b40rt

Throttle cable pulled out twist grip or carb ?

Assuming its an amal ? Screw nearest engine is the mixture screw, in for richer. This screw is very sensitive, so make very small adjustments at a time, and only once engine is warm. Screw behind it is tickover, in faster.

NGK BP5ES

Normal unleaded is fine. Have you tried a new plug ? When you tickling it, don't go crazy, slightly flood it only. If the plugs wet, dry it, heat it and try again. To start it ease it over compression on the firing stroke, then give it a long push, rather than a kick.

If your seriously interested in these bikes the following book is probably the best http://www.ratiopublishing.co.uk

You said you had boyer ignition ? Sounds like a standard set up to me. Black things a rectifier, blue a condenser.

For the purposes of getting it started any petrol will do, for longer term running and piece of mind castrol do an octane boost / lead replacement . https://www.ebay.co.uk/itm/CASTROL-VALVEMASTER-LEAD-REPLACEMENT-PETROL-ADDITIVE-OCTANE-BOOST-DA6267/323238330293?ul_ref=http://rover.ebay.com/rover/1/710-53481-19255-0/1?ff3=2andpub=5575376664andtoolid=10001andcampid=5338268676andcustomid=9b232b89-2caa-430a-b189-660203316fd0andlgeo=1anditem=323238330293andsrcrot=710-53481-19255-0andrvr_id=1852669596561andrvr_ts=d672addd1680aad98dc1ebdcfff315a8andul_noapp=trueandpageci=cae57e3d-7ab6-4a3f-a927-e9aa0c38acb2andredirect=mobile

Petrol

@tshock250 Good things come to those that wait 😃

Unless there is more than one fly wheel. M35 x 1.5 right is correct. https://www.ebay.co.uk/itm/FLYWHEEL-PULLER-M35-x-1-5-RH-HUSQVARNA-610-ROTAX-250-350-500/263017909599?hash=item3d3d16cd5f:g:LLcAAOSwQz1bGUQyandredirect=mobile

Steam clean.

You sure you need seals ? Does it run very weak / erratic, dry side seal. Burns gear oil which generally looks different to 2stroke smoke ? Other side. Not just the exhaust needing a good clean out ?

TXR engine is good, its the climber primary that's higher.