Grubee super rat!

Discussion in '2-Stroke Engines' started by Ixlr8, Apr 26, 2011.

  1. Ixlr8

    Ixlr8 Member

    The other day I ordered my gt5SR. It should arrive tomorrow. In case anybody is interested ,as soon as it arrives I will be tearing it apart. The reason being is to separate the facts from myths on the engine. Lets see what is really inside. I just love to take things apart. Anyway if there is interest then I can take pics and post them, thanks for reading
     

  2. Skyliner70cc

    Skyliner70cc Active Member

    You betcha there's interest! Please please share with us what you find with pics and narratives. Would love to know if displacement is bigger and if compression is higher than regular slant head engine.

    Good luck and have fun!
     
  3. adrian101

    adrian101 Member

    Yes yes please take pictures and post!
     
  4. yes please i would love to see whats up with them before i buy my 6 kit please again :bowdown:
     
  5. Ixlr8

    Ixlr8 Member

    Finally they delivered it, been anxious all day. For sure I will take it apart tomorrow. I also have to figure out how to post pics. I'm sure it would be as easy as an attachment, I hope. One thing I did notice after first opening is that the outside casting is actually pretty good. This is compared to my other 4 that I have. Planning on tearing one of my other ones apart in order to make a direct comparison.

    would like to also add, that I appreciate the enthusiasm that is shown here, thanks
     
    Last edited: Apr 27, 2011
  6. yes, anything you would like to post i would love to see. as i was thinking of ordering another engine (for my 2nd build) and i was kinda leaning toward the super rat. but i would like to know if there is much different with it. looking forward to seeing what you find out!
     
  7. OBXbiker

    OBXbiker New Member

    congrats man, I got mine, got it running... and it has some get up and go! only modification i made was adding a boost bottle, and one of those cool Pirate Cycles Clutch stickers!
     
  8. Ixlr8

    Ixlr8 Member

    that's great,obxbiker. Glad to hear you have it going,And that it runs so good. Right now getting ready to post my findings so far. So hold on guys. Its coming.
     
    Last edited: Apr 28, 2011
  9. Ixlr8

    Ixlr8 Member

    Here we go!
    Dont know if I'm doing this right so bare with me. For reference will show pics of old motor and new one, notes after the pic, thanks

    http://www.motoredbikes.com/attachment.php?attachmentid=31454&stc=1&d=1304053729
    this is the measurement most people want to know. The SR is a total length of 7 inches. That is 1/2 more then the regular cdi motor.

    http://www.motoredbikes.com/attachment.php?attachmentid=31451&stc=1&d=1304053099
    some people here were asking this..yes the cdi cover is vented

    http://www.motoredbikes.com/attachment.php?attachmentid=31447&stc=1&d=1304051860
    this is the information tag, notice it shows timing advance

    http://www.motoredbikes.com/attachment.php?attachmentid=31448&stc=1&d=1304052106
    take notice this shows what factory the motor is from

    http://www.motoredbikes.com/attachment.php?attachmentid=31449&stc=1&d=1304052407
    old style intake on lower ..sr upper. old 16.3mm-SR 13.8mm. Unpleasant surprise, but see next pic

    http://www.motoredbikes.com/attachment.php?attachmentid=31450&stc=1&d=1304052802
    Now this tells another story, intake on the engine side..old style- 15mm SR-19.6..this may induce a ramming effect?doubt it, maybe if mounted backwards. just a comment

    http://www.motoredbikes.com/attachment.php?attachmentid=31452&stc=1&d=1304054315
    upon removal of head, was very surprised and pleased with the combustion chamber. Bad pic of squish but does show threads of sparkplug that should be smoothed out. Next pic shows much better

    http://www.motoredbikes.com/attachment.php?attachmentid=31453&stc=1&d=1304053623
    as can been seen here, old head compared to new SR one. Its a very big improvement, I will cc both of them tomorrow.

    http://www.motoredbikes.com/attachment.php?attachmentid=31460&stc=1&d=1304054761
    be very careful on head gasket, Deck height is only negative .006

    that's it for tonight guys, some notes though. Casting is fairly good, Note it does now have a steel sleeve as some venders may have you believe. Will be back to post once I measure the ports, exhaust, intake and transfer.

