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Offline gregjet

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Re: 16,000m Service time
« Reply #20 on: November 21, 2018, 10:48:14 AM »
Can't remember what they were but they were VERY standard bearings front and back. Swedish ( skf) or Japanese made bearings are the go. NSK or NTN etc. for example. Just check they are ACTUALLY made in Japan not hived off to China or Korea ( or worse Thailand or India). Having said that the Chinese make spectacularly good bearings, BUT you need to know which ones are, and I don't. Including hybrid ceramics.
Swingarm bearings prob worth a look as well, They are needles on one side so could use a regrease if OK. The other side is a PAIR of back to back common bearings, but you will prob have to buy ones with seals and remove the resultant inners. Not strictly necessary but topping them up with quality moly or aluminium grease will extend their life and keep them smooth.

Offline SnowOwl

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Re: 16,000m Service time
« Reply #21 on: November 21, 2018, 01:36:17 PM »
All Balls Racing is a reputable supplier of quality bearing and seal kits.

https://www.allballsracing.com/
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Offline gregjet

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Re: 16,000m Service time
« Reply #22 on: November 21, 2018, 08:12:38 PM »
Lots of reports of poor results for All Balls seals and bearings over the last couple of yeasr. They mainly source Chinese Cheap apparently.

Offline SnowOwl

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Re: 16,000m Service time
« Reply #23 on: November 21, 2018, 11:32:41 PM »
Thanks for the update on All Balls Racing.  It's been awhile since I bought from them.  I guess things have changed.
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Online ThirtyOne

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Re: 16,000m Service time
« Reply #24 on: November 22, 2018, 01:45:55 AM »
*Originally Posted by gregjet [+]
Lots of reports of poor results for All Balls seals and bearings over the last couple of yeasr. They mainly source Chinese Cheap apparently.

Definitely good to know. I was also under the impression at All Balls was one of the best place to get bearings.

Offline gregjet

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Re: 16,000m Service time
« Reply #25 on: November 22, 2018, 03:00:19 AM »
They do supply full reseal and bearing kits . Good if you have to get a bike up to standard to sell. But reports I have been seeing have problems with seal life and bearing quality. They need to re -source for quality, not cheapness, to re-attain their once well deserved reputation.

Offline Aggie95

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Re: 16,000m Service time
« Reply #26 on: February 09, 2019, 11:53:43 PM »
*Originally Posted by EscCtrl [+]
My valves started going tight by 7500 miles. By 9000 miles, I couldn't get to 70mph.

EscCtrl,
It sounds like you are quite an experienced MC mechanic?  I am a semi-retired engineer, but I also was a mechanic for 25 years before I went back to school and got a degree. 
I am curious about your statement cited above.  In all my mechanic experience (very little on MC's), I have never known a valve train to wear "tighter", always looser.  Looser is noisy and prevents the engine from breathing well (poor performance, but seldom serious damage), but too tight holds valves open and results in burnt valves and/or seats.  Is this the nature of this valve train, or have I misinterpreted your post?

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Offline EscCtrl

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Re: 16,000m Service time
« Reply #27 on: February 10, 2019, 04:27:32 PM »
*Originally Posted by Aggie95 [+]
EscCtrl,
It sounds like you are quite an experienced MC mechanic?  I am a semi-retired engineer, but I also was a mechanic for 25 years before I went back to school and got a degree. 
I am curious about your statement cited above.  In all my mechanic experience (very little on MC's), I have never known a valve train to wear "tighter", always looser.  Looser is noisy and prevents the engine from breathing well (poor performance, but seldom serious damage), but too tight holds valves open and results in burnt valves and/or seats.  Is this the nature of this valve train, or have I misinterpreted your post?

With moto engines, the exhaust valves tend to run tight over time. I've found this to be the case on all motorcycles I have owned over 30 years. The intakes, once seated, usually do not require adjustment very often. The heat and beat cycles from the opening and closing of the valves cause the valves and seats to recede into the head. I don't know if that is due to the head being aluminum or what the deal is. I'm sure the exhaust valves running hot helps speed the process. I have run into burnt valves on other motorcycles due to the exhaust valves being too tight and ran that way for too long. I've even seen valve heads broken off the stems. That equaled to a blown engine of course.

