Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: adespin on August 21, 2018, 05:14:32 PM
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I've no doubt that this has been asked many times before, so i apologize in advance for asking. My 71 K1 750 has a horrible ride on the front end, the forks follow every large or small undulations in the road, only hitting a pothole do i get any fork action.
When moving the forks up and down on standstill they seem to work fine, it's putting me off going out for a ride. :'( :'(
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Check fork oil
You may have to much or to thick.try altering tyre pressure up or down a few Psi
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As John says, tyre pressure and also the type / make of tyre can make a huge difference. Also consider overhauling the forks if the basics don't make it any better. Maybe too little or too much oil, or knackered oil.
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Maybe its just a case of getting used to it... these old bikes have big heavy wheels and slighty cruder suspension than the modern stuff.... mine is also a little less smooth over rough surfaces than my more modern stuff but the forks have been stripped, serviced and have the correct amount of fresh oil and they work fine when being compressed... so I think it may be just something to get on with.
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Make sure no one has put washers/spacers on top of the springs ;)
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Make sure no one has put washers/spacers on top of the springs ;)
Trigger what would be the reason for adding spacers on top of the springs ?
The previous owner supposedly gave the bike a full service including new fork seals and oil before selling it to me, so i will try changing the oil to 5w.
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Make sure no one has put washers/spacers on top of the springs ;)
Trigger what would be the reason for adding spacers on top of the springs ?
The previous owner supposedly gave the bike a full service including new fork seals and oil before selling it to me, so i will try changing the oil to 5w.
try ATF oil
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Is that what you use John ?
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Is that what you use John ?
It's what Honda recommend!
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Is that what you use John ?
my car is an auto,so I use some of that ,Dextron II ,get it from amotor factorer ,lot cheaper than garages .
https://www.eurocarparts.com/ecp/c/Toyota_Corolla_1.3_1998/p/car-accessories/engine-oils-and-car-fluids/car-tranmission-oils/automatic-transmission-fluids/?522776082&0&cc5_869
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Adding spacers to teh top of the forks is an old-school way of stiffening up the springs. You are basically preloading the spring. It has a side effect of reducing the travel leading to some interesting effects under load and bottoming out if you hit a bump on the brakes.
The bodgers way could involve stacks of 2p coins.....which gave you a regular size and was...well...cheaper than buying big washers! I found that one first when I unscrewed a top cap and got a surprise shower of small change.
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Adding spacers to teh top of the forks is an old-school way of stiffening up the springs. You are basically preloading the spring. It has a side effect of reducing the travel leading to some interesting effects under load and bottoming out if you hit a bump on the brakes.
The bodgers way could involve stacks of 2p coins.....which gave you a regular size and was...well...cheaper than buying big washers! I found that one first when I unscrewed a top cap and got a surprise shower of small change.
The mind boggles :o
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A frequently done misconception.
All adding spacers does is limit the amount of travel in a spring. It doesn't stiffen springs at all. The spring rate is the spring rate no matter how many spacers are put in.
Do not confuse a springs, spring rate with a springs, load/design rate.
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I think what was really going on was taking up the slack on worn out springs that had a permanent set. Put the springs under load and the bike would sit higher and appear stiffer.
Then you go for a ride and convince
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Are your wheels correctly trued and balanced ?. My front wheel was not fully trued, it had a flat spot , I have improved it but it needs another go, as does the rear wheel. Making a slight improvement on the front made a slight diffence to the bounce I was experiencing although I still need to properly true them both. I have also picked up some 5w oil which I will add to improve the damping. Like you it puts me off riding the Honda a little, but with some patience I suspect it will get sorted.
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Are your wheels correctly trued and balanced ?. My front wheel was not fully trued, it had a flat spot , I have improved it but it needs another go, as does the rear wheel. Making a slight improvement on the front made a slight diffence to the bounce I was experiencing although I still need to properly true them both. I have also picked up some 5w oil which I will add to improve the damping. Like you it puts me off riding the Honda a little, but with some patience I suspect it will get sorted.
That's something i'll have to check.
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By way of an update, I have just added a 5w oil to my forks and the bounce has in fact reduced quite considerably.
I'm not saying I have in fact cured it yet as I would like a second opinion on the 're Truing ' of the wheels by someone.
Another issue I guess mentioned by a previous party was that we should not I guess expect too much from these bikes, they are heavy, old tech and should not be compared to a modern machine. I find I am doing this constantly with the ride and the engine noises and quite frankly it drives you a little mad.
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I managed a decent 40mile run today by way of a test after changing the oil to 5w. Has definatly made an improvement to the extent I have to forgive the 'performance of the front suspension ' by virtue of its design and age. Very pleased with the improvement. I guess it depends also on the weight of the rider and the style of riding ?. Being only circa 11.5 stone the 5 w seems to work for me.
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Have the same issue with my CB750K7...
Not sure for values of your weight you provided (stone - is that kind of slang, equal to feet of what? Sorry that I don't understand...)
