removing Yamaha DT250 flywheel??

[750Y]

How do I get this off? I don't have the proper flywheel pulling tool & i don't fancy buying an overpriced genuine Yamaha part to use once. is there a backyard trick i can use? bush mechanics speak-up please. before anyone asks, my shed isn't wired for 3 phase yet so i can't weld anything up.

[Motu]

You need a special puller all right,there is an internal left hand thread in the flywheel - I have a couple,PM me if you want to come and get one.Otherwise the standard trick is a screwdriver or two behind the flywheel (if you can) then a good smack on the crank while applying pressure on the levers(put the nut back on the crank and use a soft faced hammer of course) If you are by yourself you will need all your limbs for this,toss the bike on it's side.

[merv]

1. Hopefully someone in your area will have a flywheel tool of some sort that will fit. 2. Otherwise, check out Repco for something that might work at hopefully a much lower price.

3. Failing all that there is the hammer solution, but take care. Tap the flywheel lightly around its circumference near the outer edge where your taps will be transmitting down to the centre and not at the inner edge where you might break the thing - the small taps can sometimes do wonders on flywheel tapers like they do loosening tapers on ball joints. Then you can wedge hard timber or the like between the back of the flywheel and the casings and use a large punch or the like and tap the end of the crankshaft - do what ever you have to to avoid rooting the thread, they usually have a well bevelled end. Don't get too carried away or else the thread will suffer. If it still doesn't come off you have to go back to options 1 or 2 i.e. borrow or buy a puller.

[merv]

OK Motu posted just as I was writing this - he has a puller - best you borrow it.

[750Y]

thanks guys, I'll carefully give the diy methods a shot, not much access to the back of the flywheel tho for screwdrivers. Failing that, I may take You up on that offer Motu, Thanks. BTW this is that bike i mentioned a few weeks back, ended up being a 76 DT250 same as in this pic.

[Motu]

But not in that condition eh? They had a ton of grunt for their era - but be careful on the dirt,they like to swap ends real quick! Twin shocks are almost unriderable off road these days,but some can still ride them fast.

[750Y]

But not in that condition eh? They had a ton of grunt for their era - but be careful on the dirt,they like to swap ends real quick! Twin shocks are almost unriderable off road these days,but some can still ride them fast.

lol, sadly she doesn't look anything like the pic 8-(.
the previous owner warned me that it had some 'power-thingy' that made it 'go faster all of a sudden'. It looks pretty basic to me but I imgaine it'll be a bumpy ride over uneven terrain. oh well time to get up off my ass for a change and stand on the pegs using my legs as shock absorbers lol 8-). i might get to like it & come eat some of your gravel one day motu. probably be good for me to come over to the dirty side for some fun.
as a matter of interest, what the hell are all those little rubber blocks that come with the triangle comb thing?

[digsaw]

umm sounds like yar got a spare reedvalve with it,and i got a puller for ti too

[Motu]

They could be quietening blocks that go into the cyl fins,without them they sound like a not very melodious steel drum band.Or yes,a reed valve block.Yamaha's of that era were quite sophisticated,they had 7 ports and reed valves which gave a wide power spead as compared to the piston porters with their knife edge power band.

[750Y]

um... right, these two strokes are bizarre, lol.

[merv]

thanks guys, I'll carefully give the diy methods a shot, not much access to the back of the flywheel tho for screwdrivers. Failing that, I may take You up on that offer Motu, Thanks. BTW this is that bike i mentioned a few weeks back, ended up being a 76 DT250 same as in this pic.

If you can only fit screwdrivers in behind and nothing softer like a wedge of timber be careful you don't bugger the gasket surface on the edge of the crankcase casting. As you've had the offers I would jump straight to borrowing a puller a forget taking any risks with your nice aluminium castings.

[750Y]

If you can only fit screwdrivers in behind and nothing softer like a wedge of timber be careful you don't bugger the gasket surface on the edge of the crankcase casting. As you've had the offers I would jump straight to borrowing a puller a forget taking any risks with your nice aluminium castings.

OK, had a go at the screwdriver method,(didn't damage anything but good point Merv). Looks like I'll be taking You up on that offer Motu. I'll PM You.
thanks for the help guys.

[2_SL0]

I can have a looksee if you want.

[750Y]

hey that'd be cool JB. do you have a puller? i can hopefully borrow motu's one then i'll be able to do it myself...
pm me
cheers
...Dave

[750Y]

well thanks all for the help & the offers guys, I appreciate that. I took it to a guy I know who took it off. when it was finally released it made a resounding yet satifsying CRACK! 8-) all good, so now the hard part... complete disassembly, new piston,rings & bearings. time to get the book me thinks.. & Motu You were right, the rear suspension sucks, lol.