Honda CB350 hard to get into 1st gear when warm

[plyzo]

Hello I am working on a rebuild engine and have the bike finally complete. Issue that I am running into is when the bike is cold it shifts fine from 1st, N, 2nd gears. When I ride the bike and get it warmed up I have a hard time getting the bike back into 1st gear. Even rolling or at a stand still. I am currently running 10w-40 oil. Someone mentioned maybe I go up to 20W 50 to see if that helps but wanted to see what others thought on this forum. I have new clutch plates along with springs. I don't think it has anything to do with the clutch but I suppose it could be a possibility. I noticed the Barnett clutch springs were slightly taller than stock so not sure if that has anything to do with the problem.

 

[adventurco]

Could be the oil, could be your clutch adjustment too. Does it shift into first if you feather the clutch and roll the bike forward?


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[plyzo]

The clutch has been modified to be hydraulic.

https://cognitomoto.com/collections/engine/products/cb350-twin-hydraulic-clutch-sprocket-cover

One thing that it could be is the rod might be too short and not activating the clutch properly but why would it work when its cold?