Help - Need Advice (warning long)
Posted October 06, 2003 - 07:18 PM
Sounds like the "new kid" might have really hosed things up in there ....good luck,
Posted October 09, 2003 - 11:03 PM
Posted October 10, 2003 - 06:59 AM
Sorry to hear about the problems u are having..I had the same thing happen to me with my 03 450. I feel it is definitly a jetting issue, and I found out the hard way, that the more changes you make with your jetting, the longer it will take you to sort it out. Ok...this is what needs to be done first, imho...Read the jetting q's sticky all the way through..it will take you about an hour or so to do it. In that thread, is literally thousands of hours of research on the issue. You cannot make drastic changes in jetting. I would start with the stock settings on all jets and clip positions..then start by moving the clip..make notes...then move on to another section after you run out of clip positions(main jet) then start with the clip with the new change etc...Please read the jetting q though..u will be an expert in carbs after that!
P.S..make sure the air filter is clean ..this will give u fits also!
Posted October 10, 2003 - 04:54 PM
This is why I recommended checking the needle/seat for damage or crud floating around...if the needle hangs open you'll have a sudden, intermittent rich condition...
The problem seems to be intermittent because the bike runs okay until the plug starts fouling and then the running gets gradually worse until the plug is so fouled that the bike won't run or start anymore. I am pretty sure
Posted October 10, 2003 - 06:00 PM
As an aside, when I put the 42 pilot in, I discovered the shop had installed a 48 pilot (instead of the 45 that the told me). This means that the bike was running on a 175 main jet and 48 pilot. Seems way off the mark for a stock engine to me. Also, because I was away I sent my better half, Sally, into the shop to get the jets for me. They told her that they don't stock those jets because they aren't a Yamaha Dealer. This means they didn't even attempt to do what I requested when I took the bike back in. I asked them to install a 162 main, 42 pilot and needle clip in the 4th position. What they did was install a 170 main, 48 pilot and needle in the 1st position. Also, they said to Sally that it is probably the cam and that I have no idea what I am on about and were really rude to her. Sal then went to the Yamaha dealer and picked up the jets for me. Not happy Jan!
So, it looks like it is not just a jetting issue (come on, where are the "I told you so's" ). I am gonna double check everything now (timing, valve clearances, clean the carby, check connections) but I have to say I am feeling somewhat discouraged right about now. I just wanna ride!
Posted October 10, 2003 - 07:03 PM
After I have checked the timing I will check the valve clearances again. Last time I checked them they were close to max, but within tolerances. I will double check them while the engine is open.
Posted October 10, 2003 - 08:11 PM
Posted October 11, 2003 - 02:55 PM
Posted October 11, 2003 - 03:08 PM
I am pretty confident it isn't an accelerator pump issue. I know the squirt isn't hitting the slide, because when I pulled the carby out for the first time ever I got a good squirt of fuel in the eye! I bet you only to that once ever!
Posted October 11, 2003 - 05:18 PM
When I did the YZ timing awhile ago there was not a long hash mark on the flywheel as the manual shows. Your HI mark is what I found for TDC. My guess is that both of your cams are a tooth off.
Posted October 11, 2003 - 07:41 PM
So in summary, the shop installed the cam, as per the pic in the pdf file from this site, but it appears that they didn't use the timing plug to time the cams to the piston. They then tried to fix the intermittent problem with the jetting and screwed that too by going way too rich on both the pilot and main jet. And I paid them $700 to do this. Next question is....should I take a course of action against the dealer?
Well, back to the garage to fix the cams up and recheck clearances.
Posted October 11, 2003 - 07:59 PM
Posted October 12, 2003 - 12:18 AM
Posted October 12, 2003 - 06:20 AM
when I pulled the carby out for the first time ever I got a good squirt of fuel in the eye! I bet you only to that once ever!
:lol:i dont know what youre talking about
:thumbsup:for not getting pissed off and working thru the problem, now go :cheers:for all the hard work.
Posted October 12, 2003 - 08:40 AM
Glad to see you are on the right track. I think the only problem you have is trying to prove to the shop that they were wrong! If you can, I think they need to reimburse you at least part of the money. Ans the fact that a trainee was working on your bike the first time should get you something. Were they charging you an hourly rate with the trainee working on it?. I would be LIVID!!!
Good luck and let us know what happens!
Posted October 13, 2003 - 10:21 AM
Posted October 13, 2003 - 03:32 PM