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cz511atk604 Added a reply to Building the ultimate cr125 engine
1/10/2025 6:43am The 2nd eng package 98 it's all there, order the billet exhaust flange and Euro Messico Pipe/Silencer There's your Power house, I like 6 gears,V force intake ,Power Now wing and lite weight alum friction plates. Electric water pump,vortex igniter adj mapping , Hot Wire spark wire ,38 mm Kehein pkw /stic carb ,Carrillo rod & stroked balanced crank,2 mm...
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cz511atk604 Added a reply to Building the ultimate cr125 engine
1/8/2025 3:29am MIss & a Hit Thousand s of cyl & heads 2 yrs In R&D testing the Newly designed Honda cr125 engine package slated for production 1/2 years qthe Japanese 125 2 stroke Engineer's working 3 Shifts 24 hrs a day along side a wall of workers grinding on blank cylinders Strict Deadlines are followed Decisions & choices finalized on no...
Roberdj3 Liked a reply to forum topic Building the ultimate cr125 engine
1/7/2025 10:25pm
The 1992 barrel had the most aggressive porting so id start with that. 1998 power valves had a better sealing design. Very hard to get though. Messico or spes exhaust makes a massive difference. There is a European guy called Nino who has tested every single pipe and he recommends messico as the best. He also bores the carb out the 38mm.and puts a stronger power valve spring in to compensate for the bigger carb delaying the power higher in the revs. 1997 ignition has the most advance curve And gives the bike more snap.
This forum topic has 71 replies.
cz511atk604
Added bike check Pro Circuit CR125r
12/21/2024 8:53am
mark911 Liked a reply to forum topic Building the ultimate cr125 engine
12/21/2024 8:44am
Nobody really knows how a two stroke works (the multi physics from air box to exhaust tip). Even the most sophisticated finite element multi-physics simulation programs can't even figure it out, otherwise, everyone would be making similar numbers. The real trend setters (in motoGP) spent literally thousands of hours experimenting with different theories going through hundred of cylinders/heads, fuel systems, exhaust, resonating air boxes, and all sorts of crazy ideas just to gain a few tens of a HP (at 15-19,000 rpm) and it's always a compromise. You rarely, if ever, gain across the board. And these were guys that...
This forum topic has 71 replies.
cz511atk604 Added a comment about bike check Kx 500 2001
7/1/2022 1:24am
I shipped the 89 250 tank, shrouds,ims tank,etc,flex bar set,gafer rear rotor,skid plate,geez fmf silencer,sold parts & bike in 2018. Thanks stock tank was brutal,these 89 kx250s bolted up direct fit kx500 90-end of production
This bike check has 2 comments.
cz511atk604
Added bike check 1978 CZ 125 MX model 511 516
6/16/2022 9:25am
cz511atk604
Added bike check Kx 500 2001
6/16/2022 9:24am
cz511atk604 Added a reply to Building the ultimate cr125 engine
6/14/2022 10:16pm Tassari reed block,pro cir porting & head ,jd jet kit& dial a jet kit,pro cir pipe & shorty sil,gearing ,race gas,hpp 32.1, German piston kit every 7 hrs,hold it wide open ! Oh add 2 mm header flange
cz511atk604
Added bike check 99 & 00 ATK 604 ds
6/14/2022 8:04pm
