NE0 Posted October 29, 2014 Posted October 29, 2014 If you're stripping it for the first time, get a digital camera and take loads of photos as you go before and after every bit you take off. It will help when putting it back together exactly as you took it apart. Doesn't matter how many photos you can delete them afterwards and it won't cost you a penny in processing the film!!! You can strip every bit down to its components knowing that a quick look at the Pc or view screen you can see how it came apart.
Moderator Airhead Posted October 29, 2014 Moderator Posted October 29, 2014 are you going to split this engine down mcf?
mcferreira100 Posted October 29, 2014 Author Posted October 29, 2014 Hey PaulDo I really have a choice?Its obviously the right thing to do and would like to do it myself to learn how it all goes together. But I have never stripped any engine before (welder by trade). Been going thru the procedures in the manual and some steps don`t seem to cover what`s required in enough detail for my experience..not to mention some specialist tools reqd. Will probably end up having to buy and borrow tools and take the plunge. Got a buddy that works on old Jawas and Moto Guzzis who could help me (he has a flywheel puller although I`m not sure if it will fit this bike).
Moderator Airhead Posted October 29, 2014 Moderator Posted October 29, 2014 Course you have a choice, clean it best you can rinsing it out with diesel several times and take a chance with it together, or split it...youre choice, Its an easy engine to work on though and the experience will be good for you. There are special tools for Flywheel removal Clutch basket nut removal/re-fitting Crank pinion nut removal/re-fitting Engine casing splitting
mcferreira100 Posted November 4, 2014 Author Posted November 4, 2014 Ok been having sleepless nights over this..but benefits of having 3 DT`s. I think I am going to swop the 1980 DT engine with this one as the 78`s cylinder is already bored out to maximum and the its the one I will definitely want to keep. Can I take it both these bikes carbs and electricals the same?
mcferreira100 Posted November 11, 2014 Author Posted November 11, 2014 Friend honed the cylinder for me so long. Thinking of rather just splitting the motor and doing it properly as further flushing is continuously showing bits and a mechanic buddy has also advised me to rather open it..he advised not to try do it myself though.
erbrod Posted November 12, 2014 Posted November 12, 2014 'Hi fellas, I also had my piston shredded literally as well as the exhaust valve broken at the stem and found that I couldn't get at all the debris in there. I don't know how to upload pics on this forum. I was doing about 70mph when I heard and felt the bang, exhaust gasket shredded pipe blown out . Not cool but engine didn't seize, I have never worked on a motorcycle engine but I have the manual for my 82 sr250 and I feel I can repair it. Ordered all the parts from yamaha new piston, new piston rings all standard since cylinder still is smooth got new gaskets and new exhaust valve assembly. Of course I don't have the special tools required to do all the work, slide hammer for rocker shaft, flywheel puller, torque wrench, valve spring compression tool and that clutch tool. I have to admit I was not intimidated at first but after receiving my new parts and thinking I could do all this without the right tools yea not going to work. The manual makes it look easy and I can do it but it wouldn't be worth the effort if I dont open it all up and clean it proper. My piston head was all gone compared to the small hole on the one pictured, yea there is most certainly more debris in this motor and I will now delay putting new parts in so I can clean it up. By the way this is my only ride now and riding my bicycle to work is not as fun. Fortunately I came across this thread and realise the advice is sound split it and get it done right. Ride safely I'll be riding soon enough
mcferreira100 Posted November 13, 2014 Author Posted November 13, 2014 Well engine going in on Monday..must say, will be nice to have one DT with new crank bearings and seals..shudnt have any idling problems with this one.
erbrod Posted November 15, 2014 Posted November 15, 2014 So how does one split case without splitter tool? Any ideas I have the cylinder bored, new o/s piston and rings new cylinder head, the combustion dome on mine is totally shredded and the exhaust valve stem is fused the seat is also grooved and the exhaust valve rocker arm is cracked where it makes contact with the cam shaft. I was advised to buy another camshaft but I can't find any for less than 65$. This is what I've learned , first disassemble then measure your parts and then shop for parts needed. I am so daft I just ordered parts to replace the visibly damaged ones only to find more damage and then had to return and exchange for different dimensions. In addition to that I just started dismantling with whatever tools I have. I need to really split her because my piston head was totally shredded and I've only got out some debris. If anyone knows anything about which bikes the 82 sr250 can borrow parts from please let me know, thanks.
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