Knowledgeables please help with your inputs..

[RexMan]

Thanks for all the help guys...really appreciate all your inputs...

 

It seems I have lots to do to the bike then...sigh...

 

When I collect the bike from the shop, I saw they did a service...spark plug change, engine oil 3 bottles...can't remember what oil they use...

 

The dropping of gears is not due to engine braking I think...cos i off throttle, clutch in all the way and tap tap tap down...on the top gears is not so jerky but lower gears, my pillion gf confirm hit her helmet against mine...not her fault thou, I feel the jerking is quite bad...I used to ride XR4...doesn't give me such gear problems...

 

Was wondering to change the air filter to KNN and do a carb service with tuning....any good place in the east side to recommend? A friendly mech who could address the other problems I'm facing would be a bonus...

 

I'm also thinking of JB for this kinda more expensive jobs...any place you guys know of?

[Ah Pek]

Power la ah pek :thumb:

ur explanation boost my morale up man, think really gotta do it liao sure burn pocket.

 

really got tt 'thruking' sound or feeling, like a drum is beating tt type. Actually wat is tt? will it affect e piston? Dun mind explaining, think i must salute u or kopi next time.

 

Really got 'thruking' sound like a drum is beating..aiyoh!..quite certain a sympton of extreme backlash of the cam chain. Looks like the cam chain tensioner is not working. Usually cam chain is very tough..err..get the mech to check see chaining the chain tensioner will help *that big tapered cyclinder thing sticking out behind the lower engine block infront between the two middle carbs). It does not require ebgine block operation. Get that change first and see how. The tensioner is to suppress the 'slippers" that gudie the cam chain from extreme "back whipping" or backlash mostly called.

[Ah Pek]

cos i off throttle, clutch in all the way and tap tap tap down...on the top gears is not so jerky but lower gears, my pillion gf confirm hit her helmet against mine...

 

My guess is clutch problem...from housing to plates...try getting oyur "biting point" correct first. One such similar incident was corrected when we found that the clutch cable was frayed. You may want to check the cable.

[JbAtRaCeR]

Really got 'thruking' sound like a drum is beating..aiyoh!..quite certain a sympton of extreme backlash of the cam chain. Looks like the cam chain tensioner is not working. Usually cam chain is very tough..err..get the mech to check see chaining the chain tensioner will help *that big tapered cyclinder thing sticking out behind the lower engine block infront between the two middle carbs). It does not require ebgine block operation. Get that change first and see how. The tensioner is to suppress the 'slippers" that gudie the cam chain from extreme "back whipping" or backlash mostly called.

 

 

Bro,need your advice is the honda cam chain tensior adjustable?..Most of my friends and my lecturer told me that its auto adjust by using the eo pressure but i got this CB400 manual (in russian language),it shows that the CCT is adjstable. What i see is they remove the 8mm bolt and adjust from there.

[Ah Pek]

Bro,need your advice is the honda cam chain tensior adjustable?..Most of my friends and my lecturer told me that its auto adjust by using the eo pressure but i got this CB400 manual (in russian language),it shows that the CCT is adjstable. What i see is they remove the 8mm bolt and adjust from there.

 

About auto adjust by eo pressure..never heard of but may be for car, definitely not S4 or nikes I know. The tensioner is spring tensionised to push the chain slippers and would eventually slack out in use. There is a round cover on the right side of the gear box housing and there is a allen key type bolt..that may have to come off to access the timing fly wheel or something like that to turn the movement for the crankshaft while adjusting (setting) the tensioner. The ideal is to set to the move the cam chain while the tensioner set nut is loosen and the tension spring pushes to tighten before the bolt locks it again. But once the cam chain slippers guide is worn out or tinn out or broken, it has to be replace..then that's different. The 8mm bolt actually is a 'release' nut to actuate release for the spring to push fore. Just a guess but this is how we DIY in the past on a CX500 Honda.

[newcomer]

better get that timing chain checked bro. if it breaks u can say bye bye to ur valves and pistons...

anyways for mechs in jb that do big bikes i know of, got two in tun aminah. or you can always go the bikers' favourite spot, ah gua street...

[longjump]

Really got 'thruking' sound like a drum is beating..aiyoh!..quite certain a sympton of extreme backlash of the cam chain. Looks like the cam chain tensioner is not working. Usually cam chain is very tough..err..get the mech to check see chaining the chain tensioner will help *that big tapered cyclinder thing sticking out behind the lower engine block infront between the two middle carbs). It does not require ebgine block operation. Get that change first and see how. The tensioner is to suppress the 'slippers" that gudie the cam chain from extreme "back whipping" or backlash mostly called.

 

 

 

very chim.. but ah pek u gd.... my bike also got tick tick sound but like "bomb" timer like dat... not loud.... after a long ride it usually comes on.... so i dont really bother..... btw any pics to show wat the cam chain tensioner is?

[newcomer]

http://img205.imageshack.us/img205/2520/51387705ng6.jpg

[loyjwe]

after riding for long already after i off the ignition also got tick tick sound. dunno wats tat. anyway i got another question. sorry to hijack this thread. after i on my ignition my pipe like got some very soft burst sound now n then. why huh? any1 can help??

[Ah Pek]

http://img205.imageshack.us/img205/2520/51387705ng6.jpg

 

Thanks Newcomer...not S4 one but good enough to tell

[Ah Pek]

after riding for long already after i off the ignition also got tick tick sound. dunno wats tat.

 

Normal in new bikes and some not so old or new and sudden temperature changes. The ticking sound is that of hot contracting metal (like heated up bolts and nuts ) cooling off from tight spot at a rappid rate. In short..ok lah.

