Max_Morley
Serious Thumper
Offline
LT650 Luxury Touring & sidecar rig
Posts: 1490
Moses Lake. WA
Gender:
|
Well I opened mine up today as the tensioner is due in this week. Bike has 36,169 miles showing. 2nd tensioner was out 19.0 mm. but still straight. this was replaced at 26,660 miles. Measured the new special ordered and old chain both at 126.76 mm. There is 0.2 wear on the front guide compared to the new one. No visible wear on the rear one. When I put the old chain on the old cam gear and the new chain on the new cam gear I can visually tell a difference in the space between the root of the gear and the chain side plate. So far that is the only place I can tell the chain sits closer to the crank and would extend the tensioner. The old cam gear doesn't seem to have any wear, can not be felt with a dental probe over the discoloration to shiny part. but the chain does sit lower in that gear. Also measured the cam journals on both the old cam and new one, same size. Gear end journal is 0.002" undersize on both which would drop the cam ever so slightly toward the crank. If I can figure out how to do the pictures I've taken I'll add them later, if not, Greg can I e-mail them to you. Still leaves me puzzled as to where the wear/slack is to put the tensioner out so far. The crank gear was replaced last time as I broke it. Both gears, both guides, cam, chain and tensioner (with Verslagen2 mods ) will be replaced this time. I have another head/cover, cylinder, piston and new rings on hand, but the original honing hatch marks are visible in the cylinder so I'll save that for another time. I plan to re-inspect everything again tomorrow in case I missed something. I use a little oil and had thought maybe I had scratched a cylinder when I went to Wyoming over a 9000 ft pass in the snow/freezing weather. Suspected the cold air may have distorted the cylinder enough to cause some damage as that trip was the first time I used oil between changes, but so far no sign of that. For those that wonder, you can pull the head if you remove the front 2 and lower rear engine to frame bolts (those 12-14 inch ones that go all the way across the engine), at least on my 96. This tip was posted by Greg before I believe but I could not find it in the tech section today. For those who wonder about how much they could raise the compression ratio, don't see much room around the outer edge of the piston, there are no carbon deposits there, only clean aluminum, so it must be close enough and have enough turbolence to scour that part clean. I'll post again tomorrow. Max
|