When to repalce rear shock absorber? are there any critria for the same ? I have Yamaha Crux

Thx in advace.

I have Karizma R which has made 14k kms i recently noticed the white smoke from exhaust and the engine oil level has gone down, i remember i had given my bike to a local mech he did changed the valve clearance later that i observed this what could be issue, and does my bore piston has gone bad ??? or i just need to change the valve settings kindly advice , i if bore poiston kit is replace will that arrest this issue completely ???

I have Karizma R which has made 14k kms i recently noticed the white smoke from exhaust and the engine oil level has gone down, i remember i had given my bike to a local mech he did changed the valve clearance later that i observed this what could be issue, and does my bore piston has gone bad ??? or i just need to change the valve settings kindly advice

for ur points stated above:
1. i hav no wetness on my plug point.

2. no black smoke or white smoke frm my silencer, that means my piston doesnt throw oil an nor i hav excess carbon smoke.

3. i dont use choke for my 1st kick, but after 2 kicks if it feels bike is not starting i try giving choke.

4. color of plug point is black, but not dark black.

5. i use d normal basic fuel, i had tried xtra premium but didnt noticed any difference apart frm little avg, so i never used it again but that was 3 years ago, since last 3 years am using d basic petrol.

6. the AFR is 5.5 rotation in anticlockwise direction frm full lean, i.e it slightly to richer side, for a good pickup.

7. color of spark plug point is black, i dont kno which end u talking, if it bottom end were v put d spark plug wire then it has no color, just d proper silver steel type node as a new plug has.

8. valve clerance i donno, but my mechanic had done some work on valve 2.5 years ago as i was getting some unwanted sound frm d engine. but my valve is original not been changed yet.

9. no never changed air filter, only some times me an my frz ride d bike for almost 0.5 to 1km my removing d air filter. but dats very rare.

10. my kick is not soft its quite hard, so it seems as if d compression is proper in my bike.

11. no modifications have been done so far. only i hav got a new exide battery 2 weeks ago, coz my eralier batteries cell ver gone weak.

12. i dont kno how to check for leaky current, but last sunday i had check whether am getting d proper current in both side wires frm my cdi but touching d wire to d engine cover an try to give a start by kick an self, an d current was same on both d sides.

13. i dont kno wats d slow running circuit in d carburetor.

14. no carks in d intake manifold.

15. an no vaccum leak from inlet manifold.

any now my bike idling is proper, i hav dont nothing changes for it, it just happened after riding d bike for 2-3 days everyday- d probs hav been gone, so my bike doesnt shuts off in idle mode, only probs now is d cold start problem, if i dont use d bike for a day, next day hav to kick it 4-5 times an that too hard kicks.

Above information is half for me.
but any ways.
u can check some of the points.
1. did u find any wetness on plug point?
2. does your bike throw white smoke or black smoke from tail end?
3. do u use choke while first start?
4. what was the color of plug point? Black, brown or bone white?
5. Which fuel u use? ever tried changing the fuel bunk?
6. what is the setting of AFR?
7. what is the color of spark at plug end?
8. When did u last check vlave clearance?
9. Ever changed the air filter?
10. kick is too much soft?
11. Any mods u have done?
12. ever checked plug caps for leaky current?
13. Did u check the slow running circuit in the carburetor?
14. any cracks on intake manifold? (heavy cracks)
15. Is there any vaccum leak from inlet manifold?

Check above points and let me know. Besides where you from?

An my bike lately having starting problems if its not used for a signle day, not sure if the bike wud start in 1st kick on d 3rd day, an i hav serviced my carborator an plugs past sunday but even when d rpm set to 1k the bike shuts off in idle mode by slowly d rpm decreasing. so i thought may b due to my plugs coz they gone old now, i havnt replaced them past 15k km.
do u think changing plugs wud solve d probs ?