Most of the parts in the valve train are hardened and rarely show any significant wear. Because of the high RPM nature of moto engines, the valve springs are really stiff and have a lot of closing pressure to prevent valve float and maintain the seal. Some motorcycle engines do not have valve seats and instead, have the valve seat cut directly into the head. I'm sure this contributes to the receding valve problem. I'm not sure if the CB-X has this or not. I haven't been that far inside the engine yet. I could look in my service manual but it's not with me. Very few motorcycle engines have hydraulic tappets or lifters. The ones that I know of that do have them are the Honda V fours. Those engines are really smooth and deliver the power in a nice curve that would get me into lots of trouble.

I've found that auto engine valve trains to wear and the hardened valve seats to hold their position which leads to sloppy tolerances over time unless the lifters are hydraulic, which most vehicles have had since the '60s. I did have a solid lift cam in an AMC 304 that I built to a 307 that was in my '74 Jeep CJ-5. It required frequent valve adjustments, usually lose.

I was an ASE auto tech from '93 to '00. I started Suspension Techniques in '93 while in high school and later sold out in '95. I started working on motos when I was a boy. My father passed when I was young and I had no one around to help me keep them running. I dabbled in motos until my early 30's when I started doing some moto work for friends. That's mostly what I do now. Other than that, I hold a certificate in industrial mechanics and of all things a cert in bicycle mechanics.
« Last Edit: February 10, 2019, 04:31:10 PM by EscCtrl »
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Offline Superplasma

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Re: 16,000m Service time
« Reply #28 on: February 10, 2019, 04:40:15 PM »
*Originally Posted by EscCtrl [+]
With moto engines, the exhaust valves tend to run tight over time. I've found this to be the case on all motorcycles I have owned over 30 years. The intakes, once seated, usually do not require adjustment very often. The heat and beat cycles from the opening and closing of the valves cause the valves and seats to recede into the head. I don't know if that is due to the head being aluminum or what the deal is. I'm sure the exhaust valves running hot helps speed the process. I have run into burnt valves on other motorcycles due to the exhaust valves being too tight and ran that way for too long. I've even seen valve heads broken off the stems. That equaled to a blown engine of course.

Most of the parts in the valve train are hardened and rarely show any significant wear. Because of the high RPM nature of moto engines, the valve springs are really stiff and have a lot of closing pressure to prevent valve float and maintain the seal. Some motorcycle engines do not have valve seats and instead, have the valve seat cut directly into the head. I'm sure this contributes to the receding valve problem. I'm not sure if the CB-X has this or not. I haven't been that far inside the engine yet. I could look in my service manual but it's not with me. Very few motorcycle engines have hydraulic tappets or lifters. The ones that I know of that do have them are the Honda V fours. Those engines are really smooth and deliver the power in a nice curve that would get me into lots of trouble.

I've found that auto engine valve trains to wear and the hardened valve seats to hold their position which leads to sloppy tolerances over time unless the lifters are hydraulic, which most vehicles have had since the '60s. I did have a solid lift cam in an AMC 304 that I built to a 307 that was in my '74 Jeep CJ-5. It required frequent valve adjustments, usually lose.

I was an ASE auto tech from '93 to '00. I started Suspension Techniques in '93 while in high school and later sold out in '95. I started working on motos when I was a boy. My father passed when I was young and I had no one around to help me keep them running. I dabbled in motos until my early 30's when I started doing some moto work for friends. That's mostly what I do now. Other than that, I hold a certificate in industrial mechanics and of all things a cert in bicycle mechanics.


Top post,10/10,I have all ways found valves go tight after time.

Superplasma.

Offline EscCtrl

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Re: 16,000m Service time
« Reply #29 on: February 10, 2019, 04:49:17 PM »
*Originally Posted by Superplasma [+]

Top post,10/10,I have all ways found valves go tight after time.

Superplasma.

 :062:  :821:
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I rescue neglected and battered motorcycles.

 


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