Announcement

**Aryan** · 09-11-2010, 12:08 AM

Query Approved.

**pavanchirmade** · 09-11-2010, 01:37 AM

Rebore it to next size is the good option here considering the shoe string nature of the budget. But reboring to higher CC makes more sense.

**samarth14feb** · 09-11-2010, 11:56 AM

Originally posted by jugnu_sidhu View Post

my 2006 unicorn (bought it used) has run 50,000 kms (actually its 60 less as i type now) and it has begun to drink and smoke lately, got it's head fixed today for a bent valve but things are not better. My mech has told me to get a new barrel and he's not keen on getting a rebore. so i have below listed options

1. get a new barrel with a piston
2. get it bored to next size
3. get a bigger rebore to higher cc
4. other options....

and also air screw is stuck need to get a new one how much would it would cost

O.T- all the things have to be done under shoe string budget

Dude for just 50k i don think u need a rebore(unless u used ur bike without proper engine maintenance) so i would suggest u to have multiple options. *Firstly i strongly guess ur piston rings are worn out. just get it checked if there is any gap in the rings.
*if prob is not with the rings make sure valve are properly lapped
*Finally if both rings and valves are perfect then i suggest u to either rebore to next size(budget work)(if u haven touched engine it should be rebored to .25 i think u can use USHA pistons readily available for 0.25 size, dont go for SAM-) dont think of higher cc reboring as most of the time they are not worth it with very slight increase in performance.
*if U dont want to rebore it then best option is replace with stock borekit. please dont try to fix bigger bore kits cos metal compositions of diff manufacturers(companies and bikes) will b diff resulting in different expansion and contraction of the metal and resultant will be leakages, compression leakages and low performance.

Good Luck

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Unicorn at 50,000 kms

Unicorn at 50,000 kms

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