george 1100

I put oversized valves and stage 2 yosh cams in my 1277 and lightened the crank and rods(Hayabusa). Runs very strong , super responsive. Cams are dialed in at 102/105 I only rev it to 10k

That's very common. Most looms I've seen have that exact problem in varying degrees of failure

I tried an 2012 1000 basket and it just interfered with the rod. There earlier 1000 may fit as they have a slightly different shape on the outside of the basket but I don't want want to spend the money to find out it won't. Shaft length was also an issue

Maybe it became an issue so on the later 750, they re-engineered it. Every photo I've seen of 85_86 cases has a hole

Correct

Correct

The case cover blocks the hole

If you are at the limit of your tensioner then your chain is operating beyond the manufacturers spec

Similar thing thing happened to me. Bought a set of used rs40s but didn't try them for over a year so couldn't return them. Discovered pilot had broken off and become wedged and no matter what I tried, I couldn't remove it. The cost of a replacement body outweighed the cost of buying a new set. The only thing I didn't look into was to get someone specialised to drilled it out but again, the cost would've been high. I ended up selling the set as is for surprisingly not bad money and bought new

I'll bet you had a tiny bit of grit stuck in the needle and seat. Fouling your plugs at idle but running good at open throttle with 145 jets. The grit now gone . Doesn't explain the plugs with 130 jets though

Needle and seats leaking? Float height?

I had a problem similar to this with NGKs and the thing is, you assume they're working 100% because they're new, so you set off on a goose chase, driving yourself insane until you come full circle and realise the new plugs you put in were no good

Personally I wouldn't run that head like that. Those cracks are decent which could lead to the seats falling out. The cost to fix properly would outweigh the cost of the head. Shortcut repair would be to weld up as is but the risk remains

Zx10 work also but can't remember the year. There was a list of coils on the net somewhere with ohms noted.

I was waiting for that. Absolutely no chance of metal to metal even after a minute of idle

I drop the oil then run the engine on idle for about 5-10 seconds to get most of it out

The oil cooled engine was undervalved imo. It's the single best mod with a compatible port job, you can do. Expensive though

Correct but the 750 spring cannot be used with the ST2 10mm lift cams as they will coil bind

38mm flatslides Basic port job focusing on cleaning up the bowls, short turn and blend and port match 80mm 12:1 pistons instead of spending on cams Slotted cam sprockets No need to skim anything That should comfortably bump you over 130hp. Unless you are chasing big numbers, don't waste you're time with big valves and dot heads imo

I'm just about to make one up for my track slabby but am using a different cowling. Mine will need to support a head cooler also. I'll post up pics. Take yours to a competent fabricator and they should be able to knock one up easy enough

⬆️ this and to dissipate heat from valve springs

It's possible. Also maybe cam timing is out. Did you use slotted cam sprockets? Bolts may have worked loose. Bent rod or rods maybe. Piston may have smacked the head Was it there from day one or did it gradually appear or suddenly appear. How was it performing? I'd be taking the valve cover off for a looksee and checking comp as a starting point

This

Yep, doesn't look right. From what I know, that should not be able to protrude like that unless the orifice has been drilled out

I'm in Aus so price probably not relevant to you. Also had other machining work bundled in so not sure of the price breakdown per item. I bought the sleeves from APE. In short, motor has oversized valves, 40mm tmr's and yosh-2 cams. Power is 'impressive' and usable throughout the rev range