Tomos BT90 project

[Marv]

We only have the AT, ATX, and NTX versions over here.

[2pac]

We dont have BT here the only motorcycle tomos in the netherlands was the tomos ts50 with top speed of 85/kmh

Ive buy it on something like ebay in your country

[jordy1993t]

Wauw very nice i look it very much! How is the project going right now?

[pomartin]

im still waiting for crankshaft...

[pomartin]

update
i got crankshafts, some stickers and outside part of engine is half way pollished.
at the moment i do not have time for this... we got final exams in school and it ends 6.9.... so till then, this would be it

[Alex..]

looks great Pomartin, id like to see it when its finished,

ps; Could you inform about Ales, i havent heard from him since friday when he would sent me pictures, he was supposed to send all the parts tomorrow but i havent heard anything yet

[pomartin]

update




more pictures and head tunning when i get new "small bearing" for crankshaft

@Alex... i will contact him

[Alex..]

looks real nice again Pomartin,

what cylinderhead do you use?

and ales has some problems with internet he said, so he responds very late or something,

so i guess its fine

[pomartin]

cylinderhead is from Tomos CTX. it is good, becouse it has almost excellent squish, but i still need to make some measurements

[pomartin]

cap for intake was made... still need to drill holes and polish it.
also found material for flange- inside fi 29

[2pac]

realy nice

I have some question

I wanna give my bt engine more compression
i have a Bt cilinder High pressure cilinderhead and another exhaust 18mm intake and dellorthe 19mm carburater

Ive heard that there are 2 holes in the carter where your crankshaft is
if i fill them it have more compression

Can you confirm that?

And is there any limiter in the exhaust i have a NTX exhaust something like on a CTX


II hope you will help me

[pomartin]

you can fill those holes in crankshaft with cork... it have some effect, and if something happens, cork is soft and it cannot do any dammage
it wont lift your compression, but performances will be better.
the only thing you can do for better compression is lowering cilinderhead
ctx exhaust has limiter. inside is a longer tube, wich disable resonant effect... and it have metal grid allover the exhaust

[2pac]

Oke thankx

No not the holes in the crankshaft
but in the room where the cranckshaft is are 2 holes that are 5mm ore something they say to my

[pomartin]

yes... you can fill them too.. make a thread and put in a screw. i recommend that you use metal glue too

[2pac]

Oke realy thanx for you answer

[pomartin]

no problem

[2pac]

Now i have some work

Did it make alot of difference to fill that holes?

[pomartin]

it depends on all other tunning... but it is positive difference for shore

[Alex..]

and Pomartin, do you know which piston you need for AT/BT/NTX Cylinder ?

[pomartin]

well it depends on what fi of cilinder do you have...
if you want to know which mark... there are a lots of marks of pistons for tomos... i use vertex or meteor, könig is also very good , i strongly reccomend that you do NOT use sukoki... it is very bad quality and toleranced for watercooled engines...