Topic: Engine knocks occasionally before failing to start.

[juntjoo]

It happens usually when there isn't enough juice to make a quick easy start. It doesn't persist in the moment it's happening though. I'll just wait til I got enough juice then start it as usual  just wondering what this is about and if it's anything to worry about.

[bryanj]

When you say juice do you mean gas or electric?

[juntjoo]

When you say juice do you mean gas or electric?

Electric. I'm often having to charge my battery

[bryanj]

Then it could be the starter clutch hammering back, too much of that will damage the rollers pins and springs and can even loosen the holding screws.

EDIT and why are you having to charge your battery?

[caluser2000]

How old is the battery?

[juntjoo]

How old is the battery?

Less than a year. It's my second Walmart battery. I'm beginning to suspect all my electrical woes might just be due to this. I'll find out next time I get a battery. May be soon.

[evinrude7]

I recall you mentioning this issue before with regard to charging. Did you ever test the battery at various revs up to 4000 rpm and record the voltage readings?

Sent from my moto g(7) using Tapatalk

[juntjoo]

I recall you mentioning this issue before with regard to charging. Did you ever test the battery at various revs up to 4000 rpm and record the voltage readings?

Sent from my moto g(7) using Tapatalk

Yeah when fully charged it will go up to 14 volts. It always settles down at 12.8-7 even after charging up to 13.5ish volts though not sure if that's normal. Seems to lose a point one volt every few hours. Not sure if that's a "parasitic drain" or not but I still have diagnostics to do. 8 did do a test for that a bit back and I didn't find anything but I may not have done it right

[evinrude7]

I recall you mentioning this issue before with regard to charging. Did you ever test the battery at various revs up to 4000 rpm and record the voltage readings?

Sent from my moto g(7) using Tapatalk

Yeah when fully charged it will go up to 14 volts.

So you are saying 14 volts when the motor is turning 4000 rpm?  Should it not be 14.5 volts at that engine speed? Or is the 650 different than the 750?

Sent from my moto g(7) using Tapatalk

[juntjoo]

I recall you mentioning this issue before with regard to charging. Did you ever test the battery at various revs up to 4000 rpm and record the voltage readings?

Sent from my moto g(7) using Tapatalk

Yeah when fully charged it will go up to 14 volts.

So you are saying 14 volts when the motor is turning 4000 rpm?  Should it not be 14.5 volts at that engine speed? Or is the 650 different than the 750?

Sent from my moto g(7) using Tapatalk

It works in that as the rpms increase so do the volts but not enough. That's what I've observed. Works but not enough. I'm going by my voltmeter accessory but I've tested direct to battery with stand alone meter and I recall not being totally satisfied by the results.

[juntjoo]

Then it could be the starter clutch hammering back, too much of that will damage the rollers pins and springs and can even loosen the holding screws.

EDIT and why are you having to charge your battery?

Would this be from starting without enough battery power? Sounds like it as I think that's usually when it happens. It's not often but often enough to make the thread

[caluser2000]

Then it could be the starter clutch hammering back, too much of that will damage the rollers pins and springs and can even loosen the holding screws.

EDIT and why are you having to charge your battery?

Would this be from starting without enough battery power? Sounds like it as I think that's usually when it happens. It's not often but often enough to make the thread

Yes.

Us 50/550 just use the kick start when this happens, )

Do you do a lot of around town? The charging system on the 650 wasn't really much better, They change the permanent magnet\ altgernator with one that needs carbon brushes.and of course solid state reg/rct unit. I had a CB650 Custom and my brother a CB650Z Euro style one.

A battery tender might be the way to go if you are doing regular short trips with the headlight on.

[juntjoo]

Then it could be the starter clutch hammering back, too much of that will damage the rollers pins and springs and can even loosen the holding screws.

EDIT and why are you having to charge your battery?

Would this be from starting without enough battery power? Sounds like it as I think that's usually when it happens. It's not often but often enough to make the thread

Yes.

Us 50/550 just use the kick start when this happens, )

Do you do a lot of around town? The charging system on the 650 wasn't really much better, They change the permanent magnet\ altgernator with one that needs carbon brushes.and of course solid state reg/rct unit. I had a CB650 Custom and my brother a CB650Z Euro style one.

A battery tender might be the way to go if you are doing regular short trips with the headlight on.

I wonder what the DIY upgrade is on my bike. I have a light switch I put in I can turn off whenever

[caluser2000]

Then it could be the starter clutch hammering back, too much of that will damage the rollers pins and springs and can even loosen the holding screws.

EDIT and why are you having to charge your battery?

Would this be from starting without enough battery power? Sounds like it as I think that's usually when it happens. It's not often but often enough to make the thread

Yes.

Us 50/550 just use the kick start when this happens, )

Do you do a lot of around town? The charging system on the 650 wasn't really much better, They change the permanent magnet\ altgernator with one that needs carbon brushes.and of course solid state reg/rct unit. I had a CB650 Custom and my brother a CB650Z Euro style one.

A battery tender might be the way to go if you are doing regular short trips with the headlight on.

I wonder what the DIY upgrade is on my bike. I have a light switch I put in I can turn off whenever

That was standard in a lot of market. Both mine and my little bros had headlight on/off switches.

Back then here in NZ the compulsory headlight on policy had not been put in to place. I don't legibly have to have my headlight on while riding because of its age. I choose to though. I'd rather make it easy as possible for other road users to see me.

The three LED driving light unit is brilliant. And I mean that literally. A lot of other road users will pull to the left when they spot me in their rear view mirror making passing a breeze. I always wave to acknowledge their kind actions and get a smile or wave back. It is the right thing to do I feel:)

[juntjoo]

Then it could be the starter clutch hammering back, too much of that will damage the rollers pins and springs and can even loosen the holding screws.