[Ah Pek]

after i on my ignition my pipe like got some very soft burst sound now n then. why huh? any1 can help??

 

Afraid your question is not clear?...what do you been by "on" ignition?..just turning to "on" or starting the bike as if pressing the start button?

[loyjwe]

opps is start engine. when engine is running, sometimes there will be soft burst sound from the bike. can help?

[Ah Pek]

opps is start engine. when engine is running, sometimes there will be soft burst sound from the bike. can help?

 

Is your exhaust a 3rd party item...that is not stock?

[loyjwe]

mine is stock but dunno tonged anot. coz i saw a screw on the bottom end there. but heard normal endcan also got screw rite? i dunno how to see tong b4 anot. any clue?

[JbAtRaCeR]

About auto adjust by eo pressure..never heard of but may be for car, definitely not S4 or nikes I know. The tensioner is spring tensionised to push the chain slippers and would eventually slack out in use. There is a round cover on the right side of the gear box housing and there is a allen key type bolt..that may have to come off to access the timing fly wheel or something like that to turn the movement for the crankshaft while adjusting (setting) the tensioner. The ideal is to set to the move the cam chain while the tensioner set nut is loosen and the tension spring pushes to tighten before the bolt locks it again. But once the cam chain slippers guide is worn out or tinn out or broken, it has to be replace..then that's different. The 8mm bolt actually is a 'release' nut to actuate release for the spring to push fore. Just a guess but this is how we DIY in the past on a CX500 Honda.

 

Round cover on the right side of the gearbox casing with allen bolt?...Ohh ya the VTEC 1,2 and 3 dont have but the revo have. Mine vtec 3 so need to remove the silver casing(with "honda" word). Btw to adjust the chain cam tensioner,you need to remove the 8mm bolt and slot in an allen key into the 8mm hole rite?..

[Ah Pek]

Round cover on the right side of the gearbox casing with allen bolt?...Ohh ya the VTEC 1,2 and 3 dont have but the revo have. Mine vtec 3 so need to remove the silver casing(with "honda" word). Btw to adjust the chain cam tensioner,you need to remove the 8mm bolt and slot in an allen key into the 8mm hole rite?..

 

Yes..but be very cautious, I believe you have to crank the advance and retard crankshaft fly wheel..something like that..basically to make the cam chain move to its slack and tight position. Experience mech would tab lightly on the start button to move it (don't try this..if the bike start..I dont know what is gonna happened..LOL!) I think non-vtec is a phlips head screw driver but the shaft is thin one to slot in after the size lock bolt is remove.

 

Anyway...this is one hardly area that we hardly need to do at all.

[bryan_LaZY]

http://img205.imageshack.us/img205/2520/51387705ng6.jpg

 

So izzit the 'long long thing' (49118) is the camshaft? izzit tat thing caused the 'truking' sound? not very obvious, but when engine break, sometime can feel e 'drum beat'.... :cry:

 

Think i better dun ride this few days, gg overseas soon, will send for repair once back in sg.... Thanks alot guys, really appreciate ur time n effort to read n answer qns :thumb:

[Ah Pek]

izzit tat thing caused the 'truking' sound? not very obvious

 

No, those are overhead Cam...with reference to your diagram (not S4 one but basically its there)..its the slack and back lashing of item "90527" (cam chain) being excessive or item "12053A" the cam chain tensioner slippers (Solid hard rubble like that much like the one that prevent your chain from hitting your swing arm) either damage or badly worn. normally would tackle the problem with adjusting the tension first..that's item "12048".

[bryan_LaZY]

thanks ah pek

u r a real great help. nw i understand wat u mean and how it operate.

 

So the 'tick tick' sound is caused by e cam chain over e time become 'slacking', nw i know y it 'tick tick'. At first i tot is something loose inside, but dunno wat izzit.

 

Think better go repair, wait 1 damage lead to another damage n become SERIOUS damage....

[newcomer]

if you want to adjust your tensioner u MUST read the service/owner manual first. it's one of the things you wouldn't want to mess up.

 

i have no other idea what's the "truking" sound like but i'm quite certain it's a clutch problem. my scram has the same sound too when engine braking at low speed. well it's an old bike and it's 2stroke, what more can i expect rite?

[Ah Pek]

thanks ah pek

u r a real great help. nw i understand wat u mean and how it operate.

 

So the 'tick tick' sound is caused by e cam chain over e time become 'slacking', nw i know y it 'tick tick'. At first i tot is something loose inside, but dunno wat izzit.

 

Think better go repair, wait 1 damage lead to another damage n become SERIOUS damage....

 

 

LOL!..no lah, you confused already. The sound for trouble cam chain or tensioner is recognised by mild "thruking" (clutch housing problem also) sound and if its continuos "ticking"..its valve clearance problem and component affected can be from "Shim" to "valve spring".

[Ah Pek]

if you want to adjust your tensioner u MUST read the service/owner manual first. it's one of the things you wouldn't want to mess up.

 

i have no other idea what's the "truking" sound like but i'm quite certain it's a clutch problem. my scram has the same sound too when engine braking at low speed. well it's an old bike and it's 2stroke, what more can i expect rite?

 

Yes...clutch housing problem also give out that sound or close to something like that. Any other problems that you can expect are the cruncher roller bearing and the pin beside the usual piston ring set, piston head and cyclinder head decarbonisation.

 

About 2 stroke scramble...there are more sound to listen for...LOL! Anyway, you can't copare a 2 stroke and 4 stroke in many ways. A 2 stroke engine consist of 3 moveable major components..Piston, connecting rod and crankshaft without all the complicated valve mechanics or cam chain.