SP1 front shocks bottoming out after fork seal replacement. - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 5 (permalink) Old 09-06-2019, 03:08 PM Thread Starter
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SP1 front shocks bottoming out after fork seal replacement.

Like the title says, my RC has been a great bike, but I am getting sick of the little niggling maintenance issues. I just got the left fork seal replaced, because it was leaking, and now the suspension is bottoming out, with everything on the same adjustment. SO I raised the preload and put everything stiffer, and it still bottoms out while hard braking and if I hit any sort of a bump. It did bottom out sometimes very slightly before the fork seal change.

So, question: did I do something wrong, or are the springs toast? I am 255 lbs with gear, and maybe I am just too big for this thing?

Is there a common mistake in doing the fork seals that might make the bike bottom out? any help appreciated. 2000 Sp1, about 20K miles, wrecked many times, basically a stunt bike.
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post #2 of 5 (permalink) Old 09-06-2019, 06:50 PM
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DId you verify bottoming out with zip tie on the fork or is this what you are feeling thru the bars? If itís actually blowing thru the fork travel I might suspect incorrect oil level. What fork oil are you using? Stock SP1 fork, valves and spring? Did you verify full range of rebound and compression settings after seal replaced?
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post #3 of 5 (permalink) Old 09-07-2019, 09:26 AM Thread Starter
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thanks for gettine back to me.

I did not verify with a quick tie, but it is bottoming visually as you rock back and forth, standing with the front brake on.

I measured the oil volume i forget the exact number 514mL? something like that. It was the stock honda oil reccommended by the book. red oil, I forget the number honda ss8 10w.

Everything is stock, as far as I know. Everything on this bike was pieced together from ebay, and random places, ao I do not know the history of anything.

The range of settings (im not sure what you mean by that) but the adjusters work, and I have everything on almost full hard, and preload cranked way up. like 8 turns out.

I am pretty sure in feeling the fork tubes as they bottom out, the left one is bottoming, and I am pretty sure I did something wrong in changing the fork seal.
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post #4 of 5 (permalink) Old 09-07-2019, 12:37 PM
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Your fork oil type and amount are correct per the manual. Did you bleed the cartridge after filling and check the oil level? Should be 135mm from top of outer tube. Reason I asked about zip tie is sometimes you will feel a shock thru the bars when the suspension doesnít respond fast enough and might feel like it bottomed out. What are your sag numbers? That might give a clue as to whatís happening.
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post #5 of 5 (permalink) Old 09-09-2019, 08:06 AM Thread Starter
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Thanks for everything. I am just going to take the shocks apart, and see what I did wrong. Something is not right, I can feel it, and the shocks are definitely bottoming hard, metal on metal.

I just like to ask a question to see if there is a common simple mistake I made, looks like there is not.
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