Uh Oh no compression ...

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Joined
Mar 6, 2005
Messages
2,713
Location
Mesa, AZ
Ok, I think I will have to reopen the rocker cover and redo the job, I must have missed something, because after reassembling the bike, and trying to kick it, I don't have any compression. It's as if I was kicking it with the decomp lever pulled. I hear a breathing noise from the air intake, and that's it.

I suspect a bad reassembly of the rocker cover. What else could it be?

Well, I am learning, I had to goof up eventually, I don't think I broke anything.
 
Valves not adjusted right!!!!!!!!!!!!!!!!!!!!!!!!!! That would be my guess.
 
Also when I adjusted the valves, one of the adjustment screw had to be turned at least 5 or 6 full turns before hitting and now that it's adjusted it looks way low compared to the 4 others. It is the right side admission valve. Could it be the reason for my problem?

Now that I remember, I did not have the "no compression" issue before turning that one valve in.
 
I have had to remove the rocker cover twice. Once to replace a adjustment screw and the other time to remove the decompression hardware from the top. What I would do first is remove the adjustment covers and see what its a doing. If you have to remove it all the way then upon reassembly leave the covers off and when setting the rocker cover in place hold the rocker arms up so they don`t foul anything. Its not hard and you get to see what everything is doing. The arms might not be lined up right and you will get a lot of side play as well. Check and see if the decompression shaft is in right if not it can hold the valve open.
Hope this helps
 
Memo to Froggy:
CHECK YOUR VALVE ADJUSTMENT

:D
I bet that is your problem
Do it slowly and make sure you got it on tdc with all the valves fully closed. The valve adjustment will be the most important thing for starting your bike besides the SEM. You already got the carb and jetting sorted so its only the valves unless you
1. forgot the spark plug DOHHHH
2. Stuck a pencil in the hole and broke it off :twisted:
Try agaiin I dont think you should have had to turn the adjuster more than 1/2 a turn.
 
Sounds like you adjusted your valves 180 out (not at TDC). The piston may have been at the top, but probably not on the compression stroke.
 
Nic,

Tried ringing you at home after i got your voice mail but no response on your end. Give me a call before 10pm if you can to let me know what your status of the bike is.

ps. Also got your PM so I plan on meeting you at the 4peaks area at 10am... yamaha and all! :lol:

Regards,
 
LeFrog said:
I suspect a bad reassembly of the rocker cover. What else could it be?

:D :D :D Did you check your muffler bearings? :D :D :D



Log out!
 
Yes I am going to redo the valve adjustement but for some reason the right side admission valve need to be turned in 5 turns before being stuck...

What could be causing that?

Also, yes, thanks, I had a spark plug in. I guess it is the valve, but how can I adjust it if the screw seems to turn endlessly?
 
LeFrog said:
how can I adjust it if the screw seems to turn endlessly?

What exactly do you mean when you say, "turns endlessly"?
 
berger said:
Sounds like you adjusted your valves 180 out (not at TDC). The piston may have been at the top, but probably not on the compression stroke.

How can I find the TDC on the compression stroke, then? Set the bike in gear and back up?
 
Make sure you are at TDC on the compression sroke. This happens just after the intake valves close.

Log
 
LeFrog said:
How can I find the TDC on the compression stroke, then? Set the bike in gear and back up?


1• ignition cover off, valve inspection covers off, sparkplug pulled

2• 17mm wrench on flywheel nut

3• turn flywheel nut clockwise while watching the valves move. for every two revolutions of the flywheel your intake and exhaust valves will open and close just once

4• just after the intakes close, (come back up), the piston is coming back to the top of the cylinder.
The intake valves are on the carb side of the head while the exhaust valves are, well, on the exhaust side (front of bike)

5• this is top dead center on the compression stroke


Logjump
 
Thanks, Log, Sandskipper also told me the same thing on the phone.

I wished I had known this earlier.

Anyway, I think I have screwed something up under the rocker cover. Now I cannot turn the flywheel at all, it is stuck at TDC and cannot turn it by hand.

I would suggest to myself I should reopen the rocker cover, clean up the sealant and check the decomp device.
 
I just opened the rocker cover and everything looks fine, no broken valve apparently, so that's good.

When you put the rocker cover do you have to be at TDC on the compression stroke too?

Question is how do you find it this time? What would the cam look like when it's in the proper position?

I think I will be done with that type of monkey business for a while.

I am starting to get PISSED ;)
 
if the rocker cover is off you have a great opportunity to understand better what is happening.

the piston comes to the top and depending on which stroke it is you have a choice of two. you want the piston at the top with both lobes pointing downwards.

what you had was both lobes pointing up and that is also how you put the cover on which wasn't good.

so both lobes down right? and the ignition mark up in line with the screw hole.

re-fit rocker cover and then do the tappets. your tappets should only ever have wanted a 1/4 turn to set right so you should have become suspicious. log jumps advice is excellent.

i suggest you pull the plug, inspection covers and ignition cover and then start turning the engine clock-wise. watch the tappets bob down and up.

learn the things the engine does. 4 strokes. suck, squeeze, bang, blow. you'll get there. it can actually be fun to watch what they all do.

PS really good to see you're now giving terry hay suspension advice. very good nick, very good. but do you think we could just learn some basic mechanics over here first please?

regards

Taffy
 
Taffy said:
PS really good to see you're now giving terry hay suspension advice. very good nick, very good. but do you think we could just learn some basic mechanics over here first please?

regards

Taffy


:lol: :lol: :lol: :lol: :lol: :lol: OUCH! THAT HURT!!!
 
risky1 said:
Taffy said:
PS really good to see you're now giving terry hay suspension advice. very good nick, very good. but do you think we could just learn some basic mechanics over here first please?

regards

Taffy


:lol: :lol: :lol: :lol: :lol: :lol: OUCH! THAT HURT!!!

Where did Taffy see me give Terry Hay suspension advice?

I happen to know Jeremy Wilkey personally. I don't like someone claiming his stuff is better when his stuff, or the version sold over here, does not work properly and trashes your forks.
 
Brian aka Splat had the infinite kindness to come to my house today and he used a totally different type of sealant than the Threebond, his was translucid, I have to ask him what he used, but that was not where I had my issue that was with the adjustment of the valves so this time he did it and showed me, with the 1/3 of a turn out method.

Loosen up the 10mm nut, turn the flat screw in all the way, then back out 1/3 of a turn and tighten the 10mm nut. Exactly as I did before, following his advice, except that this time we had the piston at TDC on the compression stroke.

Basically, without this knowledge, you have 50% chances of screwing it up, and with my luck these days, I lost the toss.

With the valves adjusted properly, I now have a lot more compression than before and it has become harder to kick start the bike, but I guess that, with boots on and the proper application of strength, the bike will start a lot more easily.

We tow-started it (no comment, please) and after adjusting the idle and mixture screw, I rode the bike up and down my street. I could feel the effect of Dale's tuneup on top of well adjusted valves and I think it's really going to be one great bike to ride.

Oh, also the leak is now gone. The rocker cover job was not useless, it's just that the mechanic had no clue. It's like cooking, you can try with the best recipe, if you can't cook, it will be just good for the dog.

Conclusion: it's a learning curve and I am thankful I have a bunch of husa-friends to assist me.

Now to my second conclusion: I'm going to stick to computers and let mechanics do the mechanical work on my bike.
 

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