Jump to content

Purple Power 421 Serval


Recommended Posts

Thank you!! So didnt get a chance to truly shake this thing down due to constant rain in TX but loaded it up for LSOK and it ran great all weekend. I was rich on the pilot still so it was kinda laggy and took a bit to get back on the pipe but overall im pleased with the new setup especially after trimming the springs on the slides (my thumb was bleeding by the end of the weekend). It was great to meet everyone and i look forward to next year!

238abe4725cb8fc8f28bf6b42c2ef22a.jpg

215f7c063d1e4d3af1195a95def2e936.jpg

1e787fece9907c42f4a620d37c06e52c.jpg

933391b7bc255372b646345a2e14dbc3.jpg

d3ea200ee1c3008f7fe548693bfbf246.jpg

Props to DDQ on this sick pic a39165e794a35d4ded6c6a1ee217be84.jpg

8877365353d811d7228fffe9a8ba0f25.jpg

For this trip i ran 6 stock clutch springs with the lock up and i think i toasted the clutch. Swapped back to 3hd and 3 stock springs and went riding this weekend and feels like its slipping until 4th gear. I will order another clutch and see what happens. I dropped down to a 48 pilot (ran a 50 at LSOK at similar temps) and richened up the needle and it pulls cleanly through the powerband now and is very responsive.

Currently at 48P, 158M, and CEL needle at 2nd clip from bottom.

7634c4054bba83c0311e377cc4c44c64.jpg


Sent from my iPhone using Tapatalk

Link to comment
Share on other sites

On ‎7‎/‎22‎/‎2018 at 7:48 PM, dano3 said:

 

 


I see, do you consider the cracks acceptable then? Curious on your opinion regarding the variation in the crank web width as well. Measurement B below varies from 2.111” to 2.126” on Flywheel side (side with cracks) and is 2.131”(+-) .002” on PTO side . Checked in 4 spots using a dial caliper.


cba93e77934efab48c3cdd1a96255fcd.jpg


Sent from my iPhone using Tapatalk

 

no expert here but I don't like seeing cracks. cracks are never good and it sounds like you weren't happy about it and I wouldn't be either. nobody would.  doesn't look like a professional job IMO. just a guess but what I think,  they welded the pins into the inner webs on the bench.  then installed the bearings onto the center pin and tried to push the outer webs onto the inner web assembly. so the full pressing force was on the welds. from what ive seen from some shops is, it appears they assemble the crank fully then weld. with a quality weld I don't think youll need to go fully around the pin. all that does put a ton more heat into the part. you've still got a press fit and then just a couple smaller qaulity beads to reinforce the press fit. besides that, if the shop isn't careful with beads all the way around the pin, a bead that's to high can grind into the side of the bearing when the crank turns

Link to comment
Share on other sites

  • 4 weeks later...
On 10/29/2018 at 12:00 AM, registered user said:

no expert here but I don't like seeing cracks. cracks are never good and it sounds like you weren't happy about it and I wouldn't be either. nobody would.  doesn't look like a professional job IMO. just a guess but what I think,  they welded the pins into the inner webs on the bench.  then installed the bearings onto the center pin and tried to push the outer webs onto the inner web assembly. so the full pressing force was on the welds. from what ive seen from some shops is, it appears they assemble the crank fully then weld. with a quality weld I don't think youll need to go fully around the pin. all that does put a ton more heat into the part. you've still got a press fit and then just a couple smaller qaulity beads to reinforce the press fit. besides that, if the shop isn't careful with beads all the way around the pin, a bead that's to high can grind into the side of the bearing when the crank turns

 

When i got the crank back the first time it did rub on the bearing when rotating it with it installed into the bottom case. I just cant believe a reputable shop would send out something like this the first time, and then not even spend the extra time to make sure it was 100% perfect the second time around.

Link to comment
Share on other sites

6 minutes ago, gusto said:

would love to hear who ...

 

Hows the bike ? Like the engine? Have more vids?

New setup is good minus some clutch issues i will expand on below. I have been waiting on a new clutch basket collar so have not ridden it in a few weeks. I have to play around with YT settings more because this video is crystal clear on my computer but looks like shit once uploaded. 

https://youtu.be/ZAVbscg_cfw

 

Link to comment
Share on other sites

So as i mentioned clutch would slip until around top of 4th gear. I assumed i glazed it or wore it out running the stock springs but think its a combo of running shorter stock springs and mobil 1 5w-30 that did it.

Camatv told me to check the spring free length and the springs i was running were all .030-.050” shorter than the spec and look like they were ground down at some point (got a bag of springs from seller of the lockup). While i had the clutch out i noticed a lot of play in the clutch basket and found my brass bushing was worn out. This play was also chewing up the fingers on the friction plates. Pressed in a new bushing set from redline and waiting on a new clutch basket collar bushing since mine had some wear on the inside. Also replacing both thrust washers. I have a new driveline clutch i will be installing with 3hd and 3 stock springs and will run different oil rated for wet clutches. Frictions and plates were in spec for thickness but i did have friction material in the oil when i drained it.

Old bushing
8a797f0211fce86da1921e61b875cc36.jpg

New bushing
3ac775c86ec6f9f5242bff357c4c55b9.jpg

And wear on the frictions. This allowed about .021” gap in the frictions and basket
6d4599552224953d50bd6df362b3971b.jpg


Sent from my iPhone using Tapatalk

Link to comment
Share on other sites

hmmm, now I have to check out a used clutch basket I bought with FAST hd clutch.  The fingers of the basket are all super tight against the fingers of friction and steels.  I wonder if its the same problem?
 
How much time was on that clutch bushing?


Mine had a bunch of play between the friction fingers and clutch basket fingers so sounds like the opposite of yours. With the new frictions they are tight to the basket.

When i pulled/pushed on the basket at 3 and 6 o clock position i could see the whole basket move and the frictions would slide back and forth which wore the fingers on the frictions out. Regarding the clutch bushing, im not sure but im guessing it was original so probably hundreds. I did not know to check that when putting my engine together so i didnt replace it.


Sent from my iPhone using Tapatalk
Link to comment
Share on other sites

  • 2 months later...

Been out a few times since swapping in the new bushing/ clutch. Going to start playing with some weight on the lockup next time out.

ca22451d2b5c0413ab5c414044ed9464.jpg

2d41657b6612075a159b3b14b1db7ef2.jpg


And waiting on tie rod ends to throw these on. Lonestar +2 stem. Precision bar clamps and pro taper contours.
010b1ba5f7379964f222c6f945ca31ce.jpg

40d8c4365f972ad781c8fd1e2fb822b8.jpg


Sent from my iPhone using Tapatalk

  • Like 1
Link to comment
Share on other sites

  • 1 year later...

Thanks Gusto for reminding me about this thread. Last march riding trails I pulled in some muddy water and bike stalled out. Tore it down and had cylinders ported by redline and replated.

 

2019 BHQ fall ride LOL

56c63d2511d0f4a67a3c73d6e0110b70.jpg

 

93a3453bd9e1b1bc89fce8f04a5f22da.jpg

 

And went back 1 week later

 

639027bef055c97fb0c13a61a8cfc397.jpg

 

a20929552b298bf8ea5c6b69cbe73163.jpg

 

Picked up a fireball stock length swinger, tusk axle, and JDS sprocket/rotor guards.

 

33bbf30055c0c943b3efceeba9edd6cd.jpg

 

f1c0d714e0f96edb65d19f2d7c6e88f9.jpg

 

Next up want to have these elkas rebuilt/revalved as i have never been too happy with them as they are extremely stiff.

 

 

Sent from my iPhone using Tapatalk

 

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...