All things said and done, it appears you should consider sending your engine to an expert. Unfortunately, I think Gerard is out of business and Dave Patrick is on record not accepting Mokis for service (even though the Moki manufacturer said they would.) Try contacting Horizon Hobby and see if they can recommend a repair shop and/or Morris Hobbies. Both Dave Patric and Morris Hobbies now sell Mokis under different brands. Morris' brand is Mark and Dave Patrick is DPM. Dave Patrick even sells a version of the 180 and 210 with high-compression heads (blue head) for use with a higher-level of nitro.