Search found 615 matches

by vma500
Tue May 02, 2023 12:31 pm
Forum: Engines
Topic: Pistons. Yes that old chestnut
Replies: 6
Views: 2345

Re: Pistons. Yes that old chestnut

Pistons with Windows need richer jetting and richer jetting needs more ignition advance , it makes sence now ?

Tzrs with no Windows are perfect since the ignition is all same for all the 4 pots
by vma500
Mon Jun 27, 2022 1:36 pm
Forum: Custom Projects/Restoration
Topic: Ducati dry clutch conversion for RZ500
Replies: 4
Views: 1448

Re: Ducati dry clutch conversion for RZ500

Well said , better buy another bike for ur collection then to destroy an iconic motor like the rz/rd I ve seen many projects like the one of ur Dreams, never was it reliable or fun to drive , 100 hp is a realistic number for this bike . Enjoy now it still is possible , the electric era is coming soo...
by vma500
Fri Jun 17, 2022 6:26 am
Forum: Custom Projects/Restoration
Topic: Ducati dry clutch conversion for RZ500
Replies: 4
Views: 1448

Re: Ducati dry clutch conversion for RZ500

Don t ,..overbore the rz barrels more then 2 mm ,the pvs need to be altered also
by vma500
Mon Jun 06, 2022 11:15 am
Forum: Ebay Alert
Topic: Bimota engine
Replies: 1
Views: 686

Bimota engine

by vma500
Sat Jan 30, 2021 1:16 pm
Forum: Engines
Topic: Power valves replacement
Replies: 4
Views: 1288

Re: Power valves replacement

Hi am sure the tzr 250 1kt/2ma fit the lower bank ,small modification on the left pv needed

But i think they re harder to find also
by vma500
Sat Jan 30, 2021 1:12 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

Couple of questions on the "offset theories". Firstly, why does it affect port timing when this is controlled by each piston going up and down its respective barrel and the inlet arrangements are different between the banks anyway. Secondly, my cranks have both been rebuilt using pattern ...
by vma500
Thu Jan 28, 2021 7:10 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

Does a crankshaft from a 500 have the same balance factor as a crank from tzr250? The balance shaft has 2 weights perpendicular, 90 degrees to the crank its geared to, its only correcting 1 crank not the pair together. Is that correct? In my earlier post I said I want to change from 180 firing orde...
by vma500
Thu Jan 28, 2021 6:18 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

There s a misunderstanding ,there s crankangle (as a whole)and there s cylinderangle ,in the ideal world these should be in phase ...Wright? Most of us asume , there went something wrong in the multiple gearing ?or the 2 axisses crank vs cilinder angle are out of phase ? But wich one is out? For a r...
by vma500
Wed Jan 27, 2021 1:53 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

With the offset key ,ignitiontiming and porttiming is corrected and opposing rotating force from the cranks reduced.
The heat in the rear bank is lower as are the vibrations
by vma500
Wed Jan 27, 2021 1:25 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

The rear crank has a delay ,but comes to tdc when the lower crank is already doing it s downstroke ,this results in more advance in ignitiontiming on the rear barrels because the ignition is already happened on the front crank and Fired all the coils same time (wasted spark) So if the advance is 26°...
by vma500
Wed Jan 27, 2021 10:57 am
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

Yes,cranks need to hit tdc at the same time
by vma500
Tue Jan 26, 2021 4:18 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

Yeah Bill ,am on ur side about the cranktiming ,just wonder why Lance is nt ,you can see with the bare eye there s an issue Porttiming is out of sync ,dito for the ignitiontiming But i did nt find where the problem comes from ,crankcases?crankgears? Did u find this in every engine?or only the early ...
by vma500
Tue Jan 26, 2021 7:25 am
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

I see the rd500 engine as an tandem parallel twin not as a v engine dito for the rg500 ,both has firing order 180°

The rd500 has 50° lay-out, it does nt matter much if you change it to 52,5°
I think Lance was Wright about the lay-out coz he considder the rd500 being a v engine
by vma500
Wed Jan 06, 2021 4:33 pm
Forum: Engines
Topic: Rear Crank Timing out 2.5 Degrees
Replies: 70
Views: 10449

Re: Rear Crank Timing out 2.5 Degrees

As Bill said , mechanically correction needed !
by vma500
Sun Oct 25, 2020 6:48 am
Forum: Engines
Topic: Anyone tried the new 28mm Smartcarbs Yet ?
Replies: 13
Views: 2169

Re: Anyone tried the new 28mm Smartcarbs Yet ?

Thanks for the head ups on efi Martin

I run powerjets on almost every bike now ,don t understand the people that disconnect the solenoids for extra fine tuning ,they run cleaner and better with them ,The air jet influences the largest area from the carb