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Thread: Piston wash

  1. #1

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    Piston wash

    Recently rebuilt Raider engine bored to 1200 with 14 hours on it, just pulled the head to repair a stripped spark plug thread.

    What do you guys think of the wash? I'm thinking it could be leaned out a bit on 1 (first pic) and 3 (bottom pic), what about the middle pic cylinder 2 though, leave or richer?

    Max rpm's top out on the TinyTach Comm at 6,790, hoping for a few more if leaning 1 & 3 will help a bit?







  2. #2
    Posted this in someone else's thread with the same question Click image for larger version. 

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ID:	337986 More experienced people can chime in but according to that pic I'd say you're maybe on the rich side for 1 & 3? Not a pro or anything just do a lot of reading through threads lol

  3. #3
    Prism's Avatar
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    I'd say the same. 1 and 3 are slightly rich but safe. 2 is about perfect. If you tweak them, don't go crazy. Small adjustments and keep an eye on wash. What is the optimum rpm for that engine? I'm used to GPR engines turning 7150 to 7380. Not sure what yours should be. Don't overload it.

  4. #4

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    Cheers for replies, same here Salt, a lot of reading, great to have advice though! I'd seen the same pic before, couldn't remember where though


    Prism, standard rpm I think is 6500 for the Raider 1100 with rev limiter just over 7000? A few emails to GroupK (very helpful guys!) and they say bored out with standard 38' carbs you should be aiming between 6800 and 6900 so it's not far off. I'd be well happy if I get another 100 rpm out of it with a bit of careful tweaking. Not sure it would make that much difference though with a 1/8th turn in on the high speed screws on 1 and 3 and leaving #2 alone? What rpm increase should you expect from small adjustments?

  5. #5
    Flying Scotsman's Avatar
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    I would say 1 and 3 are ok 2 needs more pistonwash.
    More fuel = more wash.

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