EDIT and why are you having to charge your battery?

Would this be from starting without enough battery power? Sounds like it as I think that's usually when it happens. It's not often but often enough to make the thread

Yes.

Us 50/550 just use the kick start when this happens, )

Do you do a lot of around town? The charging system on the 650 wasn't really much better, They change the permanent magnet\ altgernator with one that needs carbon brushes.and of course solid state reg/rct unit. I had a CB650 Custom and my brother a CB650Z Euro style one.

A battery tender might be the way to go if you are doing regular short trips with the headlight on.

I wonder what the DIY upgrade is on my bike. I have a light switch I put in I can turn off whenever

That was standard in a lot of market. Both mine and my little bros had headlight on/off switches.

Back then here in NZ the compulsory headlight on policy had not been put in to place. I don't legibly have to have my headlight on while riding because of its age. I choose to though. I'd rather make it easy as possible for other road users to see me.

The three LED driving light unit is brilliant. And I mean that literally. A lot of other road users will pull to the left when they spot me in their rear view mirror making passing a breeze. I always wave to acknowledge their kind actions and get a smile or wave back. It is the right thing to do I feel:)

I think I once looked for those but didn't find one or maybe it was too expensive. Link me the cheapest one you know of would ya?

[caluser2000]

I believe in folks finding their own stuff. Mine is Whites branded. Cost me nz$25 and I bought it at the local Honda shop.So it didn't cost much at all for the job it does.

I left the two leads to the LED unit long enough to sit the bikini fairing on the front mud guard resting against the fork tube rubbers. So no need to disconnect it from inside the headlight shell if I wanted to work around the switch/instrument area of the bike. 

[juntjoo]

I believe in folks finding their own stuff. Mine is Whites branded. Cost me nz$25 and I bought it at the local Honda shop.So it didn't cost much at all for the job it does.

I left the two leads to the LED unit long enough to sit the bikini fairing on the front mud guard resting against the fork tube rubbers. So no need to disconnect it from inside the headlight shell if I wanted to work around the switch/instrument area of the bike.

Oh I was thinking you were talking about the headlight

[caluser2000]

I believe in folks finding their own stuff. Mine is Whites branded. Cost me nz$25 and I bought it at the local Honda shop.So it didn't cost much at all for the job it does.

I left the two leads to the LED unit long enough to sit the bikini fairing on the front mud guard resting against the fork tube rubbers. So no need to disconnect it from inside the headlight shell if I wanted to work around the switch/instrument area of the bike.

Oh I was thinking you were talking about the headlight

Just change the H4 bulb of a LED one. Around $10us on Amazon. I had two sent to me for nz$40 to my door in less than a week 4 months ago.

[juntjoo]

I believe in folks finding their own stuff. Mine is Whites branded. Cost me nz$25 and I bought it at the local Honda shop.So it didn't cost much at all for the job it does.

I left the two leads to the LED unit long enough to sit the bikini fairing on the front mud guard resting against the fork tube rubbers. So no need to disconnect it from inside the headlight shell if I wanted to work around the switch/instrument area of the bike.

Oh I was thinking you were talking about the headlight

Just change the H4 bulb of a LED one. Around $10us on Amazon. I had two sent to me for nz$40 to my door in less than a week 4 months ago.

sweet. Thanks!

[caluser2000]

I believe in folks finding their own stuff. Mine is Whites branded. Cost me nz$25 and I bought it at the local Honda shop.So it didn't cost much at all for the job it does.

I left the two leads to the LED unit long enough to sit the bikini fairing on the front mud guard resting against the fork tube rubbers. So no need to disconnect it from inside the headlight shell if I wanted to work around the switch/instrument area of the bike.

Oh I was thinking you were talking about the headlight

Just change the H4 bulb of a LED one. Around $10us on Amazon. I had two sent to me for nz$40 to my door in less than a week 4 months ago.

sweet. Thanks!

You are quite welcome.

Sometimes we can over think things. You know, like motorcycle tire pressures

[scunny]

"Do you do a lot of around town? The charging system on the 650 wasn't really much better, They change the permanent magnet\ altgernator with one that needs carbon brushes.and of course solid state reg/rct unit. I had a CB650 Custom and my brother a CB650Z Euro style one."
I will have to disagree with that. My 650Z starts charging just above idle,(with headlight off) I was worried about the 650's rumoured charging woes, so installed a voltmeter from a CB900, but I can see if you just putt about with the headlight on, it could be an issue. Keep the engine in it's sweet spot and no problem.

[caluser2000]

You missed out "the lot of riding around with headlight always on" bit.

DOHC900/750s along with SOHC 650s batteries do not last long with a lot of around town headlights always on riding from my own experience riding them. Those that didn't have headlight on/off install switches to turn the headlight off like I have with my current  1998 XF650.

[scunny]

Yeah, I mentioned the headlight off. I will have to do a test ride this weekend and take notice of the voltage readings as I go. Probably have to verify the voltmeter with my my other testers as well.

[caluser2000]

Yeah, I mentioned the headlight off. I will have to do a test ride this weekend and take notice of the voltage readings as I go. Probably have to verify the voltmeter with my my other testers as well.

Do it for a month\. or more without recharging the battery and see what happens.

Cutting out a portion of a quote to try an push your point of veiw is not cool or being honest btw.

[dave500]

dont be scared to ride around town in a lower gear to keep rpm high,dont lug these bikes at less than 2500 and try to keep the revs low,they shine at higher rpm and will be ready to gun it away from trouble if need be,they cruise at 4000,theyll sit at 5000/6000 all day even more,its the way they are.