Since '02 xBhp is different things to different people. From a close knit national community of bikers to India's only motorcycling lifestyle magazine and a place to make like-minded biker friends. Join us

Axor
Magazine
Castrol Power 1

Hot days = molten tar = slip/slide.

Our Partner

Announcement

Collapse
No announcement yet.

Honda Unicorn

Collapse
X
Collapse
 
  • Page of 34
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 15 20 21 22 23 24 25 26 27 28 29 30 34 template Next
  • BlackPanther
    replied
    Re: Honda Unicorn

    Thanks to dude_creative who encouraged me to do the centrifugal filter cleaning.

    I have not performed this in the last 48500+ Kms.

    All i need was a couple of size spanners (11 & 13 maybe) to loosen the clutch wire, size 10 spanner (or 12) to remove the kick start lever, size 8 T spanner to remove the clutch side case, a lineman's plier, new gasket, blade or a flexible knife to remove the existing gasket and sealbond (rubber paste). I had to remove the foot rest as well so that I don't have any hindrance.

    Click image for larger version Name: IMG_20160123_115126.jpg Views: 1 Size: 97.3 KB ID: 1928393

    Click image for larger version Name: IMG_20160123_121651.jpg Views: 1 Size: 109.4 KB ID: 1928394

    Click image for larger version Name: IMG_20160123_121710.jpg Views: 1 Size: 107.3 KB ID: 1928395

    Click image for larger version Name: IMG_20160123_130929.jpg Views: 1 Size: 101.2 KB ID: 1928396

    Also my Unicorn started smoking (sometime black and sometime white) with reduction in oil level. I now have to replace oil every 1000 Kms

    Even after tappet adjustment, i could hear a loud tak tak noice during startup. I did a rebore-valve replacements only at 37000 odd kms.

    Mechanic is suggesting to open the bore again. I will wait till the bike reaches 50000 and check the bore.

    Thats all for now.

    Cheers,
    Anand
    Last edited by BlackPanther; 01-26-2016, 09:08 PM.

    Leave a comment:

  • dude_creative
    replied
    Re: Honda Unicorn

    Originally posted by asn39 View Post
    Hello owners i am facing LEAKING OIL from engine head
    I think this happened after tappet adjustment i got done few months back
    What is advised to do ? I have not faced any issue yet and i wish to not touch engine as its running fine
    Valve cover gasket needs change, Or use Anabond sealant over the gasket and reassemble.
    Post picture exactly where it leaks.. hope it is from the topmost cover

    Leave a comment:

  • asn39
    replied
    Re: Honda Unicorn

    Hello owners i am facing LEAKING OIL from engine head
    I think this happened after tappet adjustment i got done few months back
    What is advised to do ? I have not faced any issue yet and i wish to not touch engine as its running fine

    Leave a comment:

  • metallica84
    replied
    Re: Honda Unicorn

    Thanks, that's really helpful.

    Leave a comment:

  • RohIIT
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by metallica84 View Post
    Okay, i did the tests yesterday evening and today morning and it gave negative results. However, i think i have figured out what the problem is. While tuning the carb i was being really conservative the the fuel input into the engine as i didn't want to compromise of my fuel efficiency.

    However, after the problem was not solved after repeated tuning, I decided to forget about FE and just tune. I got a stable rev rate at about 2+1/16 turns out. I rode for around 8-9 kilometers today morning on a cold engine and my problem has lessened A LOT. I start the engine on choke and run it for around 2 minutes. after that I started to ride. Initially there were a few slight hiccups, but within 500 meters or so everything evened out.

    What's more, the engine didn't stall in traffic, as it was doing previously.

    The thing is, during the summers, I was running a really lean mixture(3/4 of a turn from closed position) and I was getting more than 45+ kmpl.

    I guess I'm gonna have to forget about economy till the summers start...
    Glad to know problem has resolved to quite an extent. Also FE wont increase if you run lean mixtures .



    As you can see at at two point you get either max power or max fuel economy , but keep in mind that this is a theoretical graph and actual thing is different.

    So point here is when we tune and get max rpm or perfect tune, it will give us max efficiency as well .

    Leave a comment:

  • metallica84
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by RohIIT View Post
    Ok do these tests on hot engine , i remember i had similar issues like this and it was due to tight tappets . So after doing test if it gives negative results then we need to look in tappets.
    Okay, i did the tests yesterday evening and today morning and it gave negative results. However, i think i have figured out what the problem is. While tuning the carb i was being really conservative the the fuel input into the engine as i didn't want to compromise of my fuel efficiency.

    However, after the problem was not solved after repeated tuning, I decided to forget about FE and just tune. I got a stable rev rate at about 2+1/16 turns out. I rode for around 8-9 kilometers today morning on a cold engine and my problem has lessened A LOT. I start the engine on choke and run it for around 2 minutes. after that I started to ride. Initially there were a few slight hiccups, but within 500 meters or so everything evened out.

    What's more, the engine didn't stall in traffic, as it was doing previously.

    The thing is, during the summers, I was running a really lean mixture(3/4 of a turn from closed position) and I was getting more than 45+ kmpl.

    I guess I'm gonna have to forget about economy till the summers start...

    Leave a comment:

  • RohIIT
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by metallica84 View Post
    Vaccum leak from where?

    Actually the symptoms of the bike are not constant at all. The engine stalls when i brake, but very randomly and very rarely. Sometimes it shows no problems even after braking.

    Another thing is that when the engine shuts off on braking in traffic, it doesn't start even if I give it 100% throttle. I start it with the throttle closed, it starts off with RPM very low(as if the engine were cold) and then when i try to accelerate, it shuts off. Basically the same behaviour that happens when the engine is cold; but happens randomly and even though its hot.

