Everyone�s considerations are different but if spending money wisely is one of your aims I think the math (as our American cousins would say) is possibly with the Iame. Although I do agree with the above about getting a quote to service and seal your existing comer engines before you do anything else. My guess is it�ll be around �250 each i.e. the basic service price each with normal service parts. However, if they do find something, once �opened up� it could be considerably more. Once sealed unless they have proven �history� or show especially well on the dyno, they�ll be worth about �250- �300 each, OK maybe �350 each because they�ve just been serviced! However they�re probably worth �150-�200 now unsealed.
Honda, again is a class in flux, again look how cheaply you can buy supposedly front running T1 engines, again because the newer T2 engine has just been launched and early evidence is that it will be better. Then you have the additional randomising factor of the new restrictor rules. Anyway the additional factor is that you�d need to sell your existing chassis if you choose to switch to the Honda.
So the other budget option is sell your existing engines, unsealed, put this money and the money you�d have spent getting them serviced and sealed (total probably around (�900) towards the �1000 purchase price of one Iame engine. It�ll be OK straight out of the box and after it�s first service, fiche and a few hours it�s performance will plateau at around the same as everyone else�s.
I think you also need to talk to the people running and tuning the Iame�s. All will tell you how well made and over engineered these engines are. The easykart guys, who have most experience, are only allowed to run one engine and most recon on getting a full season between service/rebuilds and don�t seem to have a problem with the one engine rule. So you could conceivably get by with just one engine, for now. People who have tested/dyno�d a few will tell you how consistent the figures are, even those who have tried switching carb�s, exhausts etc. report very little variation. The general consensus is that after the first 10 or so hours and first service, they�re good for about 20+ hours between rebuilds and remain very consistent through this period, basically they don�t come-on and drop-off to the same extent as the Comer, so again having multiple engines is less important.
I�d recommend you speak to someone like John at Force, he has a long history of working with the Comer but has also sold/serviced a fair few of the new Iame engines, so would be well positioned to give you a balanced unbiased view of the relative merits.
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