My weight is 80kg (naked :D)
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By way of an update, I have just added a 5w oil to my forks and the bounce has in fact reduced quite considerably.
I'm not saying I have in fact cured it yet as I would like a second opinion on the 're Truing ' of the wheels by someone.
Another issue I guess mentioned by a previous party was that we should not I guess expect too much from these bikes, they are heavy, old tech and should not be compared to a modern machine. I find I am doing this constantly with the ride and the engine noises and quite frankly it drives you a little mad.
You want to try going for a ride on something old then. ;)
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I'm about 9.5 stone and 17 hands and use 10w oil ;)
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Have the same issue with my CB750K7...
Not sure for values of your weight you provided (stone - is that kind of slang, equal to feet of what? Sorry that I don't understand...)
My weight is 80kg (naked :D)
Where are you located Erny ? not in the UK i would guess. 1Kg = 2.2lbs(pounds), 14lbs = 1stone, (old british weight measurement). Personally i can't get to grips with a persons weight in kg, too long in the tooth :'( 80kg means nothing to me, i have to convert it to stones to know if you are a lightweight or a fat b*stard like me (16stone)
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5ft tall x 80kg = fat bastard . 6ft tall x 80kg = bastard. 6ft 6 inches x 80kg = skinny bastard. I hope this helps a little. ;D
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Eloquently put in plain english ;D
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Have the same issue with my CB750K7...
Not sure for values of your weight you provided (stone - is that kind of slang, equal to feet of what? Sorry that I don't understand...)
My weight is 80kg (naked :D)
Where are you located Erny ? not in the UK i would guess. 1Kg = 2.2lbs(pounds), 14lbs = 1stone, (old british weight measurement). Personally i can't get to grips with a persons weight in kg, too long in the tooth :'( 80kg means nothing to me, i have to convert it to stones to know if you are a lightweight or a fat b*stard like me (16stone)
I live in Slovakia, we use metric system only. I knew about pounds, pint, gallon, ounce, inch, foot, yard, mile.. But never heard about stone. For me stone = rock
But now I learned something new - thanks for that!
Looking at wiki right now (https://uploads.tapatalk-cdn.com/20180905/c31c54292ad671b0690ae88c4dfbac83.jpg)
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And there was me thinking the SK was a stockport postcode !
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Have the same issue with my CB750K7...
Not sure for values of your weight you provided (stone - is that kind of slang, equal to feet of what? Sorry that I don't understand...)
My weight is 80kg (naked :D)
Where are you located Erny ? not in the UK i would guess. 1Kg = 2.2lbs(pounds), 14lbs = 1stone, (old british weight measurement). Personally i can't get to grips with a persons weight in kg, too long in the tooth :'( 80kg means nothing to me, i have to convert it to stones to know if you are a lightweight or a fat b*stard like me (16stone)
I live in Slovakia, we use metric system only. I knew about pounds, pint, gallon, ounce, inch, foot, yard, mile.. But never heard about stone. For me stone = rock
But now I learned something new - thanks for that!
Looking at wiki right now (https://uploads.tapatalk-cdn.com/20180905/c31c54292ad671b0690ae88c4dfbac83.jpg)
Just to add to the fun do not forget. The US gallon is used in the United States and is equal to exactly 231 cubic inches or 3.785411784 litres The Imperial gallon or UK gallon is used in the United Kingdom and is equal to approximately 277.42 cubic inches. Its exact value is defined as 4.54609 litres One imperial gallon is approximately 1.2 US gallons.
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Wau again something new until now for me gallon was just gallon, did not know there 2 gallons existing
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The US gallon is actualy more logical as they say 16 ounces to a pound so 16 fluid ounces to a pint whereas UK say 20 fluid ounces to a pint but still 8 pints to a gallon so bigger gallons.
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Oh dont get me started on different variations.. I sell pumps (irrigation pumps...big ones) and the mixture of standards I get as enquiries... a bore will give X Gallons per hour while they want X litres per day at X feet of head and they have X metres of pipework... Problem is most Cocky's (Farmers here in Aus) are older guys and still live in the pre-metric age.. or they mix and match.
I must admit though.. I cant visualise 173cm but I can 5Ft 8in... but then I can also visualise 85 or 90kg but have no idea what that would be in stone.. so I guess I am just as bad.. :)
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84kg is 13stone 5lbs cos thats what i am now after the stent and 4 months of eating cardboard
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Oh dont get me started on different variations.. I sell pumps (irrigation pumps...big ones) and the mixture of standards I get as enquiries... a bore will give X Gallons per hour while they want X litres per day at X feet of head and they have X metres of pipework... Problem is most Cocky's (Farmers here in Aus) are older guys and still live in the pre-metric age.. or they mix and match.
I must admit though.. I cant visualise 173cm but I can 5Ft 8in... but then I can also visualise 85 or 90kg but have no idea what that would be in stone.. so I guess I am just as bad.. :)
The reason you can't visualise stones is because you live DOWN UNDER, you have to be standing the right way up then it's simple ; ::)
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I dont think that is it.. might just be I am getting old :)