    I will do those tests and update this thread tomorrow. Should I do the first test on a cold or hot engine?
    Ok do these tests on hot engine , i remember i had similar issues like this and it was due to tight tappets . So after doing test if it gives negative results then we need to look in tappets.

    Leave a comment:

  • metallica84
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by RohIIT View Post
    Yes i am sure, i tuned my unicorn also same way, You need to do this process slowly , i wrote it in my log that i failed 2-3 times before succeeding, also you cant try keeping afr screw 2 turns out and see the performance.

    Edit : I saw something in your previous post that , bike is coming to halt whenever you stop ?

    This is actually a symptom of a vacuum leak . So AFR tuning wont help at all.

    Do this , ON AN EMPTY ROAD !

    Test 1

    Take bike to 40kmph and brake hard ( Pull in clutch but DONT LOCK WHEELS )
    If bike shuts off then it is vacuum leak .

    Test 2

    On hot bike , twist throttle to minimal , like 1/16 of WOT ( just give it a quick turn )
    If RPM dips and shuts off , its vacuum leak

    Try these tests and revert
    Vaccum leak from where?

    Actually the symptoms of the bike are not constant at all. The engine stalls when i brake, but very randomly and very rarely. Sometimes it shows no problems even after braking.

    Another thing is that when the engine shuts off on braking in traffic, it doesn't start even if I give it 100% throttle. I start it with the throttle closed, it starts off with RPM very low(as if the engine were cold) and then when i try to accelerate, it shuts off. Basically the same behaviour that happens when the engine is cold; but happens randomly and even though its hot.

    I will do those tests and update this thread tomorrow. Should I do the first test on a cold or hot engine?

    Leave a comment:

  • Divya Sharan
    replied
    Re: Honda Unicorn

    Posts moved to the right thread!

    Pls. continue discussing,

    Leave a comment:

  • RohIIT
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by metallica84 View Post
    Okay, so I tuned the carb of my unicorn using the instructions given in your signature post. I removed the air injection pipe, closed the inlet with my finger and tuned exactly like you said but my RPM never dropped no matter how much i opened the AFR screw. The rate of increase of RPM decreased, but even after rotating it to 6-7 turns out, the drop in RPM is not happening.

    What do i do now?

    Are you sure the CBZ xtreme method of tuning can be used on the Unicorn?
    Yes i am sure, i tuned my unicorn also same way, You need to do this process slowly , i wrote it in my log that i failed 2-3 times before succeeding, also you cant try keeping afr screw 2 turns out and see the performance.

    Edit : I saw something in your previous post that , bike is coming to halt whenever you stop ?

    This is actually a symptom of a vacuum leak . So AFR tuning wont help at all.

    Do this , ON AN EMPTY ROAD !

    Test 1

    Take bike to 40kmph and brake hard ( Pull in clutch but DONT LOCK WHEELS )
    If bike shuts off then it is vacuum leak .

    Test 2

    On hot bike , twist throttle to minimal , like 1/16 of WOT ( just give it a quick turn )
    If RPM dips and shuts off , its vacuum leak

    Try these tests and revert
    Last edited by RohIIT; 01-11-2016, 03:44 PM.

    Leave a comment:

  • metallica84
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by RohIIT View Post
    Yes this one , Remove the rubber pipe and block the metal lower pipe which is fixed to intake manifold and try again .
    Okay, so I tuned the carb of my unicorn using the instructions given in your signature post. I removed the air injection pipe, closed the inlet with my finger and tuned exactly like you said but my RPM never dropped no matter how much i opened the AFR screw. The rate of increase of RPM decreased, but even after rotating it to 6-7 turns out, the drop in RPM is not happening.

    What do i do now?

    Are you sure the CBZ xtreme method of tuning can be used on the Unicorn?

    Leave a comment:

  • RohIIT
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by metallica84 View Post
    What's that little black box on the carburettor with 3 wires going into it, 2 yellow and one blue?
    Throttle Position Sensor

    Leave a comment:

  • metallica84
    replied
    Re: Honda Unicorn Dazzler

    Originally posted by RohIIT View Post
    Its Secondary air injection . Same section has that textile covered pipe that goes to engine head. Its function is to reduce emission and boost mid end performance.
    What's that little black box on the carburettor with 3 wires going into it, 2 yellow and one blue?

    Leave a comment:

  • metallica84
    replied
    Re: Honda Unicorn

    Guys, for the past one month or so, I've been having an issue where my engine shuts off at low RPMs. If I'm at a stop and I try to start off, the engine shuts off unless I rev it to 5-6K RPM. This didn't happen before. I have always driven by starting off at 3K RPM.

    Also, the engine randomly stalls while coming to a halt at a traffic light or something.

    I've tried tuning the carb and setting it to a richer mixture. It has slightly improved the issue, but not too much.

    Has my carb gotten blocked by the impurities in fuel? What do i do?

    Leave a comment:

  • RohIIT
    replied
    Re: Honda Unicorn

    Originally posted by SatSon View Post
    AFAIK, Unicorn is tall geared compared to Hunk/Xtreme. Remember the 15T sprocket discussions we had in Xtreme thread?
    So I believe it should do more than 50 kmph at 4k in 5th gear.
    I believe unicorn runs 15/42 combination that gives us drive ratio of 2.8
    and xtreme runs 14/43 which translates to 3.07 .
    So yes unicorn's gearing seems to be in taller side , but as one more member said his bike does same speeds in 5th gear 4k rpm.

    So either my clutch is gone or compression is getting lower.

    Leave a comment:

Previous 1 15 20 21 22 23 24 25 26 27 28 29 30 34 template Next
Working...
X
© xBhp.com 2026. All rights reserved.
Designed by xBhp