Messages

1

General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 05, 2013, 01:13:01 PM »

Used to grease the snot out of the filter base. THe DT1 has a neoprene base and they say do not grease it. Been using them for a while now and really like them. Had not had a problem in the past. I checked the filter base and the air box surface and there was not an area that looked like there could be a pass thru. It had to come from the bottom of the filter when it came out. I am going to try the foam I use for heavy mud in the vent at the bottom of the air box and see how that works.

Thanks for all the help.

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 05, 2013, 11:50:54 AM »

Ok kind of embarrassed that I did not catch this. Turns out the cable was frayed at the top of the carb. One strand was turned back up inside the housing. It was only sticking intermediately because both times I checked the carb the slide was closed. Pulled the subframe again yesterday and it was stuck open about 1/4 inch. Took the carb off to check it all out and found it. New cable fixed it all. Feel bad I did not find that quicker but glad it turned out simple. Now I don't have to swap all that back over with the new motor.

New question. The YZ250 air intake brings alot of air into the bottom of the airbox. We ride a lot of sand here and what seems to be happening is an accumulation of sand at the very bottom of the filter. Now I change my filters after every ride so it is not "dirty" but at this point. When I changed the filter yesterday I noticed some grains of sand inside the rubber boot between the filter and the carb. I use DT1 filters with the neoprene boot and have had no problems in the past. I believe what is happening is that some dirt falls in the boot when I remove the "dirty" filter. Not sure how to stop that. I was considering closing up the hole in the bottom some and adding air vents to the box. Maybe putting in some foam at the bottom of the airbox. Any experience with this?

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 04, 2013, 10:50:55 AM »

In order to run wide open it needs air-lots of it.It's hard to imagine not a carb issue or air leak.Just out of curiosity,why did you swap the 02 engine and electrics,but go with the 06 carb?

That is a great question. I don't have a good answer. I wasn't planning on having to swap the electronics from the start.

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 03, 2013, 10:38:25 PM »

Mainly the suspension. IT just sounded like a good idea so my son could ride. Quick engine swap. Get a few hours on the bike and swap back to the new motor when it comes in. Wasn't planning on all of this but now it has turned into a have to project just to make a point to myself.
I am going to swap all the wiring in the morning to see what happens. New motor will probably come in about the time I get it all going and I will have to swap it all back. 

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 03, 2013, 01:59:07 PM »

CDI boxes are not interchangeable. Wiring is completely different. Can't find a an air leak and the cable seems fine. Not sure what to do next?

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 03, 2013, 02:16:18 AM »

Good idea. I know the plugs are the same.

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 03, 2013, 01:00:24 AM »

The slide is all the way down. I have checked the routing of the cables to be sure nothing is kinked.
THe throttle is working fine but I will pull the top of the carb off and check it thoroughly. I will also check for an air leak. Thanks

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General Two Stroke Talk / 2006 to a 2002 YZ250. Need some help

« on: July 02, 2013, 11:57:35 PM »

Ok guys I need some assistance. I have a 2006 YZ250. Lost crank bearings in it so I pulled the motor. It is just sitting there waiting for parts to come back from the shop etc. I also have a 2002 YZ250 with a good motor just sitting there. It has a split in the gas tank that makes it very uncomfortable to ride. So I pulled the motor out of it and with a few minor mods at the swing arm I put it in the 2006. I am using the carb from the 06. Pretty much everything but the motor itself is 06. After getting it all together it fires on the first kick. Now for the problem. It is running wide open. The throttle is closed and it won't idle down. We turned it off with the kill switch. Made some adjustments and tried again. Same result but this time the kill switch won't work. Finally got it stopped. Pulled everything back down and I can't find anything. All of the electronics and the carb are 06. No changes there. Any ideas. Thanks.

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General Two Stroke Talk / YZ250 Engine Question

« on: May 10, 2013, 03:30:56 AM »

Ok turns out that it was just Alum build up and I was able to clean it with the Muratic Acid and water. Polished up nice. New top end fixed the problem and he rode it tonight. Thanks for all the help.

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General Two Stroke Talk / YZ250 Engine Question

« on: May 08, 2013, 02:25:10 AM »

How can you tell for sure that is nikasil plated? Is it just too hard to be honed. I was told today about using a 1:1 ratio of water and muratic acid with a scotch brite pad.
Would it hurt to try honing to see if it works?

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General Two Stroke Talk / YZ250 Engine Question

« on: May 07, 2013, 11:24:53 PM »

OK new question. Found out that the rings had seized on the piston. Got everything I need for a new top end build. There is some minor scouring in the cylinder however. Not bad but you can feel it with your finger. Can I hone it with good results?

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General Two Stroke Talk / 2 stroke project (Update 20/05)

« on: May 07, 2013, 04:34:15 PM »

One of the reasons we went back to 2 strokes (other then the obvious cost reason) is that it takes more skill and technique to race a 2 stroke great. To be successful you have to master all of the controls not just the throttle. 4 strokes tend to lead to a more lazy rider in that proper technique is a little more forgiving in my opinion.

Also agree with cnrcpla in that 2 strokes are easier for the basic motodad to wrench on.

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General Two Stroke Talk / YZ250 Engine Question

« on: May 07, 2013, 03:03:07 AM »

You know I thought of that as I was typing the first post and I hope it is that simple.

14

General Two Stroke Talk / YZ250 Engine Question

« on: May 07, 2013, 02:37:06 AM »

It is not seized. If anything it is kicking smoother than it was. It will not crank. About every third or fourth kick you get a little backfire type sound thru the pipe but it doesn't crank.

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General Two Stroke Talk / YZ250 Engine Question

« on: May 07, 2013, 02:29:20 AM »

Ok. I brought home a very nice 06 YZ250 tonight. Did a quick service. Cleaned all of the old gas out of the tank and carb. Changed the oil and filter etc..... Bike was hard to crank but it had not been ridden in a while. Got it running OK. Kickstart seemed stiff and choppy feeling. Not smooth like our other YZ250. Rode it around very easy for a while and then picked it up a bit. About 2 minutes in it just died. Will not crank. I am getting a little bit of a backfire now. Haven't had time to diagnose anything yet  just put it up for tonight and will tackle it tomorrow but just thought I would ask you guys for some opinions. Any suggestions? Thanks