From 107 to 128

[sirch345]

You're getting there, well done

Thanks for posting the good quality photo's, it's all looking nice and clean

Chris.

[freeridenick]

Thanks for posting the good quality photo's, it's all looking nice and clean

Chris.

Thanks Chris. I bought one of the small bench-top parts washers. It's a bit small for the cases but with a bit of twisting and turning I could get everywhere. It wouldn't grace the pages of Practical Sports Bikes though.

[Chippieminton]

More cursing and removal of parts followed by refitting and finally getting it all together.

Front and rear pistions




Dinky flywheel


Pain in the butt clutch etc

Phwoarr!!!

[fabiostar]

are running without the quieting gear on the clutch basket nick? i ended up removing mine and cant say it sounds any louder than it was.

[freeridenick]

are running without the quieting gear on the clutch basket nick? i ended up removing mine and cant say it sounds any louder than it was.

Yeah I took it off for 'weight saving'. Although I could probably save more weight by having a big dump. It's also a bit of a pain aligning the gears.

[sirch345]

Thanks for posting the good quality photo's, it's all looking nice and clean

Chris.

Thanks Chris. I bought one of the small bench-top parts washers. It's a bit small for the cases but with a bit of twisting and turning I could get everywhere. It wouldn't grace the pages of Practical Sports Bikes though.

It certainly looks like the parts cleaner was worth getting Nick

[fabiostar]

are running without the quieting gear on the clutch basket nick? i ended up removing mine and cant say it sounds any louder than it was.

Yeah I took it off for 'weight saving'. Although I could probably save more weight by having a big dump. It's also a bit of a pain aligning the gears.

the pain in the butt was my reason for binning it still in that area of the engine, the clutch basket i fitted i also removed all the casting marks on the outer basket on the wee lathe.. not in any stress areas i may add but as standard i checked both mine and you wouldnt believe how much run out they have as standard, as tescos say every little helps

[freeridenick]

Heads off to have the valve seats re-cut for these babies. After that it's another clean and everything goes back together for the cams to be timed. Assuming I don't go nuts and have the heads skimmed as well.

[fabiostar]

Heads off to have the valve seats re-cut for these babies. After that it's another clean and everything goes back together for the cams to be timed. Assuming I don't go nuts and have the heads skimmed as well.

oooh very nice i have to say.. on the heads thing i seem to remember in the back of my tiny head somebody saying about skimming the block instead of the heads??

[Stephan]

What would be the reason for skimming head or block? Other than CR which is served already by pistons.

[tony.mon]

Not directly applicable, but I found that running JE's with an ignition advancer I had to run 98 RON to keep it from pinking when thrashed.
You might end up with the same result if running hi comps with a skimmed head or blocks, even without an advancer.

You certainly won't NEED to skim the heads; it's not like a four cylinder head where you can get twisting along the axis. There's enough metal on these that they stay flat.

However there's enough clearance between valves and pistons using std cams to do this, but if you do skim as well, I'd suggest that you carefully measure clearances by dry building the engine (using the old head gaskets to get the right clearances) and checking that you have enough clearance with your cams at all degrees of rotation on the intake/exhaust stroke.

[freeridenick]

What would be the reason for skimming head or block? Other than CR which is served already by pistons.

The reason is simlpy pushing the CR out to the maximum. But you're right to question it. When I dropped the heads off they asked me if I wanted them skimmed too. I haven't done a squish check so I said no but it got me thinking whether it's worth it. My decision is no. But I'll still check the squish when it's all back together.

[Stephan]

question is, if you want to push CR that far. JE pistons are enough even for stage 2, and power gain is very small. Look what CR is running high powered SP engine, hidden treasure is not in CR You would be asking for troubles rather than power.

[sirch345]

I agree, leave the compression ratio as it is, otherwise the bottom end will be saying enough is enough
You're already up to 11.5:1 which is a big increase as it is,

Chris.

[tony.mon]

I agree, leave the compression ratio as it is, otherwise the bottom end will be saying enough is enough
You're already up to 11.5:1 which is a big increase as it is,

Chris.

I think the bottom end is fine; you won't be getting to the point where you start thinking about a welded crank with the mods you have in mind.