| Author | Message | ||
     Sheepaholic |
Wondering if anyone has any ideas on how to adjust the amount of slip? There doesn't appear to be any kind of adjustment available in the workshop manual. Will changing the amount of vacuum be needed or do we have to change springs and/or plate thickness? Is it possible to disable the slipper ? This is a track only 1125r and I prefer more rear grab. Any ideas? | ||
| Schmitty |
I believe the clutch automatically adjusts the amount of slip based on engine speed. It uses the vacuum in the engine, which is based on rpm. Schmitty | ||
| Mikellyjo |
Steve et al, Why would you want more grab? I thought the purpose of the slipper clutch was to prevent rear wheel lock at speed if one inadvertently went down too many gears. Educate me as I may be sewing some wild oats on the track next season. And they tell me knowledge is power. | ||
| Sd26 |
If it's controlled buy vacuum, can you adjust it by putting different size electrical butt connectors in the vacuum line? (Blue, yellow, red?) Used to do that with vacuum lines when removing the blow off pressure valve on a turbo car...was a while ago, and it might not work in this application. | ||
| Hitman44139 |
At like $1500.00 to replace I wouldn't mess with it. Most people are envious that our bikes have them! | ||
| Slypiranna |
Do not disconnect the vacuum line. After just a few miles of riding, the clutch master will go dry and you'll be without clutch action. It seems the slave cylinder's return travel is married to the diaphram/vacuum operation. I found this out the hard way. I disconnected the branch line in testing low speed fueling issues. Took an hour to fix, luckily, no damage was done other than feeling ignorant for overlooking this feature!  mm | ||
| Sheepaholic |
Hi Mikeyellojo, In race situations, some people like more rear drag as it can settle the bike more going into a turn. Some people use the rear brake, and others prefer to use the clutch/gears a little ( me )  Its an individual thing | ||
| Sheepaholic |
Thanks for that info Sly, that was hi on the list of things to try. If disconnecting I may have to try to find a return spring with the right amount of force. I would prefer to find a way to add more grip though | ||
| Ruprecht |
Hey Sheep, have you already got the 1125R? Will you be swapping the SV for the 1125R for the November or December meets at Mallala? | ||
| Slaughter |
Interesting... You might be able to adjust the clutch engagement in the ECM eventually (I understand the capability is in there somewhere)... but that's just something that has been talked about in unofficial circles. On the Inside Pass track day, I found the clutch slippage to maybe be a little "tight" - with hard braking and the rear end really light, it'd still lock up and skip around with aggressive downshifting. So as others have said, it is very likely an individual matter. To me personally, with hard braking, the rear wheel is almost off the ground and in those situations, I'd rather have MORE slippage. Unfortunately, even if you had the ability to change the amount of slip, there would never be a "one size fits all" setting that you would find that worked for you in normal braking and then in HARD braking... although I'd bet that in really hard braking, you'd really want MORE slip, not less. But that's just me, YMMV (cool, I got to use one of those really groovy internet abbreviations! YMMV... I'm so proud of myself) | ||
| Xb9 |
might want to ask Easyrider if there is an adjustment for the slipper clutch action in the race ECM software - he's the only one I know who has the Race ECM kit. I'd be shocked if you can't adjust it with the race ECM kit. | ||
| Diablo1 |
might want to ask Easyrider if there is an adjustment for the slipper clutch action in the race ECM software - he's the only one I know who has the Race ECM kit. I'd be shocked if you can't adjust it with the race ECM kit. Highly unlikely there is any adjustment possible. The clutch isn't even connected to the ECM. The Aprilia 998 motor has used the vacuum diaphragm slipper clutch for 9 years now, and there is no way to adjust the slip. You can however, disconnect the vacuum line on the Aprilia and plug it to disable the slipper and give increased engine braking. What do some of the racers do to get more clutch slip? If they need it, they install a conventional ball and ramp slipper clutch - those are adjustable with a change in the springs.} (Message edited by Diablo1 on September 16, 2008) | ||
| Xl1200r |
What if you built a "t" off the vacuum line with a cap with interchangable heads with different sized holes? A larger hole would provide less vacuum to the clutch and should result in more grabbing action. A smaller hole will increase the vacuum and provide more. Plugging it would have it act as stock. Stick some kind of filter on it so it doesn't suck in water and dirt. Just a thought. | ||
| Sheepaholic |
Hi Ruprecht 1125 is organized, ECM is on hand, Hope to do more setup before rnd 5 of the Hartwell series at Winton 7-9 Nov. Should be at Dec meet.Still racing SV at Mt Gambier this weekend and holding on to it till 1125 is sorted. | ||
| Sheepaholic |
Easiest way at the moment sounds like ECM if that is at all possible (have my doubts but will dig more) Changing the amount of vacuum sounds like the easiest non-destructive way to play. Really need to find out whats happening to the chain converted swing arm before I can adjust much | ||
| Xb9 |
I recall during the pre-production launch at Laguna-Seca, one of the rag's riders (Ulrich I think) was having the Buell tech's adjusting the slipper action through ECM programming. It was written up in Roadracing world. How exactly they were tweaking it I do not know. |
