I have a problem!! who can help me solve this debacle?

Discussion in '2-Stroke Engines' started by adrian101, May 18, 2011.

  1. adrian101

    adrian101 Member

    I got the billet head from rocksolid engines.

    Now the piston is hitting the spark plug now. It's the normal spark plug that comes with the engine itself (STOCK PLUG)

    How in the cr#p can i make clearance for it to not hit it?

    Help me....... PLZZZZZZZZZZZ :whistling:

  2. Oddzball

    Oddzball Member

    Thicker head gasket.
  3. DuctTapedGoat

    DuctTapedGoat Active Member

    Get a smaller tipped sparkplug.
  4. jaguar

    jaguar Well-Known Member

    take one or more washers off of other spark plugs and put them on the plug you want to use. Have you tested the psi? What is it? If it's above 135 then make/buy another head gasket and put it on.
  5. adrian101

    adrian101 Member

    How do you check the PSI?
  6. Oddzball

    Oddzball Member

    you need a tool that you screw in there. compression tester. you can rent one at like autozone for free, just need a deposit
  7. jaguar

    jaguar Well-Known Member

  8. Oddzball

    Oddzball Member

    Honestly though, FIRST take the head off with the plug in and see if the plug threads go inside the chamber. If so, than your plug is to long, get a shorter one.

    If the threads of the plug dont go inside the chamber, that means the space between your head and Jug has gotten smaller. The correct way to fix this? thicker head gasket.

    THIRD, Did you try to put a angle fire head on a regular motor? You cant do that. You might have got the wrong head to be honest.

    Which head did you buy exactly?


    Ih i see it.. good lord man, you paid 90 bucks for that thing? I dunno, looks hinky to me, I dont see a lot of fins on it either, and I bet it doesnt cool worth a ****.

    Looks shorter than a regular head...
    Last edited: May 19, 2011
  9. motorpsycho

    motorpsycho Active Member

    a shorter reach plug or a thicker head gasket (you may need 2 gaskets stacked).
    but, thicker head gaskets will lower the compression so you may be defeating the purpose of the high compression head by adding a thicker head gasket(s).
    you will have to do like oddzball said...remove the head and screw the plug into it and see how much of the plug is in the combustion chamber. if the threads are in the chamber, you need a shorter reach plug. BUT, you will still have to check the clearance between the top of the piston and the electrode pn the plug. A little secret is to put a thin layer of clay on top of the pistion. then, put the head back on and torque it to specs. install the spark plug and rotate the engine by hand (make sure the plug wire is off). after one rotation, remove the head and look at the clay. if there is an indentation in the clay from the spark plug, you can do some measuring to figure out how much clearance you have between the electrode and the piston. it all depends on how much clay you put on the piston tho because if you put a really thin layer on it, and there is plenty of clearance, the electrode will not touch the clay to make a mark on it. you don't want to put so much clay on the piston that it will make a mess if it gets squished. just put the clay in the center of the piston, right below the spark plug. there is no need to cover the entire top of the piston with the clay because that will just make more of a mess.
  10. adrian101

    adrian101 Member

    LOL i have one of them. I got it with my air compressor as an accessory. haha silly me for not knowing what it was :eek:

    It is kind of shorter but alot larger in diameter. video of what they look like on engines: http://www.youtube.com/watch?v=YOlg3jUYjyM&feature=channel_video_title

    I will do the clay test for sure. Now it is time for me to take the head off!

    Thanks for the info and help.
    Very much appreciated! :bowdown:
  11. Oddzball

    Oddzball Member

    Well odds are if it IS shorter, its probably going to need a shorter plug.
  12. DuctTapedGoat

    DuctTapedGoat Active Member

    Here's a question, and it's not entirely off topic or out of place I don't believe.

    How is it that you purchased an aftermarket head for almost 100 bucks, yet you haven't gotten a sparkplug to replace the stock sparkplug yet?

