One wall to go:
Now, something a little more fun, the DRZ motor back together. It had been a stock stroke, 95.5mm bore (447 cc) engine with +1 mm valves and Hot Cams, now it is a +4mm stroke, 94mm bore, for 461 cc's, stock size valves, Hot Cams intake and stock 'DRZ 400E' exhaust cam. I also threw in Web Cams valve springs and titanium retainers, in case I go to something like the RHC 187 cams or something else in the future.
Bottom end coming together, the piston is JE, skirt coated by Swain Technologies. I have done their Gold coating on piston tops in the past, but I've seen more than a few SAE papers now that measured a slight volumetric efficiency loss due to the additional heat in the chamber as a result of the coating (perhaps too effective?). So we'll give this a try as is:
Head is from a spare motor, stock sized Vesrah valves (nitrided), mild clean up work in the ports, chamber opened up slightly to unshroud the valves with the bigger bore:
Checking cam timing. Not adjusting, but just making sure, they were both at 106 deg:
Got the bike buttoned up and took it for a ride today, and did some accel/decels to seat the rings. Feels very nice and torquey, over a small hump at an intersection it pulled the front wheel up in 3rd inadvertantly doing an accel : ) Changed the oil, nothing to note, so now the bike can sit for the winter : (
No comments:
Post a Comment