I have a brand new sachs around the 70cc mark.

What actually is it? 70cc, 72cc, Not sure

And how do these engines compare in power to similar out there?

I just want to be confident in fitting it to a new model

Cheers all

Look at the front of the cylinder flange and see what numbers are there.They should be like 47NG,48ZG,51 or 52 plus a number or 2.These are the cylinder bore in MM"S.I have a sachs that has 47 so its 61cc.I have one that has 48NG,so its 62cc.If yours is a 70ish,i would say you should have a 52 with a couple letters after it.It should be about 72ccs.I have a A&M sachs engine with 44ZN wich means its a 52cc.
I have not run my 52 since i rebuilt it with my new tach but i was told by a very good and trusted source mine will run very close to a G62.Right now with ign RTF with out the battery and prop it weighs 4 lbs.

i know that most of the brison engine are based on the sachs - dolmar-makita
check kange to see a similar brison there

70cc would be a Sachs 4.2 probably, depending on who made the engine it will be a very powerful and dependable engine. Check the end of the crankshaft for a dimple. A dimple means it is a Sachs crank and will be a very good engine. No dimple means it is not so good but may still be useable. Power wise my 4.2 is very comparable to a 3w 75.

Larry

Brison bought out a an M sachs back in 93 or 94. The old A&M sachs use to like to go through the bearings and their cranks really don''t like ground strikes. but they are very powerful and should compete with any of the 70cc engines out there today

Ya got that right about the cranks.My A&M,2 of them now,i bought cheap because the lower rod bearing went out.Both of the ones i bought didnt have the dimple in them so they where A&M"S own make.I simply bought a used sachs model 115 chainsaw crank and rod and exchanged them right out no problem.My second one i have has the same thing so im just waiting for the right parts to show up at auction again.The first one,case,crank,and rod only was $29.00 plus shipping.

Just doing the final fitting of the engine now but have realised that I have 2 prop drive bolts missing. Anyone know what thread they are?