Search found 20 matches

by David de Botton
Thu Feb 08, 2018 6:49 am
Forum: Engines
Topic: Individual / single heads from another Yamaha
Replies: 74
Views: 9523

Re: Individual / single heads from another Yamaha

Jeff 10 - very kind of you,,,much appreciated

No doubt it will take some time to organise all 4 heads

Cheers
by David de Botton
Wed Feb 07, 2018 5:24 pm
Forum: Engines
Topic: Shell-95 & 98-Correct Combustion chamber volume for pump Gas
Replies: 2
Views: 846

Shell-95 & 98-Correct Combustion chamber volume for pump Gas

Q#1 - The correct combustion chamber volume for 95 octane is ?
Q#2 - The correct combustion chamber volume for 98 octane is ?
by David de Botton
Wed Feb 07, 2018 5:18 pm
Forum: Engines
Topic: Individual / single heads from another Yamaha
Replies: 74
Views: 9523

Re: Individual / single heads from another Yamaha

Jeff 10 --- thank you...soon as I have 4 heads I intend to align all bores to heads then do the Squish clearances
by David de Botton
Tue Feb 06, 2018 9:00 pm
Forum: Engines
Topic: Individual / single heads from another Yamaha
Replies: 74
Views: 9523

Re: Individual / single heads from another Yamaha

What other heads can be used as an individual cylinder head. YZ125 TZR250 ? Stud pattern looks the same Cheers I believe the TZR250 3XV SP ones will work but there is a little work to be done on the waterways. But good luck in finding a full set of 4 as i have been looking for a while! Thanks Ade I...
by David de Botton
Fri Jan 26, 2018 10:24 pm
Forum: Engines
Topic: Individual / single heads from another Yamaha
Replies: 74
Views: 9523

Re: Individual / single heads from another Yamaha

YZ heads have an oring. Ease of servicing. No gasket issues
by David de Botton
Mon Dec 11, 2017 6:56 am
Forum: Engines
Topic: Individual / single heads from another Yamaha
Replies: 74
Views: 9523

Individual / single heads from another Yamaha

What other heads can be used as an individual cylinder head.
YZ125
TZR250 ?
Stud pattern looks the same

Cheers
by David de Botton
Mon Dec 11, 2017 6:45 am
Forum: Engines
Topic: Crankshaft assemblies
Replies: 122
Views: 21143

Re: Crankshaft assemblies

David, they are about done they will cost 449.00 USD front or rear, I have 200 sets being made, no one has bought any so not sold out, I include a complete seal kit which is the 3 seals and 2 plugs with a set purchased Thx Moderator I will be on holidays until the 8th of January Whats the preferred...
by David de Botton
Sat Dec 09, 2017 6:54 pm
Forum: Engines
Topic: Crankshaft assemblies
Replies: 122
Views: 21143

Re: Crankshaft assemblies

I will purchase two complete crankshafts - ARE THESE CRANKS STILL AVAILABLE ???... $$??
by David de Botton
Sat Dec 09, 2017 6:51 pm
Forum: Engines
Topic: Need better porting "specifications" increase in mid range?
Replies: 0
Views: 1045

Need better porting "specifications" increase in mid range?

Can anyone help with details on

#01 - port specs - standard
#02 - port specs - mid range
#03 - port specs - top end

#04 - combustion chamber volume - standard
- combustion chamber volume - modified
#05 - squish clearance
by David de Botton
Sat Dec 09, 2017 6:44 pm
Forum: Engines
Topic: Stock power valves ( reproductions).
Replies: 5
Views: 1490

Re: Stock power valves ( reproductions).

By chance...does anyone know if the 500 P. Valves are interchangeable with RZ350 power valves?, as billet power valves are avsil easily for that motor. I'm sure it's not that easy...but no harm in asking The RZ250 power valves look the same at a glance... Would need to fit some to be sure To be hon...
by David de Botton
Wed Nov 09, 2016 4:48 am
Forum: Engines
Topic: RZ500 Performance pipes
Replies: 12
Views: 6315

Re: RZ500 Performance pipes

ok guys....I hear it load and clear :-)
by David de Botton
Sun Nov 06, 2016 3:18 am
Forum: Engines
Topic: RZ500 Performance pipes
Replies: 12
Views: 6315

Re: RZ500 Performance pipes

Has anyone tried the Original Yamaha TSI Spec exhaust pipes?? ( specs sheet posted here on the forum ) With the other modifications included...a 30% increase on power through the range is AWESOME. I am seriously considering getting a set made....Just wondering who has thgese pipes on their bike NOW ??
by David de Botton
Sun Nov 06, 2016 3:15 am
Forum: Engines
Topic: RZ500 Performance pipes
Replies: 12
Views: 6315

Re: RZ500 Performance pipes

As an apprentice bike mechanic, it was common just to burn out the muffler & scrape out the ehader as best you can. Years later I owned my own workshop An aircraft mechanic came in an saw all the RZ 500 pipes hanging up. He walked over and picked one up & commented on how heavy the pipe was....
by David de Botton
Sun Nov 06, 2016 3:02 am
Forum: Engines
Topic: Yamaha Balancer Mod Tech Papers
Replies: 38
Views: 34727

Re: Yamaha Balancer Mod Tech Papers

after all these years you would think this is finally sorted.....hhmm