MotorbikeBruno
Over 1,000 Posts
Well, I've had a myriad of bikes in my life thus far, but every two-stroke I've owned, has never had any problems and I ended up selling each one before they did. So in all honesty I don't really know much about them. I've got 2 new-to-me enduros and I'd like to actually learn something about them.
First one is a 1977 Yamaha DT100 It came to me without a magneto/electrics at all. It now has one and fires up nicely. It takes ONLY 1 wire to work, and thats from the magneto to the spark plug! Gotta love that! It's in super rough shape and I'm going over it right now to see what all it needs to make it ride-able. This one I'm calling the "wife's bike" since she's never been out trail riding ever and I thought I would start her on something small for her first 2-stroke.
Second one I just bought the other day and it's a 1979 DT250. It came mainly intact with the electrics, chain and headlight all in plastic baggies and clean. It turns over with great compression and I just bought a battery today on my way in to work so I think I'll see what happens tonight if I hook all the electrical back up.
First off, is there anything specific I should be doing/looking at on these things?
And when I need to rebuild the top end, how do I know what size they should be? I see 1st over, stock and 3rd, 4th over etc. Seems stock is .25, 2nd over is .50 3rd must be .75 and 4th is 1.00. Do you need new pistons with each set? Does the cylinder need to be bored or anything, or do you just replace the rings going from first to second? I tried to search on here, and I just joined Yamahaenduro forum too. But I thought I would ask this amazingly talented group of individuals since it really is amazing how much so many of you know on here. Thanks in advance.
I'll add some pictures tomorrow!
Bruno
First one is a 1977 Yamaha DT100 It came to me without a magneto/electrics at all. It now has one and fires up nicely. It takes ONLY 1 wire to work, and thats from the magneto to the spark plug! Gotta love that! It's in super rough shape and I'm going over it right now to see what all it needs to make it ride-able. This one I'm calling the "wife's bike" since she's never been out trail riding ever and I thought I would start her on something small for her first 2-stroke.
Second one I just bought the other day and it's a 1979 DT250. It came mainly intact with the electrics, chain and headlight all in plastic baggies and clean. It turns over with great compression and I just bought a battery today on my way in to work so I think I'll see what happens tonight if I hook all the electrical back up.
First off, is there anything specific I should be doing/looking at on these things?
And when I need to rebuild the top end, how do I know what size they should be? I see 1st over, stock and 3rd, 4th over etc. Seems stock is .25, 2nd over is .50 3rd must be .75 and 4th is 1.00. Do you need new pistons with each set? Does the cylinder need to be bored or anything, or do you just replace the rings going from first to second? I tried to search on here, and I just joined Yamahaenduro forum too. But I thought I would ask this amazingly talented group of individuals since it really is amazing how much so many of you know on here. Thanks in advance.
I'll add some pictures tomorrow!
Bruno