    Thanks for reading and see you tomorrow
     

    Attached Files:

    Last edited by a moderator: May 8, 2011
  10. Ixlr8

    Ixlr8 Member

    hey,OBXbiker, wanted ,but forgot to ask you. Did you have any problems with the cns carburetor?
     
  11. OBXbiker

    OBXbiker New Member

    yes, im having some trouble with it. its started and ran about 6 times now each for just a couple mins of riding. but its really inconsistent... i am thinking that there isn't enough air in the fuel mixture as it boggs down and then won't restart. kinda frustrating. but on the plus side for my first build and it starting at all I'm pretty stoked.
     
  12. hi Ixlr8 hope your having a good day thanks to you its a good start for me seeing stirp dowm of the super rat thanks:bowdown:
    good job with the pics i had turble with them at first to :jester:
     
    Last edited: Apr 29, 2011
  13. OBXbiker

    OBXbiker New Member

    Good news. The carby is working now. Actually better than expected. Just breaking her in now. Very pleased with how responsive the throttle on it is. Can't wait till after the break in to really see what she can do... just on the couple of quick rides I've done, I've had it up to about 15mph and feels like there is a whole lot left. Call me crazy but definitely more juice than I thought I would get right out of the box.
     
  14. Ixlr8

    Ixlr8 Member

    Did you do anything to make the carb start working?..I have not had the pleasure, or is that displeasure of working on one of the cns carbs. When I was with Husky they used bing carbs. And if you can tune a bing and then make it consistent you had to really know your stuff. So I figure it should present no problem for me when it comes to tuning.We will see. Just to add, husky finally went to all mikunis
     
  15. Ixlr8

    Ixlr8 Member

    Sorry guys, totally rethinking and re-evaluating this engine. Will repost, thanks
     
    Last edited: Apr 30, 2011
  16. OBXbiker

    OBXbiker New Member

    Just adjusted the position on the manifold and tighted up the choke cable. Havent
    done any adjustment to the screws just yet. Gonna get through the break in and then start tuning the idle and the air to fuel ratio. Running the 20:1 mixture is gonna make it boggy so I figure wait till I get to the leaner mix before screwing with them...
     
  17. Ixlr8

    Ixlr8 Member

    Turns out to be used motor!!!

    really to upset right now to post fully, but wanted everyone to know that I was sold a used and defective motor from GASBIKE!...now they tell me they do not have a warrenty nor are they equipped to exchange, repair or replace defective motors, I informed the tech that their terms and conditions says otherwise..HE SAID BULL **** AND HUNG UP ON ME!!!...I absolutely cant believe this!
     
  18. Ixlr8

    Ixlr8 Member

    wanted to add, had I not elected to disassemble this engine for the group. Then I probably would of never known about it being used...till it exploded. It is not only unethical for gasbike to do this but also has the potential to be very dangerous...this engine is very , very obviously used, and damaged..heck the crank is so bad that it was easy to see it was bent, no mic needed. And when I say bent I mean runout of over 4mm! I will take and post all pics proving this as soon as possible.

    Its a horrible helpless feeling when a vender so obviously rips you off and then tells you to get lost...I'm sorry I just have to vent. As stated above I will post pics of my findings, hope somebody will find it helpful.
     
  19. OBXbiker

    OBXbiker New Member

    **** man, sorry to hear it! that is really crappy of a vendor to send you an used/defective item, and then not assist you in anyway to make it right... I have nothing but good things to say about the folks over at Bikeberry! the shipping was a little slow, but whenever I called I got straight answers and were very friendly about it! the only complaint I have is that the universal u bolt engine mount doesn't fit the GT5 SR that i ordered from them, but the wider bolt placement of the GT5 SR actually fit (barely) the frame of my bike. so I'm out a couple bucks but in the scheme of things I'm not worried about it.
     
  20. OBXbiker

    OBXbiker New Member

    oh anyone out there who is thinking about ordering a manic mechanic ported manifold... don't! it won't fit the GT5 SR... the stud placement for the Super Rat is wider than the hole placement on the Manifold... pretty bummed cause i can't get a response from Pirate Cycles to save my life. 4 weeks... 4 emails, 5 calls, voice mail box full, and 0 replies... for such a highly praised company I am kinda bummed that i can't get any response...
     
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