HighLUX

Lux's quarterlyfe crisis and pathetic road legal dirtbike thing

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It's carboning up on the exhaust side, clean on the intake side.

How are your reeds?

 

I still think you have been nanging it too lean on the main jet tbh.

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Carboning up on the exhaust side. Its had a 118mj in it when it popped on the way to east cape ride

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Reeds seem fine but dunno what im looking at other than they seal against the reed block ok

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On 01/01/2019 at 15:54, Vintage Grumble said:

Could it just be how the mix transfers up to the combustion chamber? Might just come up one side easier or something? 

I asked some barry about mine and he said only different squish does this

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I thought those markings on the inside of the head were fairly normal and represented how the unburnt fuel/air entered and the mostly burnt fuel/air left. I dont understand why you would need to change squish on a kit like this TBH

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is it because its the wrong kit for the bike/engine? can you space the whole cylinder/barrel out instead?

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Nope supposed to be bolt on TS50 big block kit. Im tempted to try make a base gasket out of 1.2mm gasket paper instead of 0.6mm that came with the kit.

Might fuck with port timing a bit

but better than blowing it up 

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What's the stroke on that beast? Last I heard from 'my' engine guy was not to be afraid of moving the barrel a little when dialing combustion chamber in.

Jennings reckons 0.4ish mm minimum squish, 1.5mm max. Seems like a lot of leeway

Any signs underneath the piston crown? 

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2 steps forward one step back it seems. 

Swapped base gasket out to 1 I barry’d up with a ball peen hamer out of 1.2mm gasket paper. Success as can now run 1 headgasket and head with untouched squish band without piston touching the head issues. 

Got excited for a test nang but now its running like shit and wont idle/lazy to rev. Spark plug is super wet almost dripping with fuel now.

Gave up for the day and will check the carb tomorrow/drop a jet size

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Oh lols. The needle had popped the clip up when I put the carb back together earlier so it was just jumping round doing its own thing.

Got it sorted and happy idle/shed nangs again. Seems alot more rev happy now too. Will wait for daylight tomorrow for more test n tune

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Just ordered a 13T sprocket from the UK to try get a bit more top speed without too much torque loss that I got from the 15T one and another Giannelli spanny/muffler combo to suit a TS50 instead of the TS80 one im currently running. It will be interesting to see how the power band changes. I slapped the factory exhaust back on for lols and it makes the bike so lazy, no noticeable powerband just quiet nangs 

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More tutu'ing and getting better results. Whipped the head off to check squish clearance after everthing had settled, piston crown still had the faintest mark on the back edge where its just contacting when things expand. Very cautious grind with the die grinder to fix the touching and slapped it back together. 

Went up to a 120mj jet again an dropped to a 48 pilot which is seems very happy with, enough torque to hold 4th up most hills if I keep it on pipe and the high rev off idle cutout/splutter has gone with the smaller pilot jet. Just went for a happy backroad nang and it will rev right out to the top of 5th on the flat now which is about 78-80ks at 10k RPM.

 

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