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General Category >> Rubber Side Down! >> Engine bogging down... ideas?
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Message started by RocksimusMaximus on 01/04/09 at 15:57:06

Title: Engine bogging down... ideas?
Post by RocksimusMaximus on 01/04/09 at 15:57:06

So after more than a couple Saturdays, I've finally got a new head gasket on and the whole girl is back together. First time I've done anything quite that intensive.

However...

Once I get a little past half throttle she bogs down pretty bad. Tried to go up a hill on my test ride and she wouldn't get past 25 in 2nd with the throttle WIDE open. This was not a problem that I had before I took her apart. She seems to start up fine... just gotta choke a little bit. And my low RPMs don't seem QUITE as powerful as they once were... but that could just be my memory giving my bike too much credit.

I went pretty much word for word by the clymer manual... so I did adjust the valves... perhaps I did a poor job? Or does this sound like more of a carb problem? I had to screw with the fuel/air mixture a bit to get her runnin the first time.

Any ideas that would give me something to look for when I head back out would be greatly appreciated.

Title: Re: Engine bogging down... ideas?
Post by verslagen1 on 01/04/09 at 16:14:49

Don't Panic, but the last guy who did this had his timing chain off one tooth if I remember correctly.

Did you put the chain on at TDC?
little marks on the end of the cam where horizontal?
and the pin was at 1 o'clock?

Title: Re: Engine bogging down... ideas?
Post by RocksimusMaximus on 01/04/09 at 16:58:59

As far as I could tell I did. I lined up all the marks that the book told me to. However I never really felt any "play" in the rocker arms no matter how many times I turned the dang thing.

Guess the only way to check is to pull it back apart?

Would that cause it to only bog down in the higher RPMs?

Title: Re: Engine bogging down... ideas?
Post by justin_o_guy2 on 01/04/09 at 17:12:19

Gotta make sure the piston/crank stay at TDC while the cam chain is off.

Title: Re: Engine bogging down... ideas?
Post by Stimpy on 01/04/09 at 17:38:00

Could very well be a carb and/or valve problem (perhaps electrical?).
Putting the engine apart again will be your last step if all else fails.

Incorrect valve clearance, dirty carb, lack of oxygen or a mineralized
spark pug (or weak spark) would all cause your engine to greatly
underperform; how's your battery? Lose coil perhaps?

Low RPMs (specially 2dn gear) are incredibly powerful in this model.

Try simple stuff first just too eliminate variables.

- recharge battery
- metal brush your (+)(-) terminals
- clean/change the plug
- test the spark itself
- richen the mix and try a hot plug maybe
(screw counterclockwise about 2turns out)
- do a test run with the airbox door off, vacuum you airfilter
- redo the valve adjustment (must not remove engine at all)
making sure of your TDC (use a wire or your cars' dipstick
in your plug hole as guide). Your exhaust valves could be too open.

Good luck
;)

Title: Re: Engine bogging down... ideas?
Post by RocksimusMaximus on 01/04/09 at 17:39:07

Well I leaned out the fuel/air mixture, just for god measure. Then decided to take it around the block one more time before it got too cold outside... and the throttle performed properly.

I didn't get bold enough to try any hills... but there were no glaring problems on this last little ride. Got up to about 50 on some side streets.

If I had screwed up my timing chain... would there be any other obvious signs? That sounds like the kind of thing that would cause big problems.

Gonna go ahead and ride it into work in the morning, see what happens.

Title: Re: Engine bogging down... ideas?
Post by RocksimusMaximus on 01/04/09 at 17:43:58

7B5C41455851280 wrote:

Could very well be a carb and/or valve problem (perhaps electrical?).

Come to think of it, when I had the problem... my left blinker wasn't working. Then my right blinker wasn't working. But the last time I took it out (when it appeared to work right) both of my blinkers were working... I'll have to check that out too.

Thanks!

Title: Re: Engine bogging down... ideas?
Post by Ed L. on 01/04/09 at 19:13:23

Check the ground coming off the engine, it is a small black wire that runs down to the frame a little behind the oil sight glass.