lot for your wonderfull tips.
as my driving is concerned I don't ride harsh well 40-50 speed is my limit I like to maintain that.
For the run in period yes I keep the bike under 4000 rpm. At what ever speed not more than 50.
Well even I don't know why the mechanic had told me to keep the bike ideal for 2 hrs in the evening and 1 hrs in the morning well that could be one reason.

For the engine oil I got it changed exactly after 350 km of the first repair of the engine till then there was not sound as the bike was running under 40 - 45 speed.
Well after few more km like 450 when I started giving it a throttle above 55 the sound was there but very slow when later on as the km were going on the rise the sound was also increasing day by day and today it has reached to its peek. Well one thing I like to mention here to all my xbhians i.e. When taking the vehcile out in the morning or after a ride like 1 hrs there is not a single sound what speed u ride her but exactly ones the engine is fully heated up oh! My god that sound comes back. The sound is like something it hitting the engine badly.
I will be checking the engine oil tom... And give u my feed back for the same.
the engine is not lean I am getting 48 km/ltrs in city.
The color of the spark plug is little bit white and brown.

Further lets see what the dam engineer decides to do as god save them from my hands after all they have made the vehicle and not me.
Shall keep you all update for the same and also if you all have any points for me to know ones the work is going to take place on this 24 please do share I will be taking my notes to check also like the rod to check the piston rings and everything are placed and oh god I am in a mess and tired I have told the dealer also about the workman ship of his staff for which he has said that not to worry it will be ok. Well they r speculating it might be a faulty piston from the company more over I feel on this he wants to save his staff skin.

Re: Honda Unicorn

What brand and grade of engine oil you have changed?

Re: Honda Unicorn

Well the best suited for me is motul 3000+

Re: Honda Unicorn

I am using company engine oil 10w30. Why????

Re: Honda Unicorn

My comments in bold. My recommendation is to first know why piston is failing again ?? I do not suspect brand new piston to be faulty, they are forged in highly accurate machines these days.

Re: Honda Unicorn

Centrifugal filter is to be cleaned only when the gearbox is opened if I'm not wrong

Re: Honda Unicorn

No bro, I have Honda Twister and manual mentions to clean Strainer Screen and centrifugal filter every 3000 KMS( ie service interval )

Re: Honda Unicorn

Had been following your updates for a few days, it's bad to get such problems. Is the "engineer" you mention a employee of Honda or is he affiliated to the dealer?
Would like to share my experience with the dealer. My original octroi receipt was lost by the dealer and whenever I inquired (Invoice date: 29/5/10), the reply I got was to wait for 4-5 days. I dropped a mail to HMSI and called them at their regional office (Got the duplicate receipt delivered at my doorstep in 1 day, date: 22/6/10). But this whole procedure consumed about a month n my bike was almost idle for that time. Later at each free servicing had to fight with the dealer as I counted the first service one month from 22/6/10 and they counted it from 29/5/10, but each time a call to HMSI regional office and I got my free services done according to my schedule.
I suggest you drop a mail to HMSI, this will act as a written proof of what you are enduring. chk Honda

Re: Honda Unicorn

Then just fine. Your symptoms may occur if we use xxW50 OIL in Unicorn engine.

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Twister manual mentioned every 6000 kms for strainer and every 12000 kms for centrifugal filter after first service at 750 kms. But we can safely do both together at every 12000 kms if we change oil at every service.

Re: Honda Unicorn

Yes the engineer is from HMSI HONDA Mr, Puneet San. He himself has seen the vehicle and heard the noise which is coming from the engine and after hearing it he said to arrange for the parts the entire blog. Wow you have a good history well my service receipts i mean to say my paper work is very strong so no problem even my manual book the entries of the service with signed by them is there. I am waiting for the last and the final time as he has asked me time for the same then I will shoot an email to the company for it.If the problem does not get solved.

w50 in honda unicorn the bike will be ripped apart after few km. No way.

I believe you are mentioning to this strainer which is inside the clutch box


1. Its fine you didnt ride harshly....but are you sure you did not lugged engine....driving at low speeds in high gears ?? This type of driving is worst than harsh riding.

( yes I dont ride the bike harshly at any cost and specially on a new engine. no I did not lugged the engine in any manner I was riding it at 5 gear keeping the bike at 40-50 speed but yes under 4000 rpm. is this a bad riding habbit please guide on a new engine..

2. This type of running in was prescribed my mechanics in 2 Stroke scooters....I remember my father to keep scooter running for hours after engine repair. This is not at all recommended for our bikes.

yes for this point even I was not sure but this is for the first time my engine has gone bad over so many bikes change and experience so I was going what I was told by them. Ones the engine is been made again this process will not happen this time for sure, as I have lost my patience going to the workshop for them to understand and do experiment on my bike with the engine.

3. Buddy, do get bike's oil pump checked first before any engine repair. Normally its part of every service schedule to check oil pump and oil circulation to various engine components. But I never saw any mechanic checking it. Also, Honda bikes do not have oil filter that needs to replaced every service. Instead they have Oil strainer screen and centrifugal filter ( mechanic knows it as rotor filter ) and these needs to be cleaned evry alternate service. Do get them checked too, as any blockage in these filters can restrict oil circulation in bike.

well i doubt on this if the mechanic would be knowing any word like oil pump? as for the oil stainer are you mentioning to the picture I have just shared in this post.

using 10w30 Honda oil & it is a good oil

Re: Honda Unicorn

well friends you will not believe what i learned today the blog which was changed earlier was of low cost quality and the mechanic new it that the sound will come again in less than 1000 km. He also had informed it to the owner for the same. Is this the kind of so called quality product honda is supplying.

Re: Honda Unicorn

Report it to honda