Slr 650 clattering noise under load

[Simons...XBR500]

Aye Simon,

Be aware that this change of sprocket size is likely to alter (increase) the number of links in the chain you require. Be careful when purchasing a 'standard' chain for your model of bike, as this may not be long enough to accomodate your increase in size of the gearbox sprocket. If it isn't clear in the parts lists what is being offered and what might be required, enquire before placing your order and if no satisfactory answer is forthcoming, it might be prudent to take your custom elsewhere.

My regards, Bill

hi again bill
I took my front sprocket cover off and the last owner already put a 15t on so wondering about maybe dropping a couple of teeth on the back as it's very revvy even now
Simon

[Simons...XBR500]

I loved mine, no where near as 'revvy' as the F650 but it was the stupidly small tank that drove me mad in the end...

yes I've had a few days and liking it a lot quite pokey as well

[welland99]

Simon,
Wouldn't be a slack drive chain, would it?  Have you checked the chain tension?

it has 20 mm slack !

I don't know the specification for an slr, but it doesn't sound bad.  20mm on an xbr would be fine. 

[timbo]

I wasn't sure if you meant 20mm in addition to the slack which you should have or just a total of 20mm movement. If its the former, then its too slack, if its the latter, then its about right. But as Bill says, check the chain play at different points along the chain, and set at the tightest spot 

[themoudie]

Aye Simon,

Be aware that this change of sprocket size is likely to alter (increase) the number of links in the chain you require. Be careful when purchasing a 'standard' chain for your model of bike, as this may not be long enough to accomodate your increase in size of the gearbox sprocket. If it isn't clear in the parts lists what is being offered and what might be required, enquire before placing your order and if no satisfactory answer is forthcoming, it might be prudent to take your custom elsewhere.

My regards, Bill

hi again bill
I took my front sprocket cover off and the last owner already put a 15t on so wondering about maybe dropping a couple of teeth on the back as it's very revvy even now
Simon

Aye Simon, "Very revvy"!

What is very revvy to you, for a 650cc 4 stroke single, is an inherent design a characteristic of short stroke large bore 4 stroke single engines. My SRX 600 has a final gear ratio of 1:2.437 (16 teeth:39 teeth), this equates to 55 mph at 3000 rpm in top (lowest rpm at which I select 5th gear). On this same gearing 70 - 75 mph comes up at 4,000 - 4,250 rpm in 5th gear. This is with the engine in a 'standard' state of tune, probably giving 40BHP at the rear wheel at best.

My understanding is that the SLR650 motor is in a soft state of tune and produces probably less BHP at the rear wheel than my SRX, when in a standard state of tuning.

I have attached as jpg images the comparable gear ratios for the 2 models of motorcycle. You should also be aware that the SLR uses a 17" diameter wheel, whilst the SRX 600 1JL model has an 18" diameter wheel that alters the final ratio, as may do the tyre type fitted.

Make your calculations and modify as you see fit, but be aware that as I have previously said, despite their colloquial name of "Thumpers", compared with long stroke 4 stroke singles, short stroke 4 stroke singles are in fact "Revvers" and if you really want a "Thumper" then a Big Pussy 120 (Panther 120, 650cc) might be more your machine.   

Here is a link to a copy of the Honda_SLR_Workshop_Manual: Honda_SLR_Workshop_Manual

My regards, Bill


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