Ciao io non uso motori a benzina, però girovagando in internet mi ricordavo di aver letto questo, vedi tu se è il tuo caso
"Ignition types that have been in use:
ICU ignitions (latest, By MSR) , with automatic advance. The ignitions need LiPo 2S (L- and S versions) and 3S (P-version and twin engines) for power, they have safe start, shut off at reverse running. The L-S-P ignitions can be programmed for canister exhausts (short muffler) or tuned pipe (long muffler) and have the possibility to drive an automatich choke servo (S-P type only).
Beware:
the L- and S- ignitions are constructed for use of 2S-LiPo pack without regulator, and cease to operate at 6.5 Volts or lower. On the upper voltage end the ignitions can handle the 3cell A123 voltage.
The P-version needs 9.5V -14.4V(3S LiPo cells); 4x A123 is the upper voltage limit
Faulty operation has been reported when using JR power switches. The femal JR pin receptacles are too wide and do not provide proper contact. Bending the connector pins of the MSR unit can provide a (temporary) solution. Be sure to use all 100% secure contacts in your wiring harness. Loose fitting plugs are an indication of unreliable contacts and failing contacts if your engine has seen some running.
Downloads: Manual ICU V1.5 or MVVS third generation ICU /S - /P ignition V2.0
Many "failures" have been reported, because the plug cap was not pushed down completely. When pushing the cap down, use much pressure and a slight twisting motion. "
ecco il link, vai in "petrol engine" sul menù di sinistra.
MVVS model engines main page