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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #81  
Old 2 Days Ago
xLoneRiderx's Avatar
xLoneRiderx xLoneRiderx is offline
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Join Date: Feb 2021
Posts: 32
Sportster/Buell Model: XLH 883
Sportster/Buell Year: 2002
Sportster/Buell Model #2: NRHS 1250 failure
Other Motorcycle Model: 883 to 1200 WisecoK1655
Reputation: 18919
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Quote:
Originally Posted by brucstoudt View Post
good to know you can get the 883 upgrade pistons from Wiseco.i thought that was dealership only sale.
I got them from https://california-motorcycles.com/en/ a spanish international online store that can serve items from US very quickly (when in stock). I know they also run several international Ebay websites.
Like these pistons as they look strong and classic without those extravagant high performance low profile look
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  #82  
Old 2 Days Ago
Steve9's Avatar
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In my opinion it was the butchered ring gap what done you. Hammer's first run of ten seconds-he knows his stuff.

You will be fine this time!
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'81 Andrews "Y" cams, K. Black 9-1 pistons
'03 1250 stage two thunderstorm heads, 536, mik 42
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  #83  
Old 2 Days Ago
xLoneRiderx's Avatar
xLoneRiderx xLoneRiderx is offline
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Join Date: Feb 2021
Posts: 32
Sportster/Buell Model: XLH 883
Sportster/Buell Year: 2002
Sportster/Buell Model #2: NRHS 1250 failure
Other Motorcycle Model: 883 to 1200 WisecoK1655
Reputation: 18919
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I agree on both comments, thanks Steve9 for lifting my spirits!

Now I'm choosing setup values for my new engine. It will be a XLH 883 with 1200 cylinders and Wiseco K1655 reverse dome pistons @ 9.5 compression ratio. So, this new motor will run 0.5 more compressed than stock 1200, and will have a squish band that mean the combustion will be faster and hotter, if I'm right.
  • Carburetor Keihin CV 40 setup: 45 and 180 jets (Stage I air cleaner and exhaust)
  • Ignition Module: Dyna 2000i - Curve 4 (máx. 30º advance)
  • Spark plug: NGK DCPR8 (1 degree cooler than DCPR7, stock for HD 1200)
  • Gas: 98 octane lead free (previously used 95 octane during my bike's 75,000 mile
  • Andrews N4 camshaft set.
Also will be using Bel-Ray Mineral 20W50 for break-in time and afterward Bel-Ray Semi-Synthetic 20W50; for the tranny/clutch case will keep on using Bel-Ray Sport Transmission Fluid.

Hope all these changes make her feel in a good mood. Please kindly let me know your thoughts on these tuning tips

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  #84  
Old 2 Days Ago
Tomcatt Tomcatt is offline
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Curve 4, Max 28º advance. Do run the VOES.

With good (tight) main & rod bearings & wrist pin bushings you can run the squish clearance below .030". Tighter squish = better combustion. There are .010" & .020" Cometic base gasket and the stock base gaskets are .014. so you can get both cylinders real close to the same. Squish clearance in these engines actually increases as the engine comes up to temp.

The 883 to 1200 conversion pistons result in a nice compact combustion chamber with squish area. Tighter squish makes them work even better and less octane sensitive.
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  #85  
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Cv carb, I suggest 45 & 185 jet. Less lean at 5000 rpm and +.
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