Grubee super rat!

[Ixlr8]

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

 

[Skyliner70cc]

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!

 

[adrian101]

Yes yes please take pictures and post!

 

[proctor-nashua]

yes please i would love to see whats up with them before i buy my 6 kit please again

 

[Ixlr8]

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

 

[back2theborstal]

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!

 

[OBXbiker]

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!

 

[Ixlr8]

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.

 

[Ixlr8]

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

 

[Ixlr8]

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