''Really enjoyed your website''
''I have a TZR125R/4DL Y-1 3MB-P-00 top end , 134cc, with slightly larger port volume and appropriate port timing with 0.6mm, squish' cylinder head I'm testing.
The compression ratio slightly reduced.''
That is a interesting setup.
0,6mm squish that is pretty tight, going to race specifications.
''I need to tune the ignition and Powervalve timing. I have started with a basic map similar to that of a 4DL and can support there being a potential 2hp increase''
Ok that is positive, small step towards more
''I'm moving on to fitting a TM34ss with WR200 inlet manifold (slightly longer inlet tract) and VFORCE3 Reed block, However I can't isolate better running over a 4DL reed cage''
Have good results by enlarging the crank case volume a bid so don't thing the longer manifold will be a problem.
34mm carb, that would be the max I think regarding the inlet volume from the reedblock?
I have always believed that the 4DL Y-1/Y-3 was only good for 22-23bhp in stock configuration?
Don't know way you guys are all so low on the HP outcome.
In Germany they had to bring back the power to 15HP if a younster (16) want to drive it on the road (drosselt)
They did this by letting the exhaust valve closed, or mound it in restricted mode or by gearing or black box.
''I have yet to sort out my Dyno run, but I still don't believe it will be making an extra 6hp around 11,000 or so. But I would hope that is possible''
It will be strange if it won't!!!.
How much do you have right now?
What exhaust do you use, and where does that exhaust peek.10500rpm?
''What are your experiences with altering squish height with a 4DL? very interested to gain some insight''
Currently non, I want to change it in the future.
But for now like to see ho far I can go with a relative stock setting
''The design for the RR' Airbox is interesting, I am struggling to modify and work out a good increase in Air volume for this engine''
Yes the RR airbox is relative larger than the R airbox.
I'm running the rr airbox without airfilter and snorkels currently.
Mus say until now it works fine like this