    Not to be rude or anything by any means, but really a sparkplug is a very cheap and simple upgrade that usually gets done in the first few days, if not before assembly.
  13. jaguar

    jaguar Well-Known Member

  14. rustycase

    rustycase New Member

    You motorheads are far too quick to pull your engines down ! LOL

    Grab a larger paperclip from the desk your pc is sitting at and bend it so there is a small L at one end, a straight length, and ANYTHING at the opposite end that will keep it from falling completely into the sparkplug hole.

    Stick it into the ho, catch it on the bottom of the threaded part, and make a small mark with a sharpie, a piece of tape, or something....

    Compare that length against the plug, with a compressed gasket on it and see where it corresponds. That will get you started on IF you need to pop the head or not !

    ...if no one mentioned, they DO sell spark plug shims used for indexing the plug, but they will be a bit tricky to locate a source.

    ...and who's got clay!!! LOL

    A bit of chewing gum, wadded up white bread, or some flour paste bread dough would suffice for a clearance test at a preliminary stage.

    ...and yah GOTTA have clearance because at high rpm, after the heat causes everything to grow, the crank literally throws the piston up and will exceed static clearance.

    Fun stuff!

    Good luck
  15. Oddzball

    Oddzball Member

    Phht who DOESNT have clay?

    Anyway, frankly i think those heads are hinky anyway. Hardly any fins for air cooling. I wouldnt run one, but to each his own.

    Besides, pulling the head takes 5 mins, provided you didnt jack up the head gasket. And you could be talking mm or less measurements, dont know if a mark on a paperclip would be good enough.
  16. adrian101

    adrian101 Member

    Good question and its not rude at all: Well i got 3 stock plugs with my engine. One i used for break in. One was broken and the other one is plugged in my engine now. I believe they do the job but i have ordered the NKG like listed below and it hasn't shown up in the mail (been 5 weeks now) alittle fishy right?. I have no motorbike/ nor hardware stores local to where i am who sell them. thus have no way of getting them in person. I have ordered the 3 prong spark plug from MBB imports which is meant to be a performance boosting plug which i was told by the owner of the company it matches perfect with the billet heads. So i hope his not lying. If not i will order NGK's from elsewhere and hopefully i get them. :)

    PS billet head $109 including postage. lol

    Awesome thank you. I will use this if the spark plugs i get fail me. :D

    LOL I don't have a paper clip next to my computer :(
    I had to go out a buy clay for the job as i didn't have any. but the gum and flour paste dough would have worked perfectly. why didn't i think of that?

    I placed another washer on the spark plug from a used plug and it gave it the clearance it needed. I have ordered a plug with a smaller reach :)

    I love taken things apart and putting them back together. Helps me learn how everything works and what part goes to another.

    1) I didn't have clay LOL but i do now :)
    2) surprisingly it doesn't have any cooling problem. I haven't notice a big change in temp as of yet. I have placed heat rubber in the cooling fins on the cylinder jug so the heat from the engine moves into the rubber and gets spread evenly. Plus it helps engine noise and vibrations

    Thank you to everyone for there help :) much appreciated:bowdown:
  17. rustycase

    rustycase New Member

    ...That's an Oops!

    Don't re-use a crush gasket from a sparkplug ! Especially stacking them !!!
    They nearly always blow out.

    (Please don't ask how I know all this stuff!)

    Good luck
  18. rustycase

    rustycase New Member

    A, have you noticed an obvious reduction of noise by putting the rubber in the cooling fins?

    I'm kinda concerned about the 'trashy' noise these HT engines throw off to the side while travelling through town.

    << I >> could probably ignore it myself, for a while, but would prefer an engine that is quieter. LOL Had an old harley flathead once that drove me nuts after I put hi-compression aluminum heads on it! I just couldn't hang... got it finished and sold it!

  19. adrian101

    adrian101 Member

    Well I'll just wait until my new plugs arrive. lol
  20. adrian101

    adrian101 Member

    I have noticed a big reduction of noise from placing rubber in between the cooling fin's. Mostly the tinny noise from the vibration caused from the piston going through the jug. Its was sending me nuts until i heard "rubber can help stop that noise" lol.. Now i have to find something that will help reduce the sound coming from the gearing/clutch plate.