Been busy these final couple weeks doing all types of issues like raking leaves ,using bikes ,portray my neighbors home ,using bikes,going to automotive reveals,engaged on my wagon and at last I acquired all the way down to enterprise with my motor construct for my pal John .Again in August on the Classic Japanese Bike Present & Swap Meet he purchased this 1965 Yamaha Massive Bear Scrambler .It wants a complete restoration and I’m rebuilding the motor for him. Introduced the motor residence in my truck and the bike went residence with John to Tennessee .Effectively,the opposite day I lastly acquired all the way down to enterprise on it.
The motor is caught, We acquired it to spin utilizing the rear wheel so this informed me the kick shaft gears are damaged and I would like to separate the case. The opposite day I did this job and cut up the case then eliminated the crankshaft and transmission .At first it seemed good simply the damaged kick begin stuff wanted to get replaced so I dug out the later model of them that are stronger and interchange with the sooner ones and acquired that mess fastened.
As you may see the substitute gears are stronger with much less enamel which might be thicker .This was a typical drawback and that is how Yamaha corrected it at serial quantity 26060 in keeping with the manufacturing facility elements guide . So,all was going effectively and yesterday I cleaned the crankshaft ,the engine instances after which began on the piston assemblies once I noticed an actual drawback. One of many wrist pins had a really worn spot the place the small finish bearing rides and it was additionally tapered to at least one facet.This tells me there’s a significant issue with a connecting rod being barely bent. I seemed on the crank and after watching it endlessly I may simply make out a really slight bend on the left facet con rod.It was barley detectable however that is all it takes so I began to consider an answer.
I had a cup of espresso and determined to dig out one other motor with an excellent crank and use it for the elements I would like. Obtained it on the bench and aside earlier than dinner .
This motor was initially going for use within the bike I constructed for my pal Tony again in 2007 however I ended up utilizing a 305cc for that bike so it sat on the shelf since then amassing mud. I am glad I lastly discovered an excellent use for it.Fortunate for me I’ve a pair extra and I do not actually need that many spares now as my days of constructing these are nearing an finish. So,after a pleasant dinner with my spouse I went downstairs into the basement and cleaned the crankshaft . Checked all of it out and lubricated it so it spins actually easily and known as it a day .
The case is all cleaned and able to go , the crank drawback has been solved, it is an attractive day and going to heat as much as about 50 F in a while so what I’ll do, RIDE ! Afterward after my trip I am going to clear up each transmissions and evaluate them .I am going to use the higher one if there’s a higher one.From first look they each look actual good. Effectively,it is virtually 10:30 within the AM and beginning to heat up some so time for me to placed on the leathers and hit the highway . It is good being retired .