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Engine bogs/Air leak?/Gaskets? Help please

I

ibeenjammin

Guest
OK, I have been scouring this forum looking for who uses and does what, but I still haven't found what I am looking for. I have been playing email tag with mike from Simpson motor bikes. Here is what I have done thus far. I put a 69cc (mike corrected me in saying it wasn't actually an 80cc motor (which I am OK with)) motor on my mid 80's Nishiki Colorado (Bright Yellow and Blue). I broke the motor in "supposedly" then I added some cruiser handlebars and a comfy seat to my bike. After adding the cruiser bars, I had to replace all the cables on my bike to accommodate the new bars. Before I added the seat and handlebars, this bike ran like a horse, it would charge up hill no problem. So, before I replaced all the cables, I took everything off the bike, sanded her down and painted her primer black. Oh yeah...primer black. When I get a chance, I will post a pic on this thread. Although, while I was sanding my bike, I had placed my motor on its side. About an hour went by when I noticed that my motor was sitting in a pool of fuel/oil. Thinking to myself....hmmm...that can't be good. Oh well, I picked it up and stood it upright. This is the only thing that I can think of that I could have done to create my new problem. Does this make sense to anyone? So, after putting everything back together, my bike was no longer running strong as a horse. I would give it some throttle and my motor was literally laughing at me. After searching this forum I figured I should check my intake gasket. Sure enough, the lower portion of it was gone, it looked like it just disintegrated away. I bought some gasket material to make a new one, but it was rubberized and I read something on this forum right after I bought it saying not to use it, so I used the cardboard method with some permatex gasket sealer (brown in color). The next day when I went to ride my fixed gasket, it definitely seemed to work a little better, but still not great. After about 15 min of riding, I noticed the brown gasket sealer bubbling out. I figured that can't be good, so I went and bought a black tube of permatex high temp stuff(didn't notice that it was gasket making sealer) and put it on a new cardboard gasket I made. Before I installed it, I filed the intake flange and the motor, hopefully making it flat. Installed the new gasket, seemed to work ok, but still not great. I read something about the carb not seating properly on the intake, so I filed that down to the clamp. The carb is now seated all the way onto the flange. It is working a little better yet, but still not as great as it was before I took it off to paint my bike. I kept noticing that the bottom of the carb would have fuel/oil on it. Then I started noticing fuel and oil on the bottom of the motor. I finally realized, it was coming from the fuel line. I took the carb apart and cleaned it thoroughly. The fuel inlet and the jet were completely clear. When I put the fuel line back on. I used a copper wire and wrapped it twice around the post, then added a zip tie just above the fuel intake to stop the leak, which it did. Although, with all the leaking fuel, could that have caused my problem with my motor? I initially contacted Mike from Simpson to get a new gasket pack to replace all my gaskets. He told me not to replace all the gaskets. He suggested to fill the jug with 20 psi of compressed air and listen for the leak and replace the gasket that is leaking only. Does anyone have any good ideas on how to do this? Then, browsing permatex's website, they suggest using their moto gasket maker. No paper, just spread this gasket sealer on the two pieces of clean metal and screw everything back together, but do not use locktight on those bolts and screws (thanks ThatsDax) unfortunately I read that one a little too late. Fortunately, I used the blue locktight and removal of bolts has not been an issue yet. Locktight made sense for me, because my lower motor mount disappeared, even after just tightening it down, as well as my CDI. I ditched the bolts for the CDI and just zip tied that sucker. So, after everything I have done thus far, the bike will not climb hills like I it did before I took the motor off. Although, as long as there is not a hill, the bike seems to work decent. Is there anyway to get my low end back? What is the best method for gaskets? Gasket material or just gasket maker? Who is doing what? Does anyone take their motor apart and redo the gaskets on a regular basis? Sorry for the long post, but hopefully with the thorough explanation, maybe someone can make sense of this for me. Thanks in advance for all of your help.
 
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T

thatsdax

Guest
You need to do this..

Check your Compression. It needs to be 90 pounds or higher. Test with throttle wide open. MY guess is that since you had such a large piece of your intake gasket missing, you caused a lean condition burning up some of your top end. But..You will not know if that is true until you do a compression test. Enjoy the ride..
 
I

ibeenjammin

Guest
Thank you for the reply :D Unfortunately, I am a newbie, if you couldn't already tell. I really aprreciate your tip, but how do I check the compression. Could you please explain how to do it? If I burned up my top end, is there something that I can do to fix it? what does it mean to burn up my top end? Sorry to sound like a complete idot :???:

Thanks again,

Ben
 
T

thatsdax

Guest
Well......What you do is..

Go to your local Auto parts store. Buy an engine compression tester for around 20usd or so. Nothing fancy or expensive needed. Take it home. Remove your spark plug. Screw in your compression tester. Ride down your driveway and pedal hard and fast. Open throttle all the way and let clutch go and spin the motor fast . After a few seconds, you will have a compression reading. Check it and tell the room what reading in pounds or KPA did you get. Pounds is preffered. Let us know. Thanks..
 
I

ibeenjammin

Guest
Thanks I will check pep boys after work. :D Is it really necessary to have WOT if there is no spark plug?? :???:

Just called Pep Boys, they want $40 :eek: I just searched ebay and found em closer to $15. Hopefully I will win one of these suckers, the only downside is that I have to wait for the thing to arrive. I'll keep you all posted. Here is the Tester that I just won on FleaBay :D Once it arrives, I will give you all an update.
 
G

gone_fishin

Guest
open-throttle because you want a full-airflow for an accurate reading.
 
I

ibeenjammin

Guest
This is my Nishiki Colorado with new handlebars, seat and a Primer black paint job. I wish I took a picture of it before I made the changes.

Different angle

Here is how I thought I finally got my fuel line to stop leaking, as you can see, it is still leaking but not nearly as bad as it was. Any ideas on how to better clamp this sucker? I am all ears

Here is my intake gasket job. Doesn't look the best, especially that close up
 

spunout

Member
Joined
Apr 24, 2007
Messages
769
you may want to give your screws on top of float bowl a turn if you can (pic #3), to make sure nothings leaking from there. and try a smaller diameter hose...i switched mine and not even using a clamp.
Happy :mrgreen:
 
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ibeenjammin

Guest
Unfortunately it is not coming from the float bowl. It is coming from the fuel line. A smaller diameter is a great idea. Thanks.
 
I

ibeenjammin

Guest
I received the tester yesterday. I will test the compression when I get home from work.

OK, tested it and the gauge read about 110-115 psi. Now what? :???:

Is this good, bad, average? suggestions? Thanks in advance.
 
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