Help with my 650r

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Help with my 650r

Post  hmh603 on Wed Jun 24, 2009 6:32 pm

Hello and thanks for looking at my post.
Here are the issues:
The bike is hard starting
When it does run i can hear a ticking or almost a slaping noise that gets louder with higher revs. Im thinking it could be a timing chain issue but i have no idea. It doesn't sound like its coming from the valves
When I grab the brake and let the clutch out it doesn't get worse.
I just did the valves twice to make sure they were right and they are good.
The noise is just alittle too loud for me to feel comfortable with it.

When the bike is running it goes good, but I am also getting some backfiring, or pops from the exhaust. Under hard acceleration it wants to die.

I just cleaned the carb, and will now do it with a manuel and new gasket kit.

The bike has a completely open intake boot from the carb to cylinder, stock style uni filter, and a white bros e series slip on exhaust, any recommendations for re-jetting?

I appreciate any help you can offer, or maybe recommendations of a good shop near NH that knows what they are doing.
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hmh603
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My thinking - but need moer details

Post  Bump on Wed Jun 24, 2009 8:15 pm

hmh603 wrote:Hello and thanks for looking at my post.
Here are the issues:
The bike is hard starting
Jetting

When it does run i can hear a ticking or almost a slaping noise that gets louder with higher revs. Im thinking it could be a timing chain issue but i have no idea. It doesn't sound like its coming from the valves
So it's a higher pitch sound rather than a lower pitch thud?

When I grab the brake and let the clutch out it doesn't get worse.
too bad, that might be cheaper!

I just did the valves twice to make sure they were right and they are good.
The noise is just alittle too loud for me to feel comfortable with it.

When the bike is running it goes good, but I am also getting some backfiring, or pops from the exhaust. Under hard acceleration it wants to die.
Probably rich. The popping is usually from unburnt gas being burnt in the exhaust somewhere. But too much gas can be a few things including jetting.

I just cleaned the carb, and will now do it with a manuel and new gasket kit.
How did you clean it?

The bike has a completely open intake boot from the carb to cylinder, stock style uni filter, and a white bros e series slip on exhaust, any recommendations for re-jetting?

I appreciate any help you can offer, or maybe recommendations of a good shop near NH that knows what they are doing.
No idea about a good shop in NH but Amazon has a good video on Keihin carbs and tuning them. It goes through just these problems ...
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Bump
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Re: Help with my 650r

Post  Thumpmeister on Sun Jul 19, 2009 5:11 am

First off, the 650R is known to kill the timing chains; thats why Honda made an HRC timing chain. Its more spendy, and you will have to replace the upper and lower timing chain gears, but it will last forever. An alternative to this might be a Wiseco Timing Chain off Ebay. I've never used one, nor do I know anyone that has, but I would hope its comperable to an HRC unit.

Secondly, jetting. Borynack has an EXCELLENT jetting guide on his site. I followed it for my piggy, and the jetting is spot-on. Bike starts every time, does not backfire, and has gobs of power. Runs a little rich at higher altitudes, but thats to be expected.

Here is the guide; go about halfway down the page and you will see the charts...
http://borynack.com/XR650R/HorsePowerMods.htm
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+1

Post  Bump on Mon Jul 20, 2009 12:06 am

+1

Thumpmeister wrote:First off, the 650R is known to kill the timing chains; thats why Honda made an HRC timing chain. Its more spendy, and you will have to replace the upper and lower timing chain gears, but it will last forever.

Secondly, jetting. Borynack has an EXCELLENT jetting guide on his site. I followed it for my piggy, and the jetting is spot-on. Bike starts every time, does not backfire, and has gobs of power. Runs a little rich at higher altitudes, but thats to be expected.

Here is the guide; go about halfway down the page and you will see the charts...
http://borynack.com/XR650R/HorsePowerMods.htm
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Bump
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Re: Help with my 650r

Post  bakeray on Mon Jul 20, 2009 7:14 am

Thumpmeister wrote:First off, the 650R is known to kill the timing chains; thats why Honda made an HRC timing chain. Its more spendy, and you will have to replace the upper and lower timing chain gears, but it will last forever. An alternative to this might be a Wiseco Timing Chain off Ebay. I've never used one, nor do I know anyone that has, but I would hope its comperable to an HRC unit.

Secondly, jetting. Borynack has an EXCELLENT jetting guide on his site. I followed it for my piggy, and the jetting is spot-on. Bike starts every time, does not backfire, and has gobs of power. Runs a little rich at higher altitudes, but thats to be expected.

Here is the guide; go about halfway down the page and you will see the charts...
[url=http://borynack.com/XR650R/HorsePowerMods.htm
http://borynack.com/XR650R/HorsePowerMods.htm[/quote[/url]]

Yep the site mentioned and a few others is what I followed. Seems the BRP is sensitive to jetting
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Help with my 650r

Post  ArnieMP on Thu Aug 29, 2013 11:54 am

Please tell my that you have the information that were on the link [url=http://borynack.com/XR650R/HorsePowerMods.htm] available.
The link is not there anymore. Thank you.
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Re: Help with my 650r

Post  Hew on Thu Aug 29, 2013 12:21 pm

Have a look around this site
http://www.xr650r.us/jetting/
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Re: Help with my 650r

Post  Mauser on Thu Aug 29, 2013 3:50 pm

Hew wrote:Have a look around this site
http://www.xr650r.us/jetting/
Or on our site, same info just prettier
http://www.xr650r.co.uk/service/jetting/jetting.shtml

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slapping noise

Post  temporary kiwi on Sun Sep 01, 2013 8:12 am

yes does sound like your camchain is likely cause, id also check the tensioner is releasing properly, the sprockets probably wont require changing, but the chain probably will, their isnt anything wrong with the std camchain setup,the hrc c/chain is not required, very rarely do the sprockets wear out, the camchain tensioners dont usually give any trouble either, but it may be part of the problem, id remedy this prior to doing anything to your jetting, as faulty timing could be why its hard to start

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Re: Help with my 650r

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