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By Randy Sorensen
I am currently rebuilding my yfz450. I decided to buy the hot rods 500cc stroker kit. I was wondering what jets I need to run. It has full fmf exhaust, uni filter, riding at 800ft. Above sea level. I currently have a ncqv needle on hand along with 170 through 180 main jets, and 45 through 55 slow jets. I don't want to do the trial and error thing for two weeks, what should I start with?
1991 DR250S Dual Sport STREET LEGAL, with only 2,263 original miles. This bike is extremely clean and very well maintained. Clean title. Bike is all stock except for the grips, tires, and mini rear turn signals. Has a Cheng shing rear 4.00" knobby, and a Shinko 244 front tire, under 1,000 miles on it. Everything on the bike works perfect. The pictures do not do this bike any justice, must see in person. Comes with everything in picture plus:
-the license plate bracket plastic (currently removed for a less bulky look, as seen in pics)
-a cheng shin front knobby (the matching rear is currently on the bike)
-a 4.60x18 Shinko 244 dual sport rear tire (brand new, 0 miles, matching front is currently on bike)
-spare turn signals, new in box
-original owners manual
Located just outside Schenectady NY. Only selling because I'm looking to pick up a '01 or newer rm250, which would be the only trade. Price is firm. No spammers, no tire kickers. SOLD AS IS. local pickup only, if you really want the bike shipped, that is for you to set up and pay for.
hey all, yesterday had a DNF from an engine issue, well got it home and in a couple hours of washing and tear down found out it had broke an exhaust valve... the bike has aprox 260 hrs all together, obviously i never thought about when i should be replacing valves, top end has about 60-70 hrs on it (hour meter fell off and didnt notice for a race or too... oops.) it didnt damage anything it looks like other than the valve and the piston.
so onto my questions.
im looking at all the valve options. i have lapped many a valve and have even done a few 3 angles myself. but i dont know which one i should go with being all relatively equally priced? are stainless just as good? if my titanium lasted this long should i just put oem's back in?
only really asking because i am extremely hard on the bike (3 hour races brutal dust and mud constantly tapped out in 5th.)
also because ive seen alot of engine carnage but have never seen a valve break like this.
By Vet Rider
Hi all. New/old rider here. Im 37. Havent raced or ridden for that matter since 2000. Got kids now. One on a 2018 CRF50. Hes 6. So I got a bike to be able to ride with him and maybe get into racing again for myself. Found a clean 19 hour 15 YZ250f. Bike is in immaculate shape. BUT......
What is the trick to get it to start easy?? Something seems wrong. I have been watching youtube videos about the 15+ YZ250F's and other 250F bikes and they all seem to start with one kick. No need to find TDC or anything like that. Warm or cold. With mine its very sensitive about starting and needs to be at TDC no matter the temp. Its very annoying. First time I tried to start it, it took 20 minutes and I was already tired. Then I went looking for info and found about all this TDC stuff. And that would be fine if I wasnt seeing TONs of videos of people getting their new 15, 16, 17 YZ250F's and starting them in one kick. Something has to be wrong. This bike is 2 years old with 19 hours on it. Original owner said it was maintained very well. Didnt get a chance to ask him about its starting, and I dont want to bother him. But it seems wrong. Its not like its a 2000 or something with 150 hours on it.
What could be the issue? Valves needing adjustment? New plug maybe?? I have no issue getting it to the dealer for a valve adjustment. Just wondering what others think.