The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: lfdelrio on November 15, 2010, 11:58:12 PM
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Hi all,
Since I got my LS, I've had issues with the throttle not returning without "user input" (and no the throttle screw was not screwed in). After much reading I decided to change the throttle cables (much needed as the lower cables were VERY stiff), clean and grease the cam (lithium white grease) and twist grip "teeth". and lube the throttle tube with synthetic oil. This resulted in some improvement i.e. if I give less than 1/4 throttle it snaps back shut. However if open the thottle more than that it just stays open until I close it manually. I thought it might be the twist grip and cam assembly being worn down but before I order them i thought I'd post pictures of the and ask if you guys think they are worn down to the level were they might interfere with the throttle return. Also If you guys could tell me wether my throttle cam is the upgraded version or the original it would be greatly appreciated.
Thanks in advance,
Luis
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mine looks worse, but that doesn't mean its not your problem. Have you tried removing any burrs on the teeth.
The problem I had with mine was the ends of the cable didn't sit on the carburettor square and hence were not pulling up cleanly.
John
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Should we assume that you have dismantled and cleaned/lubed the splitter? Dry lube only - graphite powder or something like that.
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I had the same problem and replacing the throttle tube and cam solved it for me.
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I "caused" this issue on the wife's bike once when I serviced the throttle and used grease between the tube and handlebar. Cleaning off the grease and just putting on a light wipe of oil solved it.
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After replacing the cables and you still have a stiff throttle and none of the other suggestions improve the throttle stiffness, the throttle tube and cam gears being worn can cause the problem .
Quick way to tell if you have an upgraded cam assembly, with the upgraded cam, the hole that the cover goes into, is the same size all the way down, not a step like the one you have, so if you decide to replace the cam you will need an upgraded cover as well .
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The point about too heavy a grease on the tube is impt. I did that. Also, too much grease anywhere in the assembly seems to slow things down as I was told by my guru who got mine fixed. Still not a snap-back throttle when beyond that 1/4 turn where you say it snaps too. I'd change that cam chain assembly. Lubing the splitter is a great idea with graphite and watch there aren't any frayed throttle cable wires anywhere along the route to the carbs. BTW, I ordered a new throttle cable once that was already defective as it was stiff to push/pull within its sheath. Good to test it for fluidity! Not every new part is perfect it seems. KISS theory!!!
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Thanks for the replies, I've made sure there's no grease between the tube and handlebar (just some synthetic oil), my cables were all good (I did test the and compared them with the old ones). I haven't tried to lube the splitter but I did clean it (will lube later this week). I will also buy a new tube and cam/cover and see if this helps.
Luis
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Hi Luis
My cam and throttle tube are worse than yours and my throttle is still stiff and 'notchy'. It gets to a point where I have to use extra effort to turn it.
One thing that I did that helped the throttle snap closed was to cut a large teflon washer out of thin sheet and put it between the throttle grip and the throttle body. There is one on our Ducati and it stops some of the binding.
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I replaced the lot, a year later and it is stiff again!.
This is a battle that the bike will always win, hey WTF it makes for a good cruze control ;).
Oh and don't oil the cables, BMW make them self lubing, if you put oil down there they will bind up! :P.
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If you haven't done it already, replacing the springs at the carbs with some new ones might put you over the top for a full return on the throttle. That really helped my sluggish throttle return.
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I know you checked the cables but it may be time to replace them anyway. They may pull easily when there is not a load on 'em but hang up when there is....They are supposed to have a teflon lining which mean you can't lubricate them. Eventually the lining gives way.
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Thanks for the suggestions everybody,
I went to my local airhead shop and bought a new cam and cover, carb springs, and ordered a throttle tube, which should be here by next week, then I'l get to work on the bike and hopefully this will solve my problem.
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Are you sure you don't have a Flander's Throttle Stop Screw in the bottom of your perch? If so it's a knurled thumb type screw about 3/4" diameter that puts tension on the throttle barrel as a poor man's cruise control. Just checking.
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Are you sure you don't have a Flander's Throttle Stop Screw in the bottom of your perch? If so it's a knurled thumb type screw about 3/4" diameter that puts tension on the throttle barrel as a poor man's cruise control. Just checking.
Reread the first line in the OP Mike! lol!
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Reread the first line in the OP Mike! lol!
Woops...