'94 zx900 i just recently bought this bike. it didnt run when i bought it an ive givin it some TLC an now she runs ok. ive got two big concerns. first, seems like a rattle noise coming from under the tank, im thinking its the cam chain tensioner. second, when i take off out of 1st, engine seems to bog way down an rattles loud like im not giving it enough gas. please help...

 

Tune it. Congrats on the new ride and welcome to KF

 

Welcome to KF!
Have you cleaned the carbs yet? usually the first task on a new bike. Let us know how it goes.

 

yes, carbs an new plugs was the first things i did. the take off issue reminds me of an old beat up diesel truck taking off. it only does it from a complete stop, not if im rollin a little bit.

 

Free; great ride you have there!!! I have a '95. As much as they weigh, some times I think they REALLY ARE a diesel truck......!
I would guess you probably need a valve adjustment, and to check the cam chain tensioner (like you mentioned.) Make sure you're using fresh gas, and clean the grunge outta the jets if it's been sitting very long; like Prom said^.
Welcome to the forums. Gear up; stay safe.

 

Could just be how the bike rides, my bike doesnt move well at all until it comes off idle, I get a big jump at 2500 if I'm not going for a quick launch.

 

what exactly would happen if the cam chain tensioner wasnt working right? how about if the valves needed adjusted, how would it run?

 

I'm gonna get punched in the face for this....

If the cam chain tensioner isn't working properly then the cam chain will not have the proper tension.

Sorry bro. The tensioner keeps pressure against the chain and keeps it from coming loose. If it doesnt work properly the chain will become loose and will flop around inside the case. This causes the rattling sound and 90% of the time it is harmless. However if the chain gets loose enough it can hit the sides of the case causing minor damage, or jump teeth causing the bike to run like monkey poo and possibly causing serious damage to the valves and pistons, or in extreme cases the chain could break causing extensive damage to the case, bent valves, damaged pistons, and possible damage to the head and cams.

People have run for years with the "Kawi Rattle" with no adverse effects, and yes it is a common problem, but it can be fixed with a little time and a little beer. Keep us posted.

 

wow, if the cam chain gets that loose prom, that is an issue for sure. But yes, the CCT is not the greatest and a loose (not proms loose) chain can and will affect starting issues. A bog at 2500rpm? I still think tune that gal. Check valves, readjust the CCT at the same time. (just that you have a good baseline to work from and will not have to touch it again for a long time) But in the end you may likely find that the carbs are just not cleaned and adjusted.

 

If your cam chain isnt hitting the crank case your an underachiever, drag.