1986 Xt600 DIY Dual pickup rebuild
Hello, I recently got a $300 1989 Xt600 from Craigslist. It is an absolute crackhead bike. Everything is spray painted black and it is somehow super grimy... but it is plated and came with an extra engine and parts, so I felt it was worth it.
Anyways, when I got it the carb boots were beyond destroyed, it had low compression and it all the cables were full of paint so they didn't move. After a bit of work, and a the good used piston/cylinder from the spare engine and a grizzly manifold (I actually had a grizzy 600 carb so this made the most sense as the original carbs were not in the best shape) I got it to run. No smoke and it has enough compression for me to use all my 160lbs to kick it over (the compression release isn't hooked up currently)
Now here's the issue, it runs very well at idle and up to probably around 3500rpm, nice and torquey. However after that it completely flattens out, I've ridden an srx600 and this feels about half the power that the srx did.
The carb isn't properly jetted and I am using the muffler from a yz250f, but those shouldn't cause it to have so little power. It feels as if the ignition timing is super retarded or as if the cdi isn't advancing the ignition. I tried swapping the cdi with the spare one in the box, but it made no difference... but they could both be not working.
When I threw in the other piston/cylinder I made sure all the ports weren't clogged/filled with carbon and I lapped the valves etc, freshened it all up. I am stumped, I think it may be the cdi, but if there is a way to test them I would love to know, or is there something I missed?
I may try buying and building those diy cdi's from France.
Thanks,
Nick
Last edited by nickklugs; 30 Jan 2020 at 16:25.
Reason: so other people can